期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 7, 页码 6462-6471出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15669
关键词
molybdenum disulfide; layer-by-layer self-assembly; nanocomposite film; ammonia sensor; sensing mechanism; heterojunction
资金
- National Natural Science Foundation of China [51407200, 51405257]
- 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]
This article is the first demonstration of a molybdenum disulfide (MoS2)/tricobalt tetraoxide (Co3O4) nanocomposite film sensor toward NH3 detection. The MoS2/Co3O4 film sensor was fabricated on a substrate with interdigital electrodes via layer-by-layer self-assembly route. The surface morphology, nanostructure, and elemental composition of the MoS2/Co3O4 samples were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy. The characterization results confirmed its successful preparation and rationality. The NH3 sensing properties of the sensor for ultra-low-concentration detection were investigated at room temperature. The experimental results revealed that high sensitivity, good repeatability, stability, and selectivity and fast response/recovery characteristics were achieved by the sensor toward NH3. Moreover, the MoS2/Co3O4 nanocomposite film sensor exhibited significant enhancement in ammonia-sensing properties in comparison with the MoS2 and Co3O4 counterparts. The underlying sensing mechanisms of the MoS2/Co3O4 nanocomposite toward ammonia were ascribed to the layered nanostructure, synergistic effect, and heterojunction created at the interface of n-type MoS2 and p-type Co3O4. The synthesized MoS2/Co3O4 nanocomposite proved to be an excellent candidate for constructing high-performance ammonia sensor for various applications.
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