CN114674217B - Two-dimensional material strain testing device and method based on piezoelectric ceramics - Google Patents
Two-dimensional material strain testing device and method based on piezoelectric ceramics Download PDFInfo
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Abstract
The invention provides a two-dimensional material strain testing device and a two-dimensional material strain testing method based on piezoelectric ceramics. The measuring device is a flexible strain sensor; the fastening device comprises two clamping devices and a flexible substrate, the two clamping devices and the flexible substrate are vertically stacked and do not contact with each other, and two ends of the flexible substrate are respectively clamped by the two clamping devices; the driving device comprises first piezoelectric ceramics, second piezoelectric ceramics, first structural members and second structural members, the two first structural members are respectively positioned at two sides of the fastening device and fixed in position, and two sides of the second structural member are respectively connected with the first structural members through the second piezoelectric ceramics; the two first piezoelectric ceramics are respectively arranged between the two first structural members and the two clamping devices; the power box is used for supplying power for the driving device and the measuring device respectively. The device and the method can be used for carrying out repeated tests on the same sample, the tests are controllable and reversible, the result precision is high, and the experimental requirements under various environments such as room temperature, low temperature, magnetic field and the like can be met.
Description
Technical Field
The invention relates to the technical field of strain measurement, in particular to a strain testing device and method for regulating and controlling optical performance of a two-dimensional material based on piezoelectric ceramics.
Background
Piezoelectric ceramics are a general name of ferroelectric ceramics which are prepared by mixing oxides (zirconia, lead oxide, titanium oxide, etc.) and sintering the mixed oxides at a high temperature and carrying out solid-phase reaction and have piezoelectric effect through direct-current high-voltage polarization treatment, and are functional ceramic materials capable of mutually converting mechanical energy and electric energy. The piezoelectric ceramic has the property of spontaneous polarization, and the spontaneous polarization can be transformed under the action of an external electric field. Therefore, when an external electric field is applied to a dielectric having piezoelectricity, the piezoelectric ceramic is deformed. However, the piezoelectric ceramic is deformed because the polarization intensity is enhanced when the same external electric field as the spontaneous polarization is applied. The increase in the polarization causes the piezoelectric ceramic sheet to elongate in the polarization direction. Conversely, if a reverse electric field is applied, the ceramic sheet shortens in the direction of polarization. This phenomenon, which is converted into a mechanical effect due to an electrical effect, is an inverse piezoelectric effect. The piezoelectric ceramic has small deformation amount under the action of an electric field, the deformation amount does not exceed one million of the size of the piezoelectric ceramic at most, and the piezoelectric ceramic has the advantages of good frequency stability, high precision, wide applicable frequency range and the like.
The full name of the two-dimensional material is two-dimensional atomic crystal material, which is proposed along with graphene, such as nano-film, superlattice, quantum well, etc. Two-dimensional materials are confined to two-dimensional planes due to their carrier transport and thermal diffusion, making such materials exhibit many unique properties. The adjustable band gap characteristic of the band gap is widely applied in the fields of field effect tubes, photoelectric devices, thermoelectric devices and the like; the controllability of the spin degree of freedom and the valley degree of freedom thereof has led to intensive research in the fields of spintronics and valley electronics; due to the special properties of the crystal structure, different two-dimensional materials have anisotropy of different electrical properties or optical properties, including anisotropy of properties such as Raman spectrum, PL spectrum, second harmonic spectrum, light absorption spectrum, thermal conductivity and electric conductivity, and have great development potential in the fields of polarized photoelectric devices, polarized thermoelectric devices, bionic devices, polarized light detection and the like.
The distance between the atoms of a material changes when the material is stretched or compressed, and the distance affects the electronic properties of the material, which has been used in semiconductor processing for many years. The crystals may withstand a tensile strain of 1% before breaking, whereas the two-dimensional material may withstand a strain of 10% to 20%, and thus the strain provides greater potential for the two-dimensional material. The electronic properties of two-dimensional materials depend on the deformations and mechanical stresses present in the material, which can be completely altered by their influence. These particularities of two-dimensional materials have led to new directions for fundamental physics and also have created opportunities for applications in which two-dimensional materials are studied at high strain levels.
The method for applying the tensile strain to the two-dimensional material in the bending and folding modes only can act on the local part of a test sample, the test points before and after the strain are difficult to accurately position, the bending strain is also obtained by calculating an angle value, the precision of the test result is not high, the time consumption is long, the folding strain is irreversible, and the same test sample cannot be tested repeatedly. Therefore, there is a need to develop a simple and controllable two-dimensional material strain test method.
Disclosure of Invention
Aiming at the defects of the existing two-dimensional material strain testing mode, the invention provides a two-dimensional material strain testing device based on piezoelectric ceramics, which applies tensile deformation to a two-dimensional material by utilizing the electrostrictive compression or extension property of the piezoelectric ceramics, can enable the generated deformation to be uniformly distributed on the two-dimensional material, overcomes the problems that the position of applying tensile strain to the two-dimensional material in a folding mode is uncertain, the strain is not uniform, the test point is difficult to position, and a test sample cannot be recycled, improves the precision and the convenience of strain testing, improves the reusability of an experimental material, and expands the testing environment of the testing device.
The invention adopts the following technical scheme:
a two-dimensional material strain testing device based on piezoelectric ceramics is characterized by comprising a fastening device, a driving device, a measuring device and a power box;
the measuring device is a flexible strain sensor, the fastening device comprises two clamping devices and a flexible substrate, the flexible substrate and the flexible strain sensor are arranged in an up-down stacked mode and are not in contact with each other, and two ends of the flexible substrate are respectively clamped by the two clamping devices;
the driving device comprises two first piezoelectric ceramics, two second piezoelectric ceramics, two first structural members and a second structural member, wherein the two first structural members are respectively positioned at two sides of the fastening device and are fixed in position, and two sides of the second structural member are respectively connected with the first structural members positioned at two sides through the second piezoelectric ceramics; the first structural members on two sides are connected with the clamping device through first piezoelectric ceramics respectively;
the power box supplies power for the driving device and the measuring device respectively, provides negative voltage for the first piezoelectric ceramics and provides positive voltage for the second piezoelectric ceramics.
Furthermore, the clamping device is a pair of blocks which are symmetrical left and right, two clamping pieces and a bolt, and the two clamping pieces are connected to the upper surface and the lower surface of the blocks through the bolt respectively.
Furthermore, the first piezoelectric ceramics, the first structural member and the clamping device, and the second piezoelectric ceramics, the first structural member and the second structural member are connected by welding or gluing.
Further, still include the LCD display screen, the LCD display screen sets up on the power supply box for show the strain value that flexible strain transducer surveyed.
Further, the voltage regulation range of the power supply box is-200V to 200V.
Further, the fastening device and the driving device are both made of non-ferromagnetic materials.
Furthermore, the second structural part is arranged on the power box and can be integrally separated from the power box, and the whole fastening device and the driving device except the second structural part are in a suspended state.
The two-dimensional material strain testing method based on the device is characterized by comprising the following steps: the method comprises the following steps:
step 1: placing a two-dimensional material sample to be tested on a flexible substrate, and clamping two ends of the flexible substrate and the two-dimensional material sample by a clamping device;
step 2: switching on a power supply to supply power to the flexible strain sensor, applying negative voltage to the first piezoelectric ceramic, applying positive voltage to the second piezoelectric ceramic, adjusting the magnitude of the applied voltage to enable the first piezoelectric ceramic to generate compression deformation and the second piezoelectric ceramic to generate stretching deformation, simultaneously stretching the two-dimensional material sample through the fastening device, synchronously generating uniaxial stretching strain through the flexible strain sensor, and reading out the real-time strain numerical value of the two-dimensional material sample on the LCD display screen;
and step 3: and (4) repeating the steps 1-2 again to perform the next group of tests after the voltage returns to zero.
Further, step 2 includes a step of subjecting the test apparatus to a low-temperature environment of 4K to 300K and/or a magnetic field environment before applying the voltage.
According to the two-dimensional material strain testing device based on piezoelectric ceramics, the power box is used for supplying power to the flexible strain sensor, meanwhile, the first piezoelectric ceramics are applied with negative voltage, and the second piezoelectric ceramics are applied with positive voltage. The four second piezoelectric ceramics extend along the axial direction under the action of the applied positive voltage, so that the first structural members exert an outward thrust force, and the two first structural members generate outward micro displacement. And the two first piezoelectric ceramics axially contract under the action of an external negative voltage, and two ends of each first piezoelectric ceramic are respectively connected with the first structural member and the clamping device, so that the two-dimensional material sample clamped by the clamping device and the flexible strain sensor are synchronously stretched, and the stretching deformation of the two-dimensional material is measured through the synchronous stretching process of the flexible strain sensor.
The invention adopts a uniaxial tensile strain mode, and avoids the defects that the action area of the strain modes such as bending and folding is small, and the test points before and after strain are difficult to accurately position. During testing, the flexible strain sensor and a test sample synchronously generate tensile strain, and the strain capacity of the sample can be measured in real time through the flexible strain sensor, so that the defects that the strain size is difficult to calculate and the precision of a test result is low are overcome. And by adjusting the applied voltage, the strain of the two groups of piezoelectric ceramics can be changed, and the tensile or compressive strain borne by the two-dimensional material sample and the flexible strain sensor can be synchronously changed, so that the whole experiment is in a controllable state.
Due to the fact that the polarities of the power supplies applied to the first piezoelectric ceramic and the second piezoelectric ceramic are opposite, the two-dimensional material is stretched by the sum of the deformation amounts of the first piezoelectric ceramic and the second piezoelectric ceramic. The arrangement can also increase the test range of the test device. After the test is finished, the external voltage of the two groups of piezoelectric ceramics returns to zero, the small deformation generated during the test disappears gradually, at the moment, the four second piezoelectric ceramics generate compression deformation, the two first piezoelectric ceramics generate tensile deformation, the two-dimensional material sample and the flexible strain sensor are synchronously applied with uniaxial compression strain, and the two are recovered to the strain state before the test, so that the whole test is in a reversible state, the repeated test on the same test sample is facilitated, the cost is saved, and the utilization rate of the material is improved.
The two-dimensional material sample and the flexible strain sensor are synchronously and outwards stretched by connecting the two first piezoelectric ceramics and the fastening device; simultaneously, the two first piezoelectric ceramics generate micro extrusion deformation under the action of an external negative electric field and are axially shortened, the positions of the two first structural members are unchanged, the two first structural members are simultaneously stretched through the fastening device and synchronously generate uniaxial stretching strain, and at the moment, the real-time numerical value of the strain of the two-dimensional material sample can be read on the LCD display screen. The two groups of piezoelectric ceramics apply uniaxial tensile strain to the two-dimensional material sample and the flexible strain sensor together, so that the strain range can be enlarged, and the device is suitable for the photoelectric property regulation and control test of the two-dimensional material under large strain.
The position of the first structural member for providing tensile force for the first piezoelectric ceramic is supported by the second piezoelectric ceramic and is not fixed and limited by other external structures, so that the measurement error caused by thermal expansion or thermal contraction of the first piezoelectric ceramic under different temperature working conditions can be overcome, and the piezoelectric ceramic can be applied to various different temperature fields such as high temperature, low temperature and the like, and even can be accurately measured in a low-temperature environment of 4K.
In addition, the device provided by the invention adopts a non-ferromagnetic material as a structural component, and the non-ferromagnetism of the piezoelectric ceramic and a structural component is utilized, so that the piezoelectric ceramic-based two-dimensional material strain testing device can be suitable for a strain regulation and control experiment of the optical performance of the two-dimensional material in a magnetic field environment.
Drawings
FIG. 1 is a schematic overall structure diagram of a two-dimensional piezoelectric ceramic-based material strain testing device according to the present invention;
FIG. 2 is a schematic view of the device with the second structural member and the power box removed;
FIG. 3 shows four sets of MoS after stretching as described in example 1 2 Strain Raman spectra of the samples.
The reference numerals are explained below:
1-a first piezoelectric ceramic; 2-a second piezoelectric ceramic; 3-a first structural member; 4-a second structural member; 5, a power box; 6-LCD display screen; 7-a square block; 8-bolt; 9-a clip; 10-a flexible substrate; 11-flexible strain sensor.
Detailed description of the invention
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example one
The invention relates to a two-dimensional material strain testing device based on piezoelectric ceramics, which comprises a fastening device, a driving device, a measuring device and a power box 5. The measuring device is a flexible strain sensor 11, the fastening device comprises two clamping devices and a flexible substrate 10, the flexible substrate 10 and the flexible strain sensor 11 are arranged in an up-down stacked mode and are not in contact with each other, and two ends of the flexible substrate and two ends of the flexible strain sensor are clamped by the two clamping devices respectively. In this embodiment, the clamping device is a pair of blocks 7 which are bilaterally symmetrical, two clamping pieces 9 and a bolt 8, and the two clamping pieces 9 are respectively connected to the upper and lower surfaces of the blocks 7 through the bolt 8; the flexible substrate 10 and the flexible strain sensor 11 are fixed to the block 7 by clips 9 and bolts 8, respectively. During testing, the clamping piece 9 and the bolt 8 which clamp the flexible substrate 10 are opened, the two-dimensional material is laid on the flexible substrate 10, and then the clamping piece 9 and the bolt 8 are installed to clamp the flexible substrate 10 and the two-dimensional material.
The driving device comprises two first piezoelectric ceramics 1, two second piezoelectric ceramics 2, two first structural components 3 and a second structural component 4, wherein the two first structural components 3 are respectively positioned at two sides of the fastening device and fixed in position, and two sides of the second structural component 4 are respectively connected with the first structural components 3 positioned at two sides through the second piezoelectric ceramics 2; the first structural members 3 on both sides are connected with the holding device by a first piezoelectric ceramic 1. The connection modes between the first piezoelectric ceramic 1 and the first structural member 3 and the clamping device, and between the second piezoelectric ceramic 2 and the first structural member 3 and the second structural member 4 are welding or gluing.
The power supply box 5 is used for supplying power for the driving device and the measuring device respectively, providing negative voltage for the first piezoelectric ceramics 1 and providing positive voltage for the second piezoelectric ceramics 2, and the voltage adjusting range is-200V to 200V. And an LCD display screen 6 is arranged on the power box 5 and used for displaying strain values measured by the flexible strain sensor 11. In this embodiment, the second structural member 4 is disposed on the power box 5 and can be integrally separated from the power box 5, and except for the second structural member 4, the whole fastening device and the driving device are all in a suspended state.
At the beginning of the test, the power supply box 5 supplies power to the flexible strain sensor 11, and simultaneously applies a negative voltage to the first piezoelectric ceramic 1 and a positive voltage to the second piezoelectric ceramic 2. The four second piezoelectric ceramics 2 are axially elongated under the action of the applied positive voltage, so that the first structural members 3 exert an outward thrust, and the two first structural members 3 generate outward micro displacement. And the two first piezoelectric ceramics 1 axially contract under the action of an external negative voltage, and two ends of the first piezoelectric ceramics 1 are respectively connected with the first structural member 3 and the clamping device, so that the two-dimensional material sample clamped by the clamping device and the flexible strain sensor 11 are synchronously stretched, and the stretching deformation of the two-dimensional material is measured through the synchronous stretching process of the flexible strain sensor. The amount of deformation measured by the flexible strain sensor 11 can be displayed on the LCD display screen 6 in real time. The polarities of the voltages applied by the two groups of piezoelectric ceramics are opposite, and the uniaxial tensile strain applied to the two-dimensional material sample is the sum of the deformation of the two piezoelectric ceramics, so that the strain range of the test can be enlarged, and the method is suitable for the photoelectric property regulation test of the two-dimensional material under large strain. Specifically, in the using process, the two-dimensional material strain testing device based on piezoelectric ceramics is placed in a Raman spectrometer, and after corresponding deformation is applied, the Raman spectrometer is directly used for carrying out Raman spectrum testing.
After the test is finished, the applied voltages of the two groups of piezoelectric ceramics return to zero, the small deformation amount is gradually recovered, and at the moment, the original lengths of the second piezoelectric ceramics 2 and the first piezoelectric ceramics 1 are recovered. Since the amount of tensile deformation of the two-dimensional material is within the elastic deformation range, the two-dimensional material will return to the original state when the second piezoelectric ceramic 2 and the first piezoelectric ceramic 1 return to the original lengths. If testing of other deformation quantity is required, the next set of testing can be performed by applying voltage to the second piezoelectric ceramics 2 and the first piezoelectric ceramics 1 again.
Furthermore, the piezoelectric ceramic-based two-dimensional material strain testing device adopts a non-ferromagnetic material as a structural component, and the non-ferromagnetism of the piezoelectric ceramic and a structural component is utilized, so that the piezoelectric ceramic-based two-dimensional material strain testing device can be suitable for a strain regulation experiment of the optical performance of the two-dimensional material in a magnetic field environment.
Specifically, the strain test device for the two-dimensional material based on the piezoelectric ceramics, provided by the invention, comprises the following steps of:
step 1: two-dimensional MoS to be tested 2 Transferring the sample to a flexible substrate PET, and mixing the flexible substrate PET and the two-dimensional MoS 2 The two ends of the sample are clamped by the clamping device；
Step 2: in a room temperature environment, selecting an environment without adding a magnetic field; switching on a power supply to supply power to the flexible strain sensor 11, applying negative voltage to the first piezoelectric ceramics 1, applying positive voltage to the second piezoelectric ceramics 2, adjusting the applied voltage to enable the first piezoelectric ceramics 1 to generate compression deformation and the second piezoelectric ceramics 2 to generate stretching deformation, and simultaneously stretching the two-dimensional MoS through the fastening device 2 The sample and the flexible strain sensor 11 synchronously generate uniaxial tensile strain, and real-time two-dimensional MoS is read on the LCD display screen 6 2 The value of the sample strain;
and step 3: by adjusting the voltage, moS is changed 2 The strain value of the sample, from 0% strain to 5% strain, step size 0.5%, and for MoS 2 Performing Raman spectrum test on the sample;
and 4, step 4: after the voltage returns to zero, the steps 1 to 4 can be repeated again to carry out the next group of tests
And 5: repeating the steps 1-4 twice to obtain three groups of experimental data.
Based on MoS 2 The strain Raman spectrogram of the sample shows that Raman peaks of three groups of samples all have splitting phenomenon, and visible uniaxial tensile strain is effectively applied to three groups of MoS 2 On the sample. The strain is applied from 0% and the raman peak is red shifted. As the strain increases, the amount of red shift gradually increases. When the strain reaches 2%, moS is enabled 2 The crystal lattice of (A) is deformed and MoS is destroyed 2 The symmetry of the crystal causes the atoms to shift from equilibrium and change phonon modes. The Raman peak begins to cleave and appears
And
two peaks. The strain being further increased in response to vibration of atoms in the plane
The peak continues to shift to the lower Raman wavenumber and reaches a maximum at 5% strainThe value is obtained. MoS 2 Wrinkles or cracks are generated to relax the strain, suppressing a further increase in the internal tensile strain to some extent.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (9)
1. Two-dimensional material strain test device based on piezoceramics its characterized in that: comprises a fastening device, a driving device, a measuring device and a power box (5);
the measuring device is a flexible strain sensor (11), the fastening device comprises two clamping devices and a flexible substrate (10), the flexible substrate (10) and the flexible strain sensor (11) are arranged in an up-down stacked mode and are not in contact with each other, and two ends of the flexible substrate are respectively clamped by the two clamping devices;
the driving device comprises two first piezoelectric ceramics (1), two second piezoelectric ceramics (2), two first structural components (3) and a second structural component (4), wherein the two first structural components (3) are respectively positioned at two sides of the fastening device and are fixed in position, and two sides of the second structural component (4) are respectively connected with the first structural components (3) positioned at two sides through the second piezoelectric ceramics (2); the first structural components (3) on the two sides are connected with the clamping device through first piezoelectric ceramics (1) respectively;
the power box (5) supplies power for the driving device and the measuring device respectively, provides negative voltage for the first piezoelectric ceramics (1) and provides positive voltage for the second piezoelectric ceramics (2).
2. The piezoceramic-based two-dimensional material strain testing device of claim 1, wherein: the clamping device comprises a pair of bilaterally symmetrical square blocks (7), two clamping pieces (9) and a bolt (8), wherein the two clamping pieces (9) are connected to the upper surface and the lower surface of each square block (7) through the bolt (8).
3. The piezoceramic-based two-dimensional material strain testing device of claim 1, wherein: the first piezoelectric ceramics (1) and the first structural member (3) and the clamping device as well as the second piezoelectric ceramics (2) and the first structural member (3) and the second structural member (4) are all welded or cemented.
4. The piezoceramic-based two-dimensional material strain testing device of claim 1, wherein: still include LCD display screen (6), LCD display screen (6) set up on power supply box (5) for show the strain value that flexible strain transducer (11) measured.
5. The piezoceramic-based two-dimensional material strain testing apparatus of claim 1, wherein: the voltage regulation range of the power box (5) is-200V to 200V.
6. The piezoceramic-based two-dimensional material strain testing device of claim 1, wherein: the fastening device and the driving device are both made of non-ferromagnetic materials.
7. The piezoceramic-based two-dimensional material strain testing device of claim 1, wherein: the second structural part (4) is arranged on the power box (5) and can be integrally separated from the power box (5), and the whole fastening device and the driving device are in a suspended state except the second structural part (4).
8. A two-dimensional material strain test method based on the device of any one of claims 1-7, characterized in that: the method comprises the following steps:
step 1: placing a two-dimensional material sample to be tested on a flexible substrate (10), and clamping two ends of the flexible substrate (10) and the two-dimensional material sample by a clamping device;
step 2: switching on a power supply, supplying power to the flexible strain sensor (11), applying negative voltage to the first piezoelectric ceramic (1), applying positive voltage to the second piezoelectric ceramic (2), adjusting the magnitude of the applied voltage to enable the first piezoelectric ceramic (1) to generate compression deformation and the second piezoelectric ceramic (2) to generate tensile deformation, simultaneously stretching the two-dimensional material sample through the fastening device, synchronously generating uniaxial tensile strain through the flexible strain sensor (11), and reading out a real-time strain value of the two-dimensional material sample on the LCD display screen (6);
and 3, step 3: and (4) repeating the steps 1-2 again to perform the next group of tests after the voltage returns to zero.
9. The two-dimensional material strain testing method of claim 8, wherein: in step 2, before the voltage is applied, the method further comprises the step of enabling the testing device to be in a low-temperature environment and/or a magnetic field environment of 4K-300K.
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| PCT/CN2022/087271 WO2023184604A1 (en) | 2022-03-28 | 2022-04-18 | Two-dimensional material strain test device and method based on piezoelectric ceramic |
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| US6025592A (en) * | 1995-08-11 | 2000-02-15 | Philips Electronics North America | High temperature specimen stage and detector for an environmental scanning electron microscope |
| CN110595880A (en) * | 2019-08-16 | 2019-12-20 | 南京理工大学 | Mesoscale cantilever beam bending fatigue testing device and testing method |
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| JP4344850B2 (en) * | 2004-05-21 | 2009-10-14 | 株式会社ユニソク | Micro material testing equipment |
| CN100570324C (en) * | 2007-08-24 | 2009-12-16 | 清华大学 | The measuring method of film single-axis bidirectional micro drafting device and deformation of thin membrane |
| CN100587459C (en) * | 2008-01-25 | 2010-02-03 | 北京工业大学 | Nano material drawing device in scanning electron microscope driven by piezoelectric ceramic piece |
| US8132466B2 (en) * | 2008-06-17 | 2012-03-13 | Utah State University | Mechanical properties testing device and method |
| CN105223076B (en) * | 2015-07-17 | 2018-04-13 | 吉林大学 | Material in situ test device and method under multi-load multiple physical field coupling service condition |
| CN106706424A (en) * | 2016-11-17 | 2017-05-24 | 西安交通大学 | Uniaxial strain loading table for micro-nano material multi-field coupling testing |
| CN107422068B (en) * | 2017-04-21 | 2019-08-23 | 西安交通大学 | A kind of strain loading system for micro-nano material more joint characterizations |
| CN110132717A (en) * | 2019-04-12 | 2019-08-16 | 金华职业技术学院 | A kind of high uniformity stress applying method |
| CN110044530A (en) * | 2019-04-12 | 2019-07-23 | 金华职业技术学院 | A kind of high-precision method for measuring stress |
| CN110057657A (en) * | 2019-04-12 | 2019-07-26 | 金华职业技术学院 | A kind of sample stress bringing device |
| CN212539985U (en) * | 2020-05-11 | 2021-02-12 | 中国科学院上海技术物理研究所 | Miniature uniaxial strain applying device for one-dimensional and two-dimensional nano materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6025592A (en) * | 1995-08-11 | 2000-02-15 | Philips Electronics North America | High temperature specimen stage and detector for an environmental scanning electron microscope |
| CN110595880A (en) * | 2019-08-16 | 2019-12-20 | 南京理工大学 | Mesoscale cantilever beam bending fatigue testing device and testing method |
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