SnS2纳米片的制备及其对NO2气体的检测

doi:10.15541/jim20190133

摘要/Abstract

摘要：

二维金属硫化物材料具有较低的电子噪声以及极大的比表面积, 使其非常适合用作气敏材料, 因此寻求高效可控的方法制备二维金属硫化物材料是目前的研究热点。本研究使用高温化学浴法制备了不同形貌的高结晶二维六方SnS₂纳米片。采用不同手段对制备的SnS₂纳米片进行表征, 并进一步研究了SnS₂纳米片的气敏性能。结果显示: 油酸、油胺用量(体积)相同时, 产物SnS₂的形貌是均一的六角形纳米片, 其直径约150 nm, 厚度约4~6 nm。气敏测试表明该SnS₂纳米片对NO₂气体具有良好响应, 且响应过程可逆, 选择性好。其最佳工作温度为130 ℃, 响应和恢复时间分别为98和680 s。

关键词: 二氧化氮气体, 二维材料, SnS₂, 高温化学浴法, 气敏检测

Abstract:

Two-dimensional (2D) metal sulfide materials are ideal for use in gas sensing applications due to their low electronic noise and a large specific surface area, and the research on highly efficient and morphologically controllable methods for preparing two-dimensional metal sulfide materials is necessary. Highly crystalline 2D hexagonal SnS₂ nanoplates (NPs) with different morphologies were prepared by high temperature chemical bath method. SnS₂ NPs were characterized by different techniques, and their gas sensing properties were further investigated. The results show that when the molar ratio of oleic acid (OAc) to oleylamine (OAm) is 1 : 1, the shape of typical SnS₂ NPs is a uniform hexagon, with a diameter of about 150 nm and a thickness of 4-6 nm. The gas sensing test shows typical SnS₂ NPs are responsive to NO₂ gas, and the sensing process is reversible and selective. The optimal operating temperature is 130 ℃, and the response and recovery time are 98 and 680 s, respectively.

Key words: NO₂ gas, 2D materials, SnS₂, chemical bath synthesis, gas sensing detection

中图分类号:

TQ174

山巍,傅正钱,张发强,马名生,刘志甫,李永祥. SnS₂纳米片的制备及其对NO₂气体的检测[J]. 无机材料学报, 2020, 35(4): 497-504.

SHAN Wei,FU Zhengqian,ZHANG Faqiang,MA Mingsheng,LIU Zhifu,LI Yongxiang. SnS₂ Nanoplates: Synthesis and NO₂ Sensing Property[J]. Journal of Inorganic Materials, 2020, 35(4): 497-504.

图/表 9

Fig. 1 Diagram of chemical bath synthesis process of 2D SnS2 NPs

Fig. 2 (a) Schematic diagram of the device for gas sensing testing, and (b) circuit diagram of gas sensing test system

Fig. 3 (a) XRD pattern of typical SnS2 NPs, and (b) top and cross-sectional schematics of monolayer SnS2

Fig. 4 (a) SEM image of 2D SnS2 NPs; (b) TEM image of 2D SnS2 NPs, (c) cross-sectional HRTEM of 2D SnS2 NPs, (d) Zoomed-in HRTEM image, and (e) EDS spectrum of 2D SnS2 NPs

Fig. 5 FT-IR spectrum of reaction solution

Fig. 6 TEM images of SnS2 NPs with different molar ratio of OAc to OAm from 1 : 9 to 9 : 1 (a-i)

Fig. 7 Growth process of SnS2 NPs

Fig. 8 Response curves of sensors made of typical SnS2 NPs in the presence of 1×10-5 of NO2 gas at different operating temperatures

Fig. 9 (a) Dynamic sensing performance of SnS2 NPs toward NO2 gas at concentrations ranging from 20×10-6 to 0.5×10-6 at 130 ℃, and (b) three reversible test cycles of SnS2 NPs toward 10×10-6 NO2 at 130 ℃

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SnS₂纳米片的制备及其对NO₂气体的检测

SnS₂ Nanoplates: Synthesis and NO₂ Sensing Property

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