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QCM sensor based on tin sulfide-based material modification and preparation method thereof

A technology of tin sulfide and base materials, which is applied in material weighing, analyzing materials, instruments, etc., can solve the problem of low detection limit, achieve fast response speed, enhance gas sensing performance, and low detection limit

Pending Publication Date: 2022-05-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional resistance sensor based on metal oxide modification requires an operating temperature of 200-400 °C in the process of detecting trimethylamine gas, which has many inconveniences in practical applications.
[0004] At present, tin sulfide-based materials are mainly used in gas sensing for NO 2 , NO, CO 2 , CO and other inorganic gases, and the working temperature of pure stannous sulfide or tin disulfide material detection gas is usually above 100 ℃ and the detection limit is not low enough

Method used

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  • QCM sensor based on tin sulfide-based material modification and preparation method thereof
  • QCM sensor based on tin sulfide-based material modification and preparation method thereof
  • QCM sensor based on tin sulfide-based material modification and preparation method thereof

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Effect test

Embodiment 1

[0025] The tin sulfide-based material of the present embodiment is prepared by the following method:

[0026] (1) Add 2.2565g of stannous chloride dihydrate into 80mL of ultrapure water, and ultrasonically disperse for 20min to obtain a pure white suspension; add 0.3757g of thioacetamide powder to the above mixed solution, and ultrasonically disperse for 20min; mix the obtained The solution was transferred to a 100mL para-polyphenylene reactor, and reacted at 220-240°C for 24h to obtain a black-gray precipitate.

[0027] (2) The black-gray precipitate obtained in step (1) was centrifuged at 7500 rpm by a centrifuge, and ultrapure water was added for shaking and then centrifuged and washed. After repeated washing three times, the washed precipitate was placed in a -80°C refrigerator for freezing for 6 days. Then, freeze-dried at -48°C and 50Pa vacuum conditions for 12-14h and then frozen overnight to obtain tin sulfide-based materials.

Embodiment 2

[0029] The preparation method of the tin sulfide-based material of the present embodiment is different from the embodiment 1 in that: 2.2565 g of stannous chloride dihydrate is added to 80 mL of ultrapure water, and ultrasonically dispersed for 20 min to obtain a pure white suspension; step In (1), 0.7513g of thioacetamide powder was added to the mixed solution, and ultrasonically dispersed for 20min to obtain a white mixed solution; the obtained mixed solution was transferred to a 100mL para-polyphenylene reactor and reacted at 220~240°C After 24h, a black-gray precipitate was obtained.

Embodiment 3

[0031] The preparation method of the tin sulfide-based material of the present embodiment is different from the embodiment 1 in that: 2.2565 g of stannous chloride dihydrate is added to 80 mL of ultrapure water, and ultrasonically dispersed for 20 min to obtain a pure white suspension; step In (1), 1.5026g of thioacetamide powder was added to the mixed solution, and ultrasonically dispersed for 20min to obtain a light beige mixed solution; the obtained mixed solution was transferred to a 100mL para-polyphenylene reactor, at 220~240°C After 24 hours of reaction, a black-gray precipitate was obtained.

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Abstract

The invention relates to the field of gas sensors, and discloses a QCM sensor based on tin sulfide-based material modification and a preparation method thereof. The preparation method of the QCM sensor comprises the following steps: firstly, synthesizing tin sulfide-based materials with different tin-sulfur molar ratios by adopting a solvothermal method, and modifying the surface of a QCM gold electrode with a dispersion liquid of the tin sulfide-based materials by adopting a dispensing method, so as to construct the QCM sensor modified by the tin sulfide-based materials. The obtained QCM sensor can detect trimethylamine gas in a certain concentration range at room temperature, and has good selectivity and high sensitivity.

Description

technical field [0001] The invention relates to a preparation method of a gas sensor, in particular to a QCM sensor modified based on a tin sulfide base material and a preparation method thereof. Background technique [0002] Two-dimensional materials are widely used in the fields of lithium batteries, gas sensing, pyroelectricity, photodetectors, and photocatalysts due to their unique characteristics such as large specific surface area, layered structure, and high conductivity. Tin sulfide-based materials are mainly divided into stannous sulfide (SnS) and tin disulfide (SnS) 2 )Material. As a kind of two-dimensional material, stannous sulfide material is an inexpensive, low-toxicity p-type semiconductor, its structure is similar to that of black phosphorus, its direct band gap and indirect band gap are between 1.0-1.3 eV, and it has a large absorption coefficient , high carrier concentration, strong electron mobility and so on. The two-dimensional tin disulfide material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00G01N5/02
CPCG01N5/00G01N5/02
Inventor 王俊周芩安韦真博王永维
Owner ZHEJIANG UNIV
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