CN106908481A - A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics - Google Patents
A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics Download PDFInfo
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- CN106908481A CN106908481A CN201710124635.6A CN201710124635A CN106908481A CN 106908481 A CN106908481 A CN 106908481A CN 201710124635 A CN201710124635 A CN 201710124635A CN 106908481 A CN106908481 A CN 106908481A
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- piezoelectric ceramics
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics, is related to Mechanical controllable to split knot device.Including base, shielded box, fixture, stepper motor, piezoelectric ceramics, chip, wire, liquid pool and sealing ring；The base is round platform base, and the fixture is Wedge gripping, and in shielded box, the piezoelectric ceramics is placed in chassis interior to the base by the gluing stepper motor tops that are attached to of AB, and piezoelectric ceramics is protruded from base interstitial hole；The fixture is screwed on base, and the chip is fixed on fixture, and wire is connected by crocodile clip with external measuring circuitry, and the liquid pool is arranged on hanging wire top；Target molecule solution is instilled in liquid pool.
Description
Technical field
Knot device is split the present invention relates to Mechanical controllable, more particularly, to machinery associated with a kind of stepper motor and piezoelectric ceramics
It is controllable to split knot device.
Background technology
Molectronics is to study the single or a small number of electricity of atom, molecule, supermolecule and elementide in nanoscale
Learn the science of property, its final goal is to replace traditional silicon-based electronic elements with these research objects, assembling logic circuit or even
Molecular computer.With PSTM (Scanning Tunneling Microscope, STM), AFM
A series of realities that can be manipulated in nanoscale such as (Atomic Force Microscope, AFM), micro-nano process technology
The invention of proved recipe method, and the advanced e measurement technology such as unimolecule spectrum, low level test, ultrafast testing current development, molecule
The research of electronics enters into experiment and constructs and the sign stage by the theoretical prediction stage, so as to greatly promote molectronics
Development.For present Research, molectronics has two problem demanding prompt solutions, and one is how easy, economical, rapidly
Molecule/metal/molecule knot is constructed, i.e., how to reduce the research threshold of molectronics；Two is how to make the molecule/gold constructed
Category/molecule knot is stablized, is connected in macroscopic circuit for a long time, i.e., how to carry polymer/metal/molecule knot test characterization result
Robustness.
Aspect is built in molecular structure, the two methods for generally using in the world are that PSTM splits knot (STM-
Break Junction, STM-BJ) method and Mechanical controllable split knot (Mechanically Controllable Break
Junction, MCBJ) method.Although STM-BJ methods can be realized based on transformation is carried out to commercial STM instruments, this side
Method instrument price is expensive, experimental implementation is complicated, and the vibration of the peering external environment of molecule constructed is very sensitive.By comparison,
MCBJ methods equally have the ability for quickly constructing a large amount of molecule knots in a short time, and former based on the unique experiment of MCBJ methods
Reason, when the vibration of external environment is delivered to molecule knot, therebetween in the presence of a great attenuation coefficient (3~5 orders of magnitude).
Therefore, the molecule knot that MCBJ methods are constructed more is stablized.The core of MCBJ experimental provisions is fixture and chip, the former and MCBJ
The resistance to overturning of device is related, and the latter is related to the attenuation coefficient of MCBJ devices, and the two has together decided on constructed molecule
The stability of knot.At present, the chip preparation method for generally using in the world has micro-nano process technology and cutting gold thread
(Notched wire) method.The chip prepared using micro-nano process technology, although attenuation coefficient is larger, due to needing
Clean room environment, manufacture craft are cumbersome and relatively costly, and this method is difficult to be promoted in common lab.By comparison,
Notched wire methods have it is with low cost, make it is quick, the outstanding advantages such as can make in common lab, but Notched
The attenuation coefficient of wire chips is smaller, therefore using the existing conventional MCBJ bases and fixture for being seen in report, it is difficult to constructing can
The molecule knot of long-time stable.On the other hand, the manufacturing process technological parameter of Notched wire chips is more, often results in prepared
Chip repeatability it is relatively low.For these reasons, develop it is a set of it is easy, economical can realize at room temperature molecule knot it is long when
Between the new MCBJ devices constructed of stabilization it is necessary.
The content of the invention
Notched wire present in knot (MCBJ) technology are split it is an object of the invention to be directed to existing Mechanical controllable
The shortcomings of chip attenuation coefficient is smaller, there is provided a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics.
The present invention includes base, shielded box, fixture, stepper motor, piezoelectric ceramics, chip, wire, liquid pool and sealing
Circle；
The base is round platform base, and the fixture is Wedge gripping, and the base in shielded box, make pottery by the piezoelectricity
Porcelain is placed in chassis interior by the gluing stepper motor tops that are attached to of AB, and piezoelectric ceramics is protruded from base interstitial hole；The fixture
It is screwed on base, the chip is fixed on fixture, wire is connected by crocodile clip with external measuring circuitry,
The liquid pool is arranged on hanging wire top；Target molecule solution is instilled in liquid pool.
The liquid pool is provided with sealing ring, and liquid pool can choose polytetrafluoroethylmaterial material, and liquid pool can be used with perforation structure
Cuboid liquid pool, for containing the solution containing target molecule, the groove that can be matched with sealing ring is provided with liquid pool bottom.Utilize
The screw of the stainless steel base of liquid pool and chip fix and sealing ring shrinkage, realize the sealing of liquid in liquid pool.
The shielded box can use cuboid shielded box, and suspension is placed in the shielded box, for two grades of vibrationproof, with
The interference that extraneous vibration is triggered is reduced, the shielded box has isolation introduced contaminants molecule, prevents it molten to target molecule simultaneously
Liquid produces the function of pollution.
In MCBJ experiments, base and fixture with high stability can effectively completely cut off extraneous slight vibration to receiving
The influence of rice spaced electrode pair.The common structures such as cylinder, square, hemisphere, round platform are managed using Comsol softwares
By simulation, it is a discovery of the invention that under low frequency condition, the vibratory response basic that various common structures change with extraneous vibration frequency
Cause, but as frequency increases, the vibration velocity of round platform is significantly less than other several structures, shows more stable property.
Therefore, the present invention uses round platform base and Wedge gripping, is used to ensure the stability of the constructed molecule knot of MCBJ experiments, Yi Jishi
Test the repeatability of data.
In MCBJ experiments, the push rod of beneath chips is driven plunger tip piece in power, and stress is delivered into metal on chip
The overhanging portion of silk, and then wire is constantly attenuated until fracture, forms nanometer intervals.Common push rod have stepper motor and
Two kinds of piezoelectric ceramics.Stepper motor has the features such as step pitch is big, speed is fast, load is big, and piezoelectric ceramics has that step pitch is small, advance
The features such as speed is slow, load is small.The step pitch of stepper motor is 10-6M magnitudes, due to Notched wire chips attenuation coefficient only
It is 102~103If exclusive use stepper motor only has 10 as push rod, the then knots modification of nanometer intervals-8~10-9M, experiment
In be difficult to nanometer intervals accuracy controlling, the even greater than length of individual molecule.And the precision of piezoelectric ceramics often may be used
Up to 10-9M magnitudes, therefore be necessary using piezoelectric ceramics.However, piezoelectric ceramics is used alone as push rod, then top is opened for the first time
The process of wire needs to take considerable time that conventional efficient is low.Therefore, the present invention combines stepper motor and piezoelectric ceramics is each
From advantage, it is proposed that it is a kind of by both carry out associated with design.First with stepper motor realize large scale, high speed,
The chip bending of big load, after wire is broken, driving force is switched to by the smaller but more fine piezoelectricity of step pitch
Ceramics are provided.The proposition of this combination scheme so that excellent push rod performance indications can be obtained under extremely low cost conditions,
Common commercially available stepper motor can meet requirement of experiment with piezoelectric ceramics.
The liquid pool that the present invention is used is applied to the miniature liquid pool design of MCBJ experiments, and liquid pool can choose polytetrafluoroethylene (PTFE)
Material, processes the cuboid liquid pool with perforation structure, for containing the solution containing target molecule.At miniature liquid pool bottom
Portion, leaves the groove matched with O-ring seal in advance.Fixed and O-shaped sealing using the screw of liquid pool and stainless steel substrates substrate
The shrinkage of circle, realizes the sealing of liquid in micro electrolytic cell.
Due to placing suspension in shielded box, can be used for two grades of vibrationproof, to reduce the interference that extraneous vibration is triggered.Should
Shielded box has isolation introduced contaminants molecule simultaneously, prevents it from the function of pollution is produced to target molecule solution.
The brief step for carrying out experiment using the present invention is as follows：The base of central hollow is placed in shielded box；By piezoelectricity
Ceramics are attached to stepper motor top, one are placed in chassis interior by the way that AB is gluing, and piezoelectric ceramics is protruded from base interstitial hole；Will folder
Tool is screwed on base；Chip is fixed on fixture；The wire that will do not fixed by epoxy resin passes through crocodile
Folder is connected with external measuring circuitry；Liquid pool containing sealing ring is arranged on hanging wire top；By target molecule solution drop
Enter in liquid pool；Treat that molecular self-assembling is finished, open stepper motor；After wire is broken, driving force is cut by stepper motor
It is changed to piezoelectric ceramics；Control piezoelectric ceramics pumps, and makes that molecule knot is quick, a large amount of, is repetitively formed and is broken；Utilize
External measuring circuitry carries out electrical characterization to molecule knot.
The advantage of the invention is that：One stability is built using few part high and can precise control nanometer intervals
Stepper motor and Mechanical controllable associated with piezoelectric ceramics split knot device, the single molecule structure compared to complicated and costliness before builds dress
Put, the present invention has the advantages that with low cost, easy to operate and molecule knot stability is high, experimental results are repeated high, this
Outward, experimental program proposed by the invention can be carried out in Experiment of General Chemistry room, with good universality.
Brief description of the drawings
Fig. 1 is the positive structure diagram of the embodiment of the present invention.
Fig. 2 is the overlooking the structure diagram of the embodiment of the present invention.
Fig. 3 is the present invention looks up structural representation of the embodiment of the present invention.
Fig. 4 is the Notched wire chip schematic diagrames after the cutting of the embodiment of the present invention.
Fig. 5 is the round platform base schematic diagram of the embodiment of the present invention.
Fig. 6 is the Wedge gripping schematic diagram of the embodiment of the present invention.
Fig. 7 is the liquid pool elevational schematic view of the splendid attire molecular solution of the embodiment of the present invention.
Fig. 8 is the liquid pool front-view schematic diagram of the splendid attire molecular solution of the embodiment of the present invention.
Specific embodiment
Following examples will the present invention is further illustrated with reference to accompanying drawing.
Referring to Fig. 1~8, the embodiment of the present invention includes base 1, shielded box, fixture 6, stepper motor 5, piezoelectric ceramics 4, core
Piece 3, wire 33, liquid pool 2 and sealing ring.
The base 1 is round platform base, and the fixture 6 is Wedge gripping, and the base 1 is located in shielded box, the pressure
Electroceramics 4 is placed in inside base 1 by the gluing tops of stepper motor 5 that are attached to of AB, and piezoelectric ceramics 4 is protruded from the interstitial hole of base 1；
The fixture 6 is screwed on base 1, and the chip 3 is fixed on fixture 6, wire 33 by crocodile clip with it is outer
Portion's measuring circuit is connected, and the liquid pool 2 is arranged on the top of hanging wire 33；Target molecule solution is instilled in liquid pool 2.
The liquid pool 2 is provided with sealing ring, and liquid pool 2 can choose polytetrafluoroethylmaterial material, and liquid pool 2 can be using with perforation structure
Cuboid liquid pool, for containing the solution containing target molecule, the groove that can be matched with sealing ring is provided with the bottom of liquid pool 2.
Fixed using the screw of liquid pool 2 and the stainless steel base 31 of chip 3 and sealing ring shrinkage, realize liquid in liquid pool 2
Sealing.
The shielded box can use cuboid shielded box, and suspension is placed in the shielded box, for two grades of vibrationproof, with
The interference that extraneous vibration is triggered is reduced, the shielded box has isolation introduced contaminants molecule, prevents it molten to target molecule simultaneously
Liquid produces the function of pollution.In fig. 4, mark 32 represents epoxy resin.
Specific embodiment given below.
Unimolecule conductance experiment is carried out using Notched wire chips.
1st, chip is cleaned
The chip that the advance epoxy resin being cured will be loaded with is placed in beaker, is placed in ultra-pure water and is boiled and keep
Boiling 10 minutes.105 DEG C of oven for drying are put into after taking-up, or are dried up using nitrogen.
2nd, spun gold is cut
Because gold utensil has the advantages that ductility is good, stable, not oxidizable and is easily combined with testing molecule anchoring group, this
Experiment prepares Notched wire chips from spun gold.Will clean, drying after chip be placed under light microscope, use scalpel
Piece is directed at the middle body of hanging spun gold, it is first crosscutting fall half, then make spun gold phase in spun gold each side partial application with point of a knife
Connect only about 20~30 μm of part.
3rd, chip
Fixture is installed on base first, then is picked up with the chip that tweezers will make, be installed in fixture.
4th, liquid pool is cleaned
Liquid pool is put into the Piranha washing lotion of Nong Liu Suan ︰ hydrogen peroxide=3 ︰ 1 and embathes at least 2h, outwell the anthropophagy in beaker
Fish solution, is rinsed repeatedly with ultra-pure water, then is boiled 3 times using ultra-pure water heating, is finally cleaned by ultrasonic 3min with ultra-pure water again.Clearly
Wash and drying in 105 DEG C of baking ovens is put into after finishing, or dried up using nitrogen.
The 5th, liquid pool is installed
Liquid pool is a cuboid for perforation, sealing ring is placed in after being fixed in the hole of liquid pool bottom, will be with close
The liquid pool of seal is placed on the surface of hanging spun gold, is screwed.The spun gold not being covered with epoxy on chip is from liquid
Two ends preformed hole above pond is passed, and is clamped with two crocodile clips respectively, thus accesses extraneous measuring loop.
6th, molecular solution is added dropwise
25 μ L molecular solution are drawn with 100 μ L liquid-transfering guns and add liquid pool, molecular solution is submerged spun gold.Cover liquid pool lid
Son, prevents the impurity molecule in air from entering.
7th, data acquisition
Install, close shielding chamber door, start stepper motor driver chip bending, after spun gold is broken, automatically
It is switched to the bending of piezoelectric ceramics control chip.In piezoelectric ceramics small upper top, back off procedure, molecule knot be repetitively formed and
Fracture.This process gathers the electrical characterization data of a large amount of molecule knots using extraneous measuring loop, remains subsequent analysis.
This experimental technique has versatility, it is necessary to when testing variety classes molecule knot, need to only change Metal wire material and divide
Sub- solution.
The chip can be prepared using following methods：
1st, the preparation of stainless steel base.Buying 30mm is long, 10mm is wide, the stainless steel substrates of 200 μ m-thicks, with acetone and ethanol
Sequence is cleaned by ultrasonic, then with sand papering, is used to increase contact angle of the epoxy resin on surface, and increasing friction force finally uses pure water
Cleaning, dry for standby.For the stainless steel substrates for reclaiming, first the bulk epoxy resin on surface is polished removal, then with nitric acid and water
Volume ratio is the mixed solution 2~3h of digestion of 1 ︰ 1, then is cleaned with distilled water, dries stand-by.
2nd, the preparation of epoxy resin.(1g resins can prepare about 10 to weigh a certain amount of Stycast 2850FT types resin
Chip, taken amount is needed according to experiment), catalyst is equipped with resin quality than the Henkel Loctite for 3.5%~4%
The catalyst of Catalyst 9, uniform stirring at least 10min.Mixing time is too short, and polymerisation is difficult to fully carry out, during stirring
Between oversize then resin viscosity it is excessive, be unfavorable for follow-up smearing flow.
3rd, the smearing of epoxy resin.By stainless steel substrates drawout, epoxy resin is dipped in stainless steel substrates center uniform application
In two circles, while making two circles close proximity to spacing is controlled in 1~2mm.Two epoxy resin are justified far apart, after causing
Spun gold is difficult to be broken when continuous MCBJ is tested, and post-rift electrode pair is unstable.Conversely, if two epoxy resin circle is at a distance of too near,
In follow-up placement spun gold, due to the presence of capillarity, two epoxy resin easily contact with each other under spun gold, and this will cause
Hanging metal wire structure cannot be formed necessary to MCBJ experiments.
4th, the placement of wire.After epoxy resin slightly solidifies, by a diameter of 0.1mm, the wire of 30mm long is stretched
And two centers of epoxy resin circle are laid in, gently press wire the epoxy resin at two ends is submerged wire with tweezers.This step
Wire is pullled in rapid never left and right, to avoid wire overhanging portion from being polluted by epoxy resin, also can not excessively push metal
Silk, otherwise in follow-up baking process, wire easily sinks to contacting stainless steel base and causes short circuit.
5th, the solidification of epoxy resin.Chip is first placed into 2h in room temperature, 60 DEG C of baking oven baking 12h are put into after slightly solidifying.
The chip being fully cured is presented bright black, and surface is smooth without hole.
Claims (6)
1. a kind of stepper motor and Mechanical controllable associated with piezoelectric ceramics split knot device, it is characterised in that including base, shielded box,
Fixture, stepper motor, piezoelectric ceramics, chip, wire, liquid pool and sealing ring；
The base is round platform base, and the fixture is Wedge gripping, and in shielded box, the piezoelectric ceramics leads to the base
Cross the gluing stepper motor tops that are attached to of AB and be placed in chassis interior, piezoelectric ceramics is protruded from base interstitial hole；The fixture passes through
Screw is fixed on base, and the chip is fixed on fixture, and wire is connected by crocodile clip with external measuring circuitry, described
Liquid pool is arranged on hanging wire top；Target molecule solution is instilled in liquid pool.
2. a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics as claimed in claim 1, it is characterised in that
The liquid pool is provided with sealing ring.
3. a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics as claimed in claim 1, it is characterised in that
The liquid pool uses polytetrafluoroethylmaterial material.
4. a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics as described in claim 1 or 2 or 3, and it is special
It is that the liquid pool uses the cuboid liquid pool with perforation structure to levy, and the groove matched with sealing ring is provided with liquid pool bottom.
5. a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics as claimed in claim 1, it is characterised in that
The shielded box uses cuboid shielded box.
6. a kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics as claimed in claim 1, it is characterised in that
Suspension is placed in the shielded box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124635.6A CN106908481A (en) | 2017-03-03 | 2017-03-03 | A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124635.6A CN106908481A (en) | 2017-03-03 | 2017-03-03 | A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics |
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| CN201710124635.6A Pending CN106908481A (en) | 2017-03-03 | 2017-03-03 | A kind of stepper motor splits knot device with Mechanical controllable associated with piezoelectric ceramics |
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Cited By (3)
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|---|---|---|---|---|
| CN107315032A (en) * | 2017-07-06 | 2017-11-03 | 厦门大学 | A kind of Mechanical controllable with highly attenuating coefficient splits knot device |
| CN107817384A (en) * | 2017-10-26 | 2018-03-20 | 厦门大学 | A kind of design method of the unimolecule electrical measurement device of vibration isolation configuration |
| CN108198937A (en) * | 2017-12-28 | 2018-06-22 | 厦门大学 | A kind of graphene/fullerene/graphene all-carbon molecular device construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107315032A (en) * | 2017-07-06 | 2017-11-03 | 厦门大学 | A kind of Mechanical controllable with highly attenuating coefficient splits knot device |
| CN107817384A (en) * | 2017-10-26 | 2018-03-20 | 厦门大学 | A kind of design method of the unimolecule electrical measurement device of vibration isolation configuration |
| CN108198937A (en) * | 2017-12-28 | 2018-06-22 | 厦门大学 | A kind of graphene/fullerene/graphene all-carbon molecular device construction method |
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Application publication date: 20170630 |