Based on hollow spherical sno 2 /ceo 2 Ethanol sensor and preparation method of heterostructure composite oxide
A composite oxide and heterostructure technology, which is applied in the direction of material resistance, can solve the problems of low sensitivity, etc., and achieve the effect of improving sensitivity, simple device process, and broad application prospects
Active Publication Date: 2018-02-09
JILIN UNIV
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Problems solved by technology
Although using SnO 2 Research work on gas sensors as sensitive materials has been widely reported, however, most of them are based on SnO 2 gas sensors have low sensitivity
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Embodiment 1
[0039] hollow spherical SnO 2 / CeO 2 Heterostructure compound oxide semiconductor materials are used to make ethanol sensors, and the specific manufacturing process is as follows:
[0040] 1. First mix ethanol and deionized water at a ratio of 10:1 to form a 33mL solution, and then add 0.19g of SnCl to it 2 2H 2 O and 0.5mL of 38% hydrochloric acid with a mass fraction of 30°C for 20min;
[0041] 2. Transfer the above solution to a reaction kettle with a volume of 40mL, react at 200°C for 24 hours, and after cooling to room temperature, wash the formed precipitate with deionized water and ethanol several times, and then dry it at room temperature before putting it in Calcined at 400 °C for 2 hours, thus obtained the SnO 2 Hollow spherical SnO assembled from nanoparticles 2 ; The hollow spherical SnO 2 The particle size ranges from 300 to 500nm, the wall thickness is 100nm, and the structure is relatively uniform. Product mass was 120 mg.
[0042] 3. Take 30mg of the ab...
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Abstract
The invention belongs to the technical field of semiconductor oxide gas sensor, and specifically relates to a hollow spherical SnO2 / CeO2 heterostructural composite oxide ethanol gas sensor and a preparation method thereof. A hollow spherical SnO2 / CeO2 heterostructural composite oxide sensitive material prepared through a two-step hydrothermal method is used. With utilization of a heterostructure formed between SnO2 and CeO2 and synergistic catalysis action of SnO2 and CeO2 on ethanol, the gas sensitive characteristic of the sensor on ethanol is effectively improved. In addition, the adopted sensor structure is composed of a commercially available Al2O3 insulation ceramic tube with two annular gold electrodes, a semiconductor sensitive material coating the annular gold electrodes and the Al2O3 insulation ceramic tube, and a nickel-chromium alloy heating coil passing through the Al2O3 insulation ceramic tube. The ethanol gas sensor is simple in device process, small in size and suitable for mass production, thereby having broad application prospects in detection of the ethanol content.
Description
technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, in particular to a sensor based on hollow spherical SnO 2 / CeO 2 Ethanol gas sensor of heterostructure composite oxide and its preparation method. Background technique [0002] Ethanol is a basic industrial raw material. With the development of science and technology, ethanol has been widely used in food processing, medicine, industrial production, etc. Since ethanol is volatile and flammable, the content of ethanol can be quantified and quickly determined. Detection is a necessary condition to realize safety monitoring and optimal control of production process. On the other hand, with the improvement of people's living standards and the increase in the number of motor vehicles, traffic accidents caused by drunk driving occur frequently, seriously endangering road traffic safety and people's life and property safety. In order to effectively control drunk driving, it is ...
Claims
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IPC IPC(8): G01N27/12
Inventor 卢革宇刘江洋孙鹏梁喜双刘凤敏
Owner JILIN UNIV