Zinc oxide nanowire-graphene gas sensor and preparation method thereof

A zinc oxide nanowire, gas sensor technology, applied in the direction of material resistance, can solve the problems of poor selectivity and low sensitivity

Active Publication Date: 2016-01-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single graphene as a sensor still has a series of bottlenecks, including low sensitivity and poor selectivity. Therefore, it is necessary to combine graphene wi

Method used

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  • Zinc oxide nanowire-graphene gas sensor and preparation method thereof
  • Zinc oxide nanowire-graphene gas sensor and preparation method thereof
  • Zinc oxide nanowire-graphene gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 0.1 g of zinc oxide nanowires and 0.1 g of polyvinylpyrrolidone in 30 ml of deionized water, and sonicate for 15 minutes to obtain the first solution. 0.3 g of graphene was dissolved in 30 ml of deionized water, and the second solution was obtained by ultrasonication for 15 min. The two solutions were mixed and stirred for 1 h, centrifuged for 3 times and then dried in a vacuum oven at 50° C. for 24 h to obtain a zinc oxide nanowire-graphene oxide composite material.

[0029] The obtained zinc oxide nanowire-graphene oxide composite material was annealed under argon protection, the annealing temperature was 300° C., and the annealing time was 30 min, to obtain the zinc oxide nanowire-graphene composite material. The powder of the composite material was added to deionized water at a concentration of 1 mg / L, and ultrasonically treated at 40KHz for 10 minutes, so that the composite material was uniformly dispersed in the deionized water, thereby obtaining a disper...

Embodiment 2

[0036] The steps are as in Example 1, the mass percentage of zinc oxide nanowires in the zinc oxide nanowire-graphene composite material is reduced from 25% to 10%, and the response value of the gas sensor to 50ppm concentration ammonia is reduced to 6.2%. .

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Abstract

The invention discloses a zinc oxide nanowire-graphene gas sensor and a preparation method thereof, and belongs to the technical field of gas detection. The gas sensor consists of a substrate, an interdigital electrode and a gas sensitive coating, wherein the gas sensitive coating is made of a zinc oxide nanowire-graphene composite material. The preparation process of the sensor comprises the following steps: (1) preparing the zinc oxide nanowire-graphene nano-composite material; (2) machining and preparing the interdigital electrode on the substrate by a micromachining method and covering the surface of the interdigital electrode with a layer of nano-composite material serving as the gas sensitive coating to form a sensing device. The lower detection limit of the gas sensor to ammonia gas under room temperature reaches 50 ppb; meanwhile, the gas senor is shorter in response time, higher in repeat stability and higher in gas selectivity. The gas sensor is suitable for performing high-sensitivity detection on the ammonia gas under the room temperature.

Description

technical field [0001] The invention relates to a gas sensor and a preparation method thereof, in particular to a zinc oxide nanowire-graphene gas sensor and a preparation method thereof, belonging to the technical field of gas detection. Background technique [0002] The development of new sensors with high sensitivity and fast response is of great significance to environmental monitoring, people's health, military defense and so on. However, the highly sensitive detection of ammonia at room temperature has high economic and environmental value. With the development of nanotechnology, gas sensors based on nanomaterials have made great progress. Among them, metal oxide semiconductor nanomaterials and graphene have been used to construct gas sensors. [0003] Among them, graphene has many advantages that conventional materials do not have due to its unique two-dimensional nanostructure: first, it has a large specific surface area, which can provide channels for gases, there...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 杨志孙震汤雪辉王涛魏浩张亚非
Owner SHANGHAI JIAO TONG UNIV
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