Graphene-based ternary composite film gas sensor and preparation method thereof

A gas sensor, alkenyl ternary technology, applied in the direction of material electrochemical variables, etc., can solve the problems of high price, low specific capacitance value, low conductivity, etc., and achieve the effect of low cost, enhanced system structure, and excellent performance

Active Publication Date: 2014-07-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure conductive polymers are generally insulators, and a single material has problems such as low conductivity, low specific capacitance, and high price.

Method used

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  • Graphene-based ternary composite film gas sensor and preparation method thereof
  • Graphene-based ternary composite film gas sensor and preparation method thereof
  • Graphene-based ternary composite film gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of single-layer composite film gas sensor

[0035] The gold interdigitated electrode is used as the sensor substrate, and its structure schematic diagram is as follows: figure 1 shown. Preparation of reduced graphene oxide (rGO) / tin dioxide (SnO) on the surface of interdigitated electrodes 2 ) / polyaniline (PANI) ternary composite film gas sensor, the specific implementation steps are as follows:

[0036] 1. Place the gold interdigitated electrode in acetone, ethanol, and deionized water in sequence for 15 minutes;

[0037] 2. For hydrophilic treatment, place the substrate in a mixed solution (1:1:5) of ammonia, hydrogen peroxide, and deionized water, and heat it to 70°C for 1 hour;

[0038] 3. Perform electrostatic treatment, place the interdigitated electrodes after hydrophilic treatment in PDDA and PSS solutions in turn, and keep them for 10 minutes respectively;

[0039] 4. Add 15 mg of graphene and 15 mg of tin dioxide mixed powder into...

Embodiment 2

[0045] Example 2 Preparation of single-layer self-assembled composite thin film gas sensor

[0046] The gold interdigitated electrode is used as the sensor substrate, and its structure diagram is as follows figure 1 shown. Preparation of reduced graphene oxide (rGO) / tin dioxide (SnO) on the surface of interdigitated electrodes 2 ) / polyaniline (PANI) ternary monolayer composite thin film gas sensor, the specific implementation steps are as follows:

[0047] 1. The gold interdigitated electrode was placed in acetone, ethanol, and deionized water for 15min in sequence;

[0048] 2. After hydrophilic treatment, the substrate was placed in a mixed solution (1:1:5) of ammonia water, hydrogen peroxide and deionized water, and heated to 70 °C for 1 h;

[0049] 3. Perform electrostatic treatment, and place the hydrophilic-treated interdigital electrodes in PDDA and PSS solutions in turn for 10 min respectively;

[0050] 4. In 50 ml of 1M HCl solution, 15 mg of graphene and 15 mg...

Embodiment 3

[0054] Example 3 Preparation of layered thin film gas sensor

[0055] 1. The gold interdigitated electrode was placed in acetone, ethanol, and deionized water for 15min in sequence;

[0056] 2. After hydrophilic treatment, the substrate was placed in a mixed solution (1:1:5) of ammonia water, hydrogen peroxide and deionized water, and heated to 70 °C for 1 h;

[0057] 3. Perform electrostatic treatment, and place the hydrophilic-treated interdigital electrodes in PDDA and PSS solutions in turn for 10 min respectively;

[0058] 4. Add 10mg graphene powder to 10ml, 1M HCl solution for sufficient ultrasonic and magnetic stirring to prepare graphene dispersion;

[0059] 5. Using the gas spraying process, the spraying height is 20cm, adding 1ml of the above graphene dispersion to the airbrush, placing the interdigital electrode in the central effective area, and evenly spraying the graphene dispersion on the interdigital electrode;

[0060] 6. 15 mg of tin dioxide mixed pow...

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Abstract

The invention discloses a graphene-based ternary composite film gas sensor and a preparation method thereof. The graphene-based ternary composite film gas sensor consists of a ternary composite film and a substrate, wherein the ternary composite film is formed by compounding graphene, metal or metal oxide nanoparticles and conducting polymers. The high specific surface area and excellent electric and physicochemical characteristics of the graphene and the nanoparticles and the specific gas-sensitive response characteristic of the conducting polymers are fully utilized, a gain complementary mechanism is formed between different materials due to ternary compounding, and the gas-sensitive characteristic and stability of the system are enhanced. Meanwhile, the preparation method is combined with a self-assembling process with high ordering property and can be used for preparing the high-sensitivity room temperature detection gas sensor.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials and gas sensors, in particular to a graphene-based ternary composite film gas sensor and a preparation method thereof. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. 2 The hybrid orbitals form a planar thin film of hexagonal honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. The appearance of graphene has stirred up huge waves in the scientific community. Its extraordinary electrical conductivity, excellent mechanical and optical properties and other characteristics have made graphene trigger a new round of revolution in the field of modern electronic science. Graphene has great advantages as a gas sensor. First, graphene is a two-dimensional material, and all carbon atoms are exposed to adsorbed gas molecules, which means that it can provide the largest sensitive area in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 太惠玲叶宗标蒋亚东何应飞郭宁杰谢光忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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