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Chin. Phys. B, 2014, Vol. 23(5): 058103    DOI: 10.1088/1674-1056/23/5/058103
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Synthesis and room-temperature NO2 gas sensing properties of a WO3 nanowires/porous silicon hybrid structure

Zeng Peng (曾鹏), Zhang Ping (张平), Hu Ming (胡明), Ma Shuang-Yun (马双云), Yan Wen-Jun (闫文君)
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China
Abstract  We report on the fabrication and performance of a room-temperature NO2 gas sensor based on a WO3 nanowires/porous silicon hybrid structure. The W18O49 nanowires are synthesized directly from a sputtered tungsten film on a porous silicon (PS) layer under heating in an argon atmosphere. After a carefully controlled annealing treatment, WO3 nanowires are obtained on the PS layer without losing the morphology. The morphology, phase structure, and crystallinity of the nanowires are investigated by using field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD), and high-resolution transmission electron microscopy (HRTEM). Comparative gas sensing results indicate that the sensor based on the WO3 nanowires exhibits a much higher sensitivity than that based on the PS and pure WO3 nanowires in detecting NO2 gas at room temperature. The mechanism of the WO3 nanowires/PS hybrid structure in the NO2 sensing is explained in detail.
Keywords:  gas sensing      WO3 nanowires      porous silicon      hybrid structure  
Received:  29 August 2013      Revised:  30 September 2013      Accepted manuscript online: 
PACS:  81.07.-b (Nanoscale materials and structures: fabrication and characterization)  
  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
  61.46.-w (Structure of nanoscale materials)  
  73.40.Lq (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61271070, 61274074, and 60771019) and the Key Research Program of Application Foundation and Advanced Technology of Tianjin, China (Grant No. 11JCZDJC15300).
Corresponding Authors:  Hu Ming     E-mail:  huming@tju.edu.cn
About author:  81.07.-b; 07.07.Df; 61.46.-w; 73.40.Lq

Cite this article: 

Zeng Peng (曾鹏), Zhang Ping (张平), Hu Ming (胡明), Ma Shuang-Yun (马双云), Yan Wen-Jun (闫文君) Synthesis and room-temperature NO2 gas sensing properties of a WO3 nanowires/porous silicon hybrid structure 2014 Chin. Phys. B 23 058103

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