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Vertically Aligned WO3–CuO Core–Shell Nanorod Arrays for Ultrasensitive NH3 Detection
Wenjun Yan,Ming Hu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.10
Vertically aligned WO3–CuO core–shell nanorod arrays for NH3 sensing are prepared. The sensor is fabricated by preparing WO3–CuO nanorod arrays directly on silicon wafer with interdigital Pt electrodes. The WO3–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 WO3–CuO nanorod arrays exhibits ultrasensitive NH3 detection, indicating p-type behavior. The optimum sensing temperature is found to be about 150 ℃. Both response and recovery time to NH3 ranging from 50 ppm to 500 ppm are around 10–15 s. A possible NH3 sensing mechanism of the vertically aligned hybrid nanorod arrays is proposed.