Self-assembled and Pd decorated Zn2SnO4/ZnO wire-sheet shape nano-heterostructures networks hydrogen gas sensors

SENSORS AND ACTUATORS B-CHEMICAL

卷:195

Article

Wang, Bing^1,2  Zheng, Zhao Qiang¹  Zhu, Lian Feng³  Yang, Yu Hua⁴  Wu, Huan Yu¹ 

[1] Shenzhen Univ, Coll Elect Sci & Technol, Shenzhen Key Lab Micro Nano Photon Informat Techn, Shenzhen 518060, Guangdong, Peoples R China

[2] Shenzhen Univ, Shenzhen Key Lab Sensor Technol, Shenzhen 518060, Guangdong, Peoples R China

[3] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

[4] Sun Yat Sen Univ, Sch Phys & Engn, Nanotechnol Res Ctr, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

关键词: Gas sensor;    Nano-hete rostructures;    Zn2SnO4;    ZnO;    Self assembled;    Hydrogen sensor;   

DOI  :  10.1016/j.snb.2014.01.073

来源: Elsevier

【 摘 要 】

Zn2SnO4/ZnO wire-sheet shape hetero-nanostructures (Zn2SnO4/ZnO HNS) networks gas sensors have been fabricated on Cr comb-shaped interdigitating electrodes with relatively narrower interspace of 1.5 mu m using thermal evaporation of the mixed powders of ZnO, SnO2 and active carbon with Au catalysts. The self-assembly grown sensors of Zn2SnO4/ZnO HNS networks have excellent gas sensing characteristics to hydrogen concentration ranging from 2 to 1000 ppm at operating temperature of 120-300 degrees C. Comparing with Zn2SnO4/ZnO HNS networks sensors, the Pd decorated Zn2SnO4/ZnO HNS (Pd-Zn2SnO4/ZnO HNS) networks sensors exhibit enhanced hydrogen sensing performance such as higher response (74% at 255 degrees C to 1000 ppm H-2), less response time (15s at 270 degrees C to 1000 ppm H-2), better selectivity (response to H-2, C2H5OH, CH4, C2H2, CO, and C3H8), lower adsorption activation energy (12.72 kj/mol to 1000 ppm H-2) and smaller deviation from the ideal value of power exponent beta (0.49623 at 255 degrees C). The enhanced sensing properties of the Pd-Zn2SnO4/ZnO HNS can be ascribed to an additional depletion layer at the interface between Pd nanoparticles and Zn2SnO4/ZnO HNS. Both sensors show fine long-term stability during exposure to 2-1000 ppm H-2 under relatively high operating temperature of 120-300 degrees C in 50 days. (C) 2014 The Authors. Published by Elsevier B.V. All rights reserved.

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