Preparation method of nitric oxide gas sensor element based on pseudodirected tungsten trioxide nano tape

Abstract

The invention discloses a preparation method of a nitric oxide gas sensor element based on a pseudodirected tungsten trioxide nano tape, which comprises the steps of: 1, preparing a tungsten hexachloride solution; 2, regulating the mol concentration of tungsten hexachloride to be 0.003-0.012M; 3, synthesizing a pseudodirected tungsten oxide nano wire; 4, preparing a pseudodirected tungsten oxide nano wire; 5, preparing a sensitive material slurry; and 6, preparing the sensor element based on the pseudodirected tungsten trioxide nano tape. The sensor element based on the pseudodirected tungsten trioxide nano tape, prepared by using the method, has the advantages of high sensitivity, high selectivity, low working temperature and low power consumption for the low-concentration nitric oxide gas detection.

Description

technical field [0001] The invention relates to a nitrogen oxide gas sensor, in particular to a method for preparing a nitrogen oxide gas sensor element based on a quasi-aligned tungsten trioxide nanobelt. Background technique [0002] The development of modern industry has produced a large amount of flammable, explosive, toxic and harmful gases, among which nitrogen oxides (NO X ) is a typical air pollutant that can cause serious environmental problems such as acid rain and photochemical smog, and pose a huge threat to human health. Research for NO X High-performance gas sensor materials and devices for accurate detection and monitoring are of great significance to the protection of the environment and human health. Semiconducting metal oxides are a class of NO X The gas-sensing material with good sensitivity performance, its gas-sensing mechanism belongs to the surface resistance control type, and the detection of gas is based on the modulation process of the surface re...

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Problems solved by technology

However, for this type of quasi-one-dimensional tungsten oxide nanostructure-based gas sensor, its NO X Sensitive performance still has a lot of room for improvement, because the optimal operating temperature of this type of sensor is still relatively high, usually around 200°C, and the high operating temperature brings high power consumption; moreover, this type of sensor is sensitive to low concentrations of nitrogen The sensitivity of oxide gases is still low. For example, ReitArtzi-Gerlitz et al. (ReitArtzi-Gerlitz et al. sensors and Actuators B 2009, 136: 257) used template-assisted deposition of tungsten oxide nanotubes and investigated its effect on NO 2 Sensitivity response to gas, found that tungsten oxide nanotubes are sensitive to 0.2ppm NO at 200℃ 2 The sensitivity is about 4; Zhifu Liu et al. (Zhifu Liu, et al.sensors and Actuators B 2009, 140:514) reported that the tungsten oxide nanorod microsphere material is sensitive to 1ppmNO at 200℃ 2 The maximum sensitivity of tungsten oxide nanowires synthesized by solvothermal synthesis (Yuxiang Qin et al. sensors and Actuators B, 150: 339, 2010) on the NO 2 The study of gas sensitivity characteristics shows that at 200 ° C, tungsten oxide nanowires are sensitive to 1ppm NO 2 The sensitivity is only 13.4. Therefore, there is still a big gap between the sensitivity performance of the current quasi-one-dimensional tungsten oxide nanostructure and the current high-performance requirements for low-power, high-sensitivity, and integrated nitrogen oxide sensors.

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