Graphene-based gas sensitive sensor material loaded with metal palladium and preparation and application thereof

Abstract

The invention relates to a graphene-based gas sensitive sensor material loaded with a metal palladium and a preparation and an application. The preparation comprises the following steps of: pre-oxidizing the graphene, and then performing oxidation treatment; reducing the oxidized graphene to reduced graphene oxide by an one-step reduction method; and simultaneously loading the metal palladium on the surface layer of the reduced graphene oxide to obtain a graphene-based gas sensitive sensor material. The graphene-based gas sensitive sensor material has excellent hydrogen sensing properties, exhibits 23% sensitivity to 1000 ppm hydrogen gas under normal-temperature and oxygen-free environment, and exhibits far better selectivity than other gases. The sensing material has a very wide application prospect due to the characteristics of being capable of operating in a normal-temperature and oxygen-free environment and high selectivity.

Description

technical field [0001] The invention belongs to the preparation and application of a semiconductor-type hydrogen sensor, in particular to a metal palladium-supported graphene-based gas-sensing sensing material and its preparation and application. Background technique [0002] Hydrogen is a common combustible gas. It is not only a common industrial raw material gas in production and life, but also a new type of secondary energy that is valued at present. It is widely used in petrochemical, electronic industry, metallurgy due to its unique physical and chemical properties Industry, food processing, float glass, fine organic synthesis, aerospace and other fields. However, hydrogen has a wider explosion range (4-75%) and lower ignition energy (0.019mJ) than other combustible gases. At the same time, due to the small molecular structure and light gas density of hydrogen, the possibility of leakage in actual production and life is higher. Therefore, in order to prevent the occur...

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Problems solved by technology

Since most of the above chemical reactions involve the adsorption of oxygen species in the environment, most sensors can only be used in aerobic environments, and are difficult to apply in anaerobic environments.

[0005] 2) Some semiconductor metal oxide materials (such as SnO2 materials) cannot directly work in the air at room temperature, and need to use direct heat or side heat to assist their work, which not only increases the energy consumption of the sensing element, but also fluctuates the heat source Influenced by external factors, it will further affect the working stability of the sensor

[0006] 3) Most semiconductor metal oxide materials (such as TiO2, ZnO materials), due to their intrinsic properties as semiconductor materials, lead to a very large body resistance, which will increase the overall device resistance in the subsequent development of circuit modules and instruments. Matching Difficulty, Hardware Cost and Test Accuracy

[0007] 4) Semiconductor metal oxide materials have excellent catalytic performance, which makes them widely used as gas-sensing sensing materials, but due to the limitations of the material itself, the gas selectivity of semiconductor sensors in practical applications is limited. Not good, it will be interfered by similar oxidizing gases, reducing gases and organic vapors, which will affect the accuracy

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