期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 698, 期 -, 页码 476-483出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.12.222
关键词
Layer-by-layer self-assembly; MoS2/ZnO nanocomposite film; Ammonia gas sensor; Sensing mechanism
资金
- National Natural Science Foundation of China [51407200]
- Science and Technology Plan Project of Shandong Province [2014GSF117035]
- Fundamental Research Funds for the Central Universities of China [15CX05041A]
- Science and Technology Development Plan Project of Qingdao [16-6-2-53-nsh]
- Science and Technology Project of Huangdao Zone, Qingdao, China [2014-1-51]
A high-sensitivity ammonia gas sensor based on molybdenum disulfide/zinc oxide (MoS2/ZnO) nano-composite film was reported in this paper. The multilayered film of MoS2/ZnO was fabricated on a PCB substrate with interdigital electrodes (IDE) via layer-by-layer self-assembly technique. The surface morphology, nanostructure and elemental composition of the MoS2/ZnO nanocomposite were described by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that ZnO and MoS2 had good contact in terms of electric and structure. Ammonia-sensing properties of the sensor were investigated by exposing it to various concentrations of ammonia at room temperature. The experimental results revealed that the MoS2/ZnO nanocomposite film sensor exhibited ultra-high sensitivity, good repeatability, excellent stability, outstanding selectivity and fast response/recovery characteristics. Moreover, the sensing device exhibited significantly enhancement in ammonia gas sensing compared to the drop-casted pure ZnO and layer-by-layer self-assembled MoS2/polymer sensors. These results render the MoS2/ZnO nanocomposite a promising candidate for high-performance ammonia sensing at room temperature. The underlying sensing mechanisms of the MoS2/ZnO sensing device towards ammonia gas were ascribed to the excellent electrochemical properties and special nanostructure of the nanocomposite. (C) 2016 Elsevier B.V. All rights reserved.
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