Synthesis method of sensitive material for formaldehyde gas sensor
A technology for sensitive materials and formaldehyde gas, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of zero drift, poor selectivity, low response sensitivity, etc., to reduce internal resistance and prevent grain growth. The effect of large, unobstructed electronic channels
Inactive Publication Date: 2020-05-08
苏州麦茂思传感技术有限公司
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Therefore, the current formaldehyde semiconductor gas sensor has low response sensitivity and poor selectivity, and there is still zero point drift after long-term use
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[0028] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0029] see figure 1 and figure 2
[0030] A kind of synthetic method of formaldehyde gas sensor sensitive material, comprises the steps:
[0031] Step 1: Print a metal tin layer on the ceramic sheet printed with fork-teeth electrodes, and anneal the printed metal tin layer to obtain a tin oxide thin layer;
[0032] Step 2: Ultrasonic the ceramic sheet, wash it with deionized water and ethanol for several times, and dry it, so that the surface microstructure of the tin oxide thin layer is uneven tin oxide particles, which can be used as seeds for the growth of tin oxide nanowires layer;
[0033] Step 3: Place the ceramic sheet in the reactor ...
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The invention relates to the technical field of gas detection, and discloses a synthesis method of a sensitive material for a formaldehyde gas sensor. The synthesis method comprises the following steps: printing a metallic tin layer on a ceramic chip printed with an interdigital electrode, and carrying out annealing treatment; carrying out ultrasonic treatment, carrying out repeated cleaning by using deionized water and ethanol, and then carrying out drying; putting the ceramic chip into a reaction kettle for a hydrothermal reaction; immersing a grown tin oxide precursor into a mixed solutionof fresh hydrogen peroxide H2O2 (30 wt%) and ammonia monohydrate NH3.H2O (25 wt%), washing the tin oxide precursor with distilled water, and drying the tin oxide precursor in air; carrying out constant-temperature annealing on a nanowire array in an oxygen-enriched environment; and finally, cooling rutile type tin dioxide nanometer SnO2NW to the room temperature. By means of such a manner, more active sites can be provided, the response value of the sensor is greatly improved, the corresponding long-term stability of the sensitive material is guaranteed, and the binding force of the sensitivematerial can be improved to a large extent.
Description
technical field [0001] The invention relates to the technical field of gas detection, in particular to a synthesis method of a formaldehyde gas sensor sensitive material. Background technique [0002] The source of indoor air pollution is largely from furniture pollution. Interlayer glue, carpets, paints, and most plastic products in newly installed furniture will release small organic molecule gases (VOCs), which contain a large number of VOCs that are easy to cause human Disease of formaldehyde gas. In this regard, the World Health Organization and China's environmental protection administrative department have established corresponding formaldehyde emission standards. Therefore, in recent years, people's demand for formaldehyde detection market, especially formaldehyde detection equipment with high selectivity and high sensitivity is also increasing. [0003] At present, the sensitive materials of formaldehyde gas sensors are mostly zinc oxide and tin dioxide as sensiti...
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Login to View More IPC IPC(8): C04B41/87C01G19/02G01N27/12
CPCC04B41/87C04B41/505G01N27/127C01G19/02C01P2004/61
Inventor 井华谷文陈红林张珽
Owner 苏州麦茂思传感技术有限公司