CN111551879A - Weak magnetic field detector based on molecular device - Google Patents
Weak magnetic field detector based on molecular device Download PDFInfo
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- CN111551879A CN111551879A CN202010430292.8A CN202010430292A CN111551879A CN 111551879 A CN111551879 A CN 111551879A CN 202010430292 A CN202010430292 A CN 202010430292A CN 111551879 A CN111551879 A CN 111551879A
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- magnetic field
- oxide particles
- ferroferric oxide
- organic molecules
- weak magnetic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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Abstract
The invention provides a weak magnetic field detector based on a molecular device, wherein organic molecules are arranged between a source electrode and a drain electrode, and ferroferric oxide particles are arranged on the side surface of the organic molecules. Under the action of an alternating weak magnetic field, the ferroferric oxide particles vibrate slightly, so that the distance between the ferroferric oxide particles and organic molecules is changed, the potential barrier between a source electrode and a drain electrode is changed, the conductive characteristic between the source electrode and the drain electrode is changed, and the weak magnetic field is determined according to the change of the conductive characteristic. Because the potential barrier of the organic molecules between the electrodes is very sensitive to the environment around the organic molecules and the micro-vibration of the ferroferric oxide particles is very sensitive to the alternating magnetic field, the method can realize high-sensitivity weak magnetic field measurement. In addition, the invention has small size; the invention realizes magnetic field measurement based on the electromagnetic principle, is easy to integrate, and has important application prospect in the field of weak magnetic field detection.
Description
Technical Field
The invention relates to the field of weak magnetic field detection, in particular to a weak magnetic field detector based on a molecular device.
Background
The magnetic field strength is an important basic physical quantity. The measurement of magnetic field strength relates to various fields in life and production. The traditional magnetic field measurement is based on Hall effect and electromagnetic induction, the device size is large, the measurement sensitivity is low, and weak magnetic field measurement cannot be realized.
Disclosure of Invention
In order to solve the problems, the invention provides a weak magnetic field detector based on a molecular device, which comprises an electric insulating layer, a source electrode, a drain electrode, molecules and ferroferric oxide particles. The source electrode, the drain electrode, the molecules and the ferroferric oxide particles are arranged on the electric insulation layer, the molecules extend between the source electrode and the drain electrode, and the ferroferric oxide particles are arranged on the side surface of the molecules. When the device is used, under the action of a weak magnetic field to be detected, the ferroferric oxide particles vibrate slightly, so that the distance between the ferroferric oxide particles and molecules is changed, the potential barrier between the source electrode and the drain electrode is changed, the conductive characteristic between the source electrode and the drain electrode is changed, and the weak magnetic field is determined through the conductive characteristic.
Further, the material of the source electrode and the drain electrode is gold or graphene.
Further, the molecule is dodecyl mercaptan, anthracene mercaptan, octanediol.
Furthermore, the size of the ferroferric oxide particles is 10-100 nanometers.
Furthermore, the distance between the ferroferric oxide particles and the organic molecules is 0 to 20 nanometers.
Furthermore, the number of the ferroferric oxide particles is more than one.
Furthermore, the ferroferric oxide particles are distributed on two sides of the organic molecules.
Furthermore, the sizes of the ferroferric oxide particles are different.
The invention has the beneficial effects that: the invention provides a weak magnetic field detector based on a molecular device, wherein organic molecules are arranged between a source electrode and a drain electrode, and ferroferric oxide particles are arranged on the side surface of the organic molecules. Under the action of an alternating weak magnetic field, the ferroferric oxide particles vibrate slightly, so that the distance between the ferroferric oxide particles and organic molecules is changed, the potential barrier between a source electrode and a drain electrode is changed, the conductive characteristic between the source electrode and the drain electrode is changed, and the weak magnetic field is determined according to the change of the conductive characteristic. Because the potential barrier of the organic molecules between the electrodes is very sensitive to the environment around the organic molecules and the micro-vibration of the ferroferric oxide particles is very sensitive to the alternating magnetic field, the method can realize high-sensitivity weak magnetic field measurement. In addition, the invention has small size; the invention realizes magnetic field measurement based on the electromagnetic principle, is easy to integrate, and has important application prospect in the field of weak magnetic field detection.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a weak magnetic field detector based on a molecular device.
Fig. 2 is a schematic diagram of another weak magnetic field detector based on a molecular device.
In the figure: 1. a source electrode; 2. a drain electrode; 3. an organic molecule; 4. ferroferric oxide particles.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The invention provides a weak magnetic field detector based on a molecular device, which comprises an electric insulating layer, a source electrode 1, a drain electrode 2, organic molecules 3 and ferroferric oxide particles 4 as shown in figure 1. The source electrode 1, the drain electrode 2, the organic molecules 3 and the ferroferric oxide particles 4 are arranged on the electric insulating layer. The source electrode 1 and the drain electrode 2 are gold or graphene. The organic molecule 3 extends between the source electrode 1 and the drain electrode 2, and the organic molecule 3 is connected with the source electrode 1 and the drain electrode 2 in a physical contact mode, a covalent bond connection mode and a chemical adsorption mode. The organic molecule 3 is dodecyl mercaptan, anthracene mercaptan, octanediol, but is not limited thereto, and any organic molecule that can be connected between the source electrode 1 and the drain electrode 2 and can conduct electricity is within the scope of the present invention. The ferroferric oxide particles 4 are arranged on the side surfaces of the organic molecules 3. The size of the ferroferric oxide particles 4 is 10-100 nanometers, so that the energy of the alternating magnetic field can be better absorbed.
When the device is used, under the action of a weak magnetic field to be detected, the ferroferric oxide particles 4 vibrate slightly, so that the distance between the ferroferric oxide particles 4 and the organic molecules 3 is changed, the potential barrier between the source electrode 1 and the drain electrode 2 is changed, the conductive characteristic between the source electrode 1 and the drain electrode 2 is changed, and the weak magnetic field to be detected is determined through the conductive characteristic. Because the potential barrier formed by the organic molecules 3 between the source electrode 1 and the drain electrode 2 is very sensitive to the environment around the organic molecules 3 and the micro-vibration of the ferroferric oxide particles 4 is very sensitive to the alternating magnetic field, the invention can realize high-sensitivity weak magnetic field measurement. In addition, the invention has small size; the invention realizes magnetic field measurement based on the electromagnetic principle, is easy to integrate, and has important application prospect in the field of weak magnetic field detection.
In addition, under the action of an alternating magnetic field, the ferroferric oxide particles 4 can generate heat, and due to heat transfer or heat radiation, the temperature of the organic molecules 3 is increased, so that the charge transport capacity of electrons in the organic molecules 3 is improved, and the conductive capacity of the organic molecules 3 is improved. Therefore, the detection sensitivity of the present invention is higher because of the mechanism of this aspect.
Furthermore, the distance between the ferroferric oxide particles 4 and the organic molecules 3 is 0-20 nanometers, so that the influence of the ferroferric oxide particles 4 on the conductive characteristics of the organic molecules 3 is improved. Of course, the distance can also be made larger, depending on the strength of the magnetic field to be measured. That is, the distance between the ferroferric oxide particles 4 and the organic molecules 3 can be increased when a stronger magnetic field is detected.
Furthermore, the ferroferric oxide particles 4 may also be on top of the organic molecules 3, i.e. the ferroferric oxide particles 4 may press against the organic molecules 3. Thus, when an alternating magnetic field is applied to the ferroferric oxide particles 4, the ferroferric oxide particles 4 vibrate slightly, so that the organic molecules 3 deform, and the deformation is beneficial to the organic molecules 3 to capture more charges temporarily, and then the charges are transferred to the drain electrode 2. On the other hand, the ferroferric oxide particles 4 are in contact with the organic molecules 3, so that the temperature of the organic molecules 3 is increased more, and the conductive property of the organic molecules 3 is improved. Therefore, the ferroferric oxide particles 4 arranged on the organic molecules 3 can realize weak magnetic field detection with higher sensitivity.
Because the ferroferric oxide particles 4 can be arranged on the side surfaces of the organic molecules 3 and can also be arranged on the organic molecules 3, when the requirement on the measurement sensitivity is not high, the position of the ferroferric oxide particles 4 does not need to be accurately arranged in the experiment, and the experiment difficulty is reduced.
Example 2
In example 1, as shown in fig. 2, the number of the magnetite particles 4 is plural. The ferroferric oxide particles 4 are distributed on two sides of the organic molecules 3. The sizes of the ferroferric oxide particles 4 are different. The ferroferric oxide particles 4 with different sizes are beneficial to the ferroferric oxide particles 4 to absorb alternating magnetic fields with different frequencies. The ferroferric oxide particles 4 are arranged on two sides of the organic molecules 3, so that potential barriers formed by the organic molecules 3 can be changed more, the conductive property between the source electrode 1 and the drain electrode 2 can be changed more, and the sensitivity of magnetic field detection is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A weak magnetic field detector based on a molecular device is characterized by comprising an electric insulating layer, a source electrode, a drain electrode, organic molecules and ferroferric oxide particles, wherein the source electrode, the drain electrode, the organic molecules and the ferroferric oxide particles are arranged on the electric insulating layer, the organic molecules extend between the source electrode and the drain electrode, and the ferroferric oxide particles are arranged on the side surface of the organic molecules; when the device is used, under the action of a weak magnetic field to be detected, the ferroferric oxide particles vibrate slightly, so that the distance between the ferroferric oxide particles and the organic molecules is changed, the potential barrier between the source electrode and the drain electrode is changed, the conductive characteristic between the source electrode and the drain electrode is changed, and the weak magnetic field is determined through the conductive characteristic.
2. The weak magnetic field detector based on molecular device as claimed in claim 1, wherein: the source electrode and the drain electrode are made of gold or graphene.
3. The weak magnetic field detector based on molecular device as claimed in claim 2, wherein: the organic molecules are dodecyl mercaptan, anthracene mercaptan and octanediol.
4. The weak magnetic field detector based on molecular device as claimed in claim 3, wherein: the size of the ferroferric oxide particles is 10-100 nanometers.
5. The weak magnetic field detector based on molecular device as claimed in claim 4, wherein: the distance between the ferroferric oxide particles and the organic molecules is 0-20 nanometers.
6. The weak magnetic field detector based on molecular device according to any one of claims 1 to 5, wherein: the number of the ferroferric oxide particles is multiple.
7. The weak magnetic field detector based on molecular device as claimed in claim 6, wherein: the ferroferric oxide particles are distributed on two sides of the organic molecules.
8. The weak magnetic field detector based on molecular device as claimed in claim 7, wherein: the sizes of the ferroferric oxide particles are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430292.8A CN111551879A (en) | 2020-05-20 | 2020-05-20 | Weak magnetic field detector based on molecular device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430292.8A CN111551879A (en) | 2020-05-20 | 2020-05-20 | Weak magnetic field detector based on molecular device |
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| Publication Number | Publication Date |
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| CN111551879A true CN111551879A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010430292.8A Withdrawn CN111551879A (en) | 2020-05-20 | 2020-05-20 | Weak magnetic field detector based on molecular device |
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| CN (1) | CN111551879A (en) |
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2020
- 2020-05-20 CN CN202010430292.8A patent/CN111551879A/en not_active Withdrawn
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Application publication date: 20200818 |
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| WW01 | Invention patent application withdrawn after publication |