期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 266, 期 -, 页码 52-62出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.03.007
关键词
Tin disulfide; Layer-by-layer assembly; Complex impedance spectroscopy; Humidity sensing
资金
- National Natural Science Foundation of China [51777215]
- Fundamental Research Funds for the Central Universities of China [18CX07010A]
- Science and Technology Development Plan Project of Qingdao [16-6-2-53-nsh]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2017B03]
An ultrahigh-performance impedance-type humidity sensor based on tin disulfide (SnS2)/titanium dioxide (TiO2) nanocomposite was demonstrated via layer-by-layer self-assembly technique in this work. The nanostructures, morphologies, composition properties of the SnS2/TiO2 nanocomposite were fully examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The humidity sensing characteristics of the SnS2/TiO2 film sensor were investigated at room temperature. The results show that the SnS2/TiO2 film sensor has an impedance response up to 200050 and a sensitivity of 442000 Omega/%RH, which is much better than that of the existing humidity sensors. Excellent stability and repeatability are also exhibited for the SnS2/TiO2 film sensor. Moreover, the underlying sensing mechanism for the SnS2/TiO2 sensor toward humidity was explored with the complex impedance spectroscopy and the Bode diagram. The SnS2/TiO2 nanocomposite provides a promising building block for ultrahigh-sensitive humidity sensing and detection of human respiratory. (C) 2018 Elsevier B.V. All rights reserved.
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