Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

被引：161

作者：

Wang, Junqiang ^{[1
]}

Li, Zhijie ^{[1
]}

Zhang, Sa ^{[1
]}

Yan, Shengnan ^{[1
]}

Cao, Baobao ^{[2
]}

Wang, Zhiguo ^{[1
]}

Fu, Yongqing ^{[3
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Phys Elect, Chengdu 610054, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China

[3] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2018年 / 255卷

基金：

英国工程与自然科学研究理事会;

关键词：

CeO2; Gas sensor; Silica; Hydrothermal; NH3; PHOTOCATALYTIC ACTIVITY; LEVEL DETECTION; THIN-FILM; SENSITIVITY; NANOPARTICLES; CO; TEMPERATURE; IRRADIATION; SELECTIVITY; FABRICATION;

D O I：

10.1016/j.snb.2017.08.149

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The silica modified CeO2 gas sensing nanomaterials are synthesized using a sol-hydrothermal route. The 8%silica-CeO2 has larger specific surface areas of 83.75 m(2)/g and smaller crystalline size of 11.5 nm than pure CeO2, respectively. Compared to pure CeO2, the 8%silica-CeO2 based gas sensor exhibits significant enhancement NH3 gas-sensing performance. At room temperature, it shows much better gas response of 3244% to 80 ppm of NH3 gas and lower detection limit (0.5 ppm) towards NH3 gas. It is also found that the gas response of the NH3 gas sensors increases linearly with the increase of NH3 gas concentration. Moreover, the NH3 gas sensor have good reversibility, stability and selectivity. The reason of enhanced NH3 gas-sensing performance is not only because of the increased specific surface areas, but also due to the electrolytic conductivity of NH4+ and OH-on the surface. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：862 / 870

页数：9

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