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Cadmium sulfide/zinc oxide nuclear shell nanowire nitrogen dioxide sensing material and preparation method thereof

A core-shell nano-sensing material technology, applied in zinc oxide/zinc hydroxide, cadmium sulfide, nanotechnology, etc., can solve the problems of obvious photoelectric response and narrow CdS band gap.

Active Publication Date: 2015-05-13
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CdS has narrow bandgap, obvious photoelectric response and stable photocurrent.

Method used

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  • Cadmium sulfide/zinc oxide nuclear shell nanowire nitrogen dioxide sensing material and preparation method thereof
  • Cadmium sulfide/zinc oxide nuclear shell nanowire nitrogen dioxide sensing material and preparation method thereof
  • Cadmium sulfide/zinc oxide nuclear shell nanowire nitrogen dioxide sensing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. The raw materials cadmium nitrate and thiourea are dissolved in the solvent ethylenediamine at a molar ratio of 1:2. After the raw materials are dissolved, the solution is transferred to a Teflon hydrothermal kettle, reacted at a temperature of 160°C for 12 h, and cooled to room temperature;

[0022] b. Filter the resulting yellow precipitate, wash it with absolute ethanol and deionized water until no ethylenediamine remains, and dry it in vacuum at a temperature of 25°C for 4 hours to obtain a dry product;

[0023] c. Take 0.1 g of the dried product, add it to 60 mL of deionized water, ultrasonicate for 30 min to make it fully dispersed, then add 0.026 g of zinc acetate and 0.025 g of hexamethylenetetramine, stir evenly, and transfer to Teflon In a dragon water hot kettle, react at a temperature of 70°C for 6h, and cool to room temperature;

[0024] d. Filter the resulting yellow precipitate, wash it with deionized water until no hexamethylenetetramine remains, and...

Embodiment 2

[0027] a. The raw materials cadmium nitrate and thiourea are dissolved in the solvent ethylenediamine at a molar ratio of 1:4. After the raw materials are dissolved, the solution is transferred to a Teflon hydrothermal kettle, reacted at a temperature of 200°C for 72 hours, and cooled to room temperature;

[0028] b. Filter the resulting yellow precipitate, wash it with absolute ethanol and deionized water until no ethylenediamine remains, and dry it in vacuum at 85°C for 4 hours to obtain a dried product;

[0029] c. Take 1.0 g of the dried product, add it to 60 mL of deionized water, ultrasonicate for 30 min to make it fully dispersed, then add 0.52 g of zinc acetate and 0.5 g of hexamethylenetetramine, stir evenly, and transfer to Teflon In a dragon water hot kettle, react at a temperature of 150°C for 15 h, and cool to room temperature;

[0030] d. Filter the resulting yellow precipitate, wash it with deionized water until no hexamethylenetetramine remains, and dry it in ...

Embodiment 3

[0033] a. The raw materials cadmium nitrate and thiourea are dissolved in the solvent ethylenediamine at a molar ratio of 1:3. After the raw materials are dissolved, the solution is transferred to a Teflon hydrothermal kettle, reacted at a temperature of 180°C for 48 hours, and cooled to room temperature;

[0034] b. Filter the resulting yellow precipitate, wash it with absolute ethanol and deionized water until no ethylenediamine remains, and dry it in vacuum at 65°C for 4 hours to obtain a dry product;

[0035] c. Take 0.35 g of the dried product, add it to 60 mL of deionized water, ultrasonicate for 30 min to make it fully dispersed, then add 0.052 g of zinc acetate and 0.05 g of hexamethylenetetramine, stir well, and transfer to Teflon In a dragon water hot kettle, react at a temperature of 120°C for 12 h, and cool to room temperature;

[0036] d. Filter the resulting yellow precipitate, wash it with deionized water until no hexamethylenetetramine remains, and dry it in v...

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Abstract

The invention relates to a cadmium sulfide / zinc oxide nuclear shell nanowire nitrogen dioxide sensing material and a preparation method thereof. In the sensing material, the nuclear is CdS, the shell is ZnO, the crystal forms of the CdS and ZnO are both hexagonal wurtzites and are compounded by a hydrothermal method, a CdS / ZnO nuclear shell nanowire is used as NO2 sensing material, light with certain intensity reaches the sensing material, and light resistance change of the sensing material is measured when NO2 is adsorbed to the surface of the sensing material, thus reaching an NO2 sensing target; the measuring signal is for indicating the light resistance change of the sensing material or the voltage and current changes in the circuit, caused by the light resistance change; and the sensing material has the advantages of low working temperature, wide temperature response range, high sensitivity and high detection limit.

Description

technical field [0001] The invention relates to a CdS / ZnO core-shell structure nanowire NO 2 The sensing material and its preparation method specifically relate to a resistive sensing material composed of CdS / ZnO core-shell nanowires, based on the calibration of the resistance change of the CdS / ZnO core-shell nanowire sensing material at working temperature, to realize to NO 2 detection. Background technique [0002] NO 2 It is an air pollutant of high concern and an important factor in the formation of acid rain. Frequent exposure to high concentrations of NO 2 In the gaseous environment, it can cause respiratory system diseases. Vehicle exhaust emissions, industrial dye combustion, and production of nitric acid-nitrogenous fertilizers all contribute to NO in the surrounding environment. 2 Concentration increases. At the same time, in some special occasions, it is necessary to 2 For real-time monitoring, such as the nitro oxidant commonly used in spacecraft propella...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12C01G11/02C01G9/02B82Y30/00B82Y40/00
Inventor 郭亚楠杨政窦新存祖佰祎郭林娟
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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