Metal clusters activated SnO2 thin film for low level detection of NH3 gas

被引：115
作者：
Shahabuddin, Md. [1 ]
Sharma, Anjali [1 ]
Kumar, Jitendra [2 ]
Tomar, Monika [3 ]
Umar, Ahmad [4 ,5 ]
Gupta, Vinay [1 ]
机构：
[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India
[2] Jamia Millia Islamia, Dept Phys, New Delhi 110025, India
[3] Univ Delhi, Dept Phys, Delhi 110007, India
[4] Najran Univ, Promising Ctr Sensors & Elect Devices, Najran 11001, Saudi Arabia
[5] Najran Univ, Ctr Adv Mat & Nanores CAMNR, Najran 11001, Saudi Arabia
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2014年 / 194卷
关键词：
SnO2; Chemisorption; Sensitivity; Spill over; AMMONIA SENSING PERFORMANCES; SENSOR; WO3; SURFACE; SENSITIVITY; POWDERS;
D O I：
10.1016/j.snb.2013.12.097
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this communication, the fabrication of NH3 gas sensor based on SnO2 thin films modified with metallic clusters (MCs) has been reported. Amongst all the MCs (Pt, Pd, Cr, Au, Cu and In), the integration of Pt MCs of thickness 8 nm and 200 pin diameter onto surface of SnO2 thin film exhibit a high sensing response (similar to 25.7) with a fast response time (similar to 1 s) towards 450 ppm NH3 at an operating temperature of 230 degrees C. Pt MCs activate the spill over mechanism for NH3 gas molecules and enhance its interaction with uncovered SnO2 surface. The structural and surface morphology of SnO2 film have been studied and a correlation between the high degree of response behaviour of sensor and highly nanoporous active sensing element is identified. Sensor operation was also tested and showed a good selectivity towards ammonia over acetone, LPG, methane, TCE, NOx, IPA, chloroform and CO2. The Pt/SnO2 sensor was tested for repeated cycles and no significant deterioration in the sensing response was observed and sensor was found to be completely reversible operation for a long span of time. The simple and low-cost sensor structure shows the promising results for the practical realization in NH3 sensing. (C) 2013 Elsevier B.V. All rights reserved.
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收藏
页码：410 / 418
页数：9
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