CN111537473A - Surface plasmon enhanced molecular device gas sensor - Google Patents
Surface plasmon enhanced molecular device gas sensor Download PDFInfo
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- CN111537473A CN111537473A CN202010431005.5A CN202010431005A CN111537473A CN 111537473 A CN111537473 A CN 111537473A CN 202010431005 A CN202010431005 A CN 202010431005A CN 111537473 A CN111537473 A CN 111537473A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
- G01N21/554—Attenuated total reflection and using surface plasmons detecting the surface plasmon resonance of nanostructured metals, e.g. localised surface plasmon resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
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Abstract
The invention provides a surface plasmon enhanced molecular device gas sensor, wherein a metal oxide part is arranged below an organic molecule, and noble metal particles are arranged on the metal oxide part and the organic molecule. Under the irradiation of laser or other light sources in an oxygen environment, more oxygen molecules near the upper surface of the metal oxide part are changed into oxygen anions, and organic molecules are in the oxygen anion environment; in the environment of gas molecules to be detected and under the irradiation of laser or other light sources, the gas molecules to be detected react and combine with oxygen anions, and the organic molecules are in a neutral environment. The environment around the organic molecule is more changed and the conductance between the source and drain electrodes is more changed than when only the metal oxide portion is used, and highly sensitive detection of gas molecules is realized based on the difference in conductance. The invention has the advantage of high sensitivity because the activation energy of the organic molecule is very sensitive to the surrounding environment.
Description
Technical Field
The invention relates to the field of gas sensing, in particular to a surface plasmon enhanced molecular device gas sensor.
Background
The content of various gases in the environment is very important in various fields such as agriculture, industry, national defense and the like. In particular, the content of gas in extreme environments has an important influence on production and life. The traditional gas sensor has large size and low sensitivity, and the development of the gas sensor is restricted.
Disclosure of Invention
In order to solve the above problems, the present invention provides a surface plasmon enhanced molecular device gas sensor, which includes a substrate, two electrical insulating portions, two metal oxide portions, a source electrode, a drain electrode, organic molecules, and noble metal particles, wherein the electrical insulating portions and the metal oxide portions are disposed on the substrate, a penetrating slit is disposed in the metal oxide portions, the two electrical insulating portions are disposed on both sides of the metal oxide portions, the source electrode and the drain electrode are disposed on the electrical insulating portions, the organic molecules extend between the source electrode and the drain electrode, and the noble metal particles are disposed on the organic molecules and the metal oxide portions. When the device is used, firstly, the conductance between the source electrode and the drain electrode is measured in an oxygen environment and under laser irradiation, then, the conductance between the source electrode and the drain electrode is measured in a gas molecule environment to be detected and under laser irradiation, and gas molecule detection is realized through the difference between the two conductances.
Further, the material of the source electrode and the drain electrode is gold or graphene.
Further, the organic molecule is dodecyl mercaptan, anthracene mercaptan, octanediol.
Further, the metal oxide part is one or more of ferric oxide, copper oxide, zinc oxide, cobaltosic oxide, nickel oxide and titanium oxide.
Further, the noble metal particles are gold, and the particle size of the noble metal particles is 20 nm to 80 nm.
Further, metal oxide particles are provided on the metal oxide portion.
Further, the material of the metal oxide particles is different from that of the metal oxide portion.
The invention has the beneficial effects that: the invention provides a surface plasmon enhanced molecular device gas sensor, wherein a metal oxide part is arranged below an organic molecule, and noble metal particles are arranged on the metal oxide part and the organic molecule. Under the irradiation of laser or other light sources in an oxygen environment, the noble metal particles generate surface plasmon resonance, a stronger electric field is generated on the upper surface of the metal oxide part, more oxygen molecules near the upper surface of the metal oxide part are changed into oxygen anions, and the organic molecules are in the oxygen anion environment; in the environment of gas molecules to be detected and under the irradiation of laser or other light sources, the gas molecules to be detected react and combine with oxygen anions, and the organic molecules are in a neutral environment. Compared with the method using only the metal oxide part, the method has the advantages that the environment around the organic molecules is changed more, the activation energy of the organic molecules is changed more, the potential barrier between the source electrode and the drain electrode is changed more, the conductance between the source electrode and the drain electrode is changed more, and the gas molecules are detected with high sensitivity according to the difference of the conductance. The activation energy of the organic molecules is very sensitive to the surrounding environment, so the method has the advantage of high sensitivity and has good application prospect in the field of gas molecule 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 surface plasmon enhanced molecular device gas sensor.
In the figure: 1. a substrate; 2. an electrically insulating section; 3. a metal oxide portion; 4. a source electrode; 5. a drain electrode; 6. an organic molecule; 7. noble metal particles; 8. a gap.
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 surface plasmon enhanced molecular device gas sensor, which comprises a substrate 1, an electric insulation part 2, a metal oxide part 3, a source electrode 4, a drain electrode 5, organic molecules 6 and noble metal particles 7, as shown in figure 1. The number of the electrically insulating portions 2 is two. Two electrically insulating parts 2 and a metal oxide part 3 are placed on the substrate 1. A through-slit 8 is provided in the metal oxide portion 3. The slit 8 may be one or more. Preferably, the slit 8 is a plurality of strips. The substrate 1 may be an insulating material or a conductive or semiconductor material. The electrical insulation 2 is an insulating material. The metal oxide part 3 is made of one or more of ferric oxide, copper oxide, zinc oxide, cobaltosic oxide, nickel oxide and titanium oxide. The electrically insulating portions 2 are disposed on both sides of the metal oxide portion 3. The source electrode 4 and the drain electrode 5 are arranged on the electric insulation part 2, and the material of the source electrode 4 and the drain electrode 5 is gold or graphene. The organic molecule 6 extends between the source electrode 4 and the drain electrode 5, and the organic molecule 6 is connected with the source electrode 4 and the drain electrode 5 in a physical contact mode, a covalent bond connection mode and a chemical adsorption mode. The organic molecule 6 is dodecyl mercaptan, anthracene mercaptan, octanediol. However, it is not limited thereto, and the organic molecules 6 that can be connected between the source electrode 4 and the drain electrode 5 and can conduct electricity are within the scope of the present invention. As shown in fig. 1, the organic molecules 6 are also on the electrically insulating portion 2 and the metal oxide portion 3. The noble metal particles 7 are disposed on the organic molecules 6 and the metal oxide portion 3. Because in practice, when the noble metal particles 7 are provided on the metal oxide portion 3, most of the noble metal particles 7 are provided on the metal oxide portion 3 and a small number of the noble metal particles 7 are provided on the organic molecules 7. In particular, the width of the slit 8 is larger than the particle diameter of the noble metal particle 7 to prevent the noble metal particle 7 from communicating with the metal oxide on both sides of the slit 8 and from forming a passage.
When the device is used, firstly, the conductance between the source electrode 4 and the drain electrode 5 is measured in an oxygen environment and under the irradiation of laser or other light sources, then, the conductance between the source electrode 4 and the drain electrode 5 is measured in a gas molecule environment to be detected and under the irradiation of laser or other light sources, and the gas molecule detection is realized through the difference between the two conductances.
In an oxygen environment and under the irradiation of laser or other light sources, the noble metal particles 7 generate surface plasmon resonance, a stronger electric field is generated on the upper surface of the metal oxide part 3, more oxygen molecules near the upper surface of the metal oxide part 3 are changed into oxygen anions, and the organic molecules 6 are in the oxygen anion environment; in the environment of the gas molecules to be detected and under the irradiation of laser or other light sources, the gas molecules to be detected react and combine with oxygen anions, and the organic molecules 6 are in a neutral environment. Compared with the case of using only the metal oxide portion 3, the environment around the organic molecule 6 is changed more, the activation energy of the organic molecule 6 is changed more, the potential barrier between the source electrode 4 and the drain electrode 5 is changed more, the conductance between the source electrode 4 and the drain electrode 5 is changed more, and the gas molecule is detected with high sensitivity according to the difference between the conductances. The activation energy of the organic molecules 6 is very sensitive to the surrounding environment, so the method has the advantage of high sensitivity and has good application prospect in the field of gas molecule detection.
In addition, the slits 8 of the present invention not only block the current passing through the metal oxide portion 3, but also allow the metal oxide portion 3 to have more surface area, which will generate more oxygen anions around the metal oxide portion 3, thereby generating more conductance changes and improving the sensitivity of gas detection. On the other hand, the slits 8 are also beneficial to generating a stronger electric field near the noble metal particles 7, which is also beneficial to generating more oxygen anions near the metal oxide part 3, and further improving the detection sensitivity.
Further, the noble metal particles 7 are gold, and the particle diameter of the noble metal particles 7 is 20 nm to 80 nm. So that the noble metal particles 7 are irradiated with visible light to generate surface plasmon resonance.
Example 2
In addition to example 1, metal oxide particles were provided on the metal oxide portion 3. The material of the metal oxide particles is the same as or different from that of the metal oxide portion 3. The material of the metal oxide particles is the same as the material of the metal oxide portion 3, which means that the surface area of the metal oxide material is increased, and more oxygen anions are generated. When the material of the metal oxide particles is different from that of the metal oxide part 3, a heterojunction is formed between the metal oxide particles and the metal oxide part 3, and due to the limiting effect of the heterojunction, a stronger electric field is formed nearby the noble metal particles 7, more oxygen anions are finally generated, and the sensitivity of gas 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 (7)
1. A surface plasmon enhanced molecular device gas sensor is characterized by comprising a substrate, an electric insulation part, a metal oxide part, a source electrode, a drain electrode, organic molecules and precious metal particles, wherein the electric insulation part and the metal oxide part are arranged on the substrate, a penetrating gap is arranged in the metal oxide part, the electric insulation part is arranged on two sides of the metal oxide part, the source electrode and the drain electrode are arranged on the electric insulation part, the organic molecules extend between the source electrode and the drain electrode, and the precious metal particles are arranged on the organic molecules and the metal oxide part; when the device is used, firstly, the conductance between the source electrode and the drain electrode is measured in an oxygen environment and under laser irradiation, then, the conductance between the source electrode and the drain electrode is measured in a gas molecule environment to be detected and under laser irradiation, and gas molecule detection is realized through the difference between the two conductances.
2. The surface plasmon-enhanced molecular device gas sensor of claim 1 wherein: the source electrode and the drain electrode are made of gold or graphene.
3. The surface plasmon-enhanced molecular device gas sensor of claim 2 wherein: the organic molecules are dodecyl mercaptan, anthracene mercaptan and octanediol.
4. The surface plasmon-enhanced molecular device gas sensor of claim 3 wherein: the metal oxide part is composed of one or more of ferric oxide, copper oxide, zinc oxide, cobaltosic oxide, nickel oxide and titanium oxide.
5. The surface plasmon-enhanced molecular device gas sensor of claim 4 wherein: the noble metal particles are gold, and the particle size of the noble metal particles is 20-80 nanometers.
6. The surface plasmon-enhanced molecular device gas sensor of any of claims 1-5, wherein: metal oxide particles are also provided on the metal oxide portion.
7. The surface plasmon-enhanced molecular device gas sensor of claim 6 wherein: the material of the metal oxide particles is different from the material of the metal oxide portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010431005.5A CN111537473A (en) | 2020-05-20 | 2020-05-20 | Surface plasmon enhanced molecular device gas sensor |
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| CN202010431005.5A CN111537473A (en) | 2020-05-20 | 2020-05-20 | Surface plasmon enhanced molecular device gas sensor |
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| CN111537473A true CN111537473A (en) | 2020-08-14 |
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| CN202010431005.5A Withdrawn CN111537473A (en) | 2020-05-20 | 2020-05-20 | Surface plasmon enhanced molecular device gas sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533300A (en) * | 2021-07-22 | 2021-10-22 | 岭南师范学院 | Graphene plasmon gas sensor and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533300A (en) * | 2021-07-22 | 2021-10-22 | 岭南师范学院 | Graphene plasmon gas sensor and manufacturing method thereof |
| CN113533300B (en) * | 2021-07-22 | 2022-06-21 | 岭南师范学院 | Graphene plasmon gas sensor and manufacturing method thereof |
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