Nano

SKKU Advanced Institute of Nano Technology (성균관대학교 성균나노과학기술원)
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Vertically Aligned WO3-CuO Core-Shell Nanorod Arrays for Ultrasensitive NH3 Detection

  • Yan, Wenjun (Smart City Research Center of Zhejiang Hangzhou Dianzi University) ;
  • Hu, Ming (School of Microelectronics, Tianjin University)
  • Received : 2018.03.21
  • Accepted : 2018.09.14
  • Published : 2018.10.31
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Abstract

Vertically aligned $WO_3$-CuO core-shell nanorod arrays for $NH_3$ sensing are prepared. The sensor is fabricated by preparing $WO_3$-CuO nanorod arrays directly on silicon wafer with interdigital Pt electrodes. The $WO_3$-CuO nanorod arrays are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The sensor based on the vertically aligned $WO_3$-CuO nanorod arrays exhibits ultrasensitive $NH_3$ detection, indicating p-type behavior. The optimum sensing temperature is found to be about $150^{\circ}C$. Both response and recovery time to $NH_3$ ranging from 50 ppm to 500 ppm are around 10-15 s. A possible $NH_3$ sensing mechanism of the vertically aligned hybrid nanorod arrays is proposed.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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