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J Colloid Interface Sci. 2018 Aug 1;523:217-225. doi: 10.1016/j.jcis.2018.03.109. Epub 2018 Mar 30.

Hierarchical assembly of urchin-like alpha-iron oxide hollow microspheres and molybdenum disulphide nanosheets for ethanol gas sensing.

Author information

1
College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China. Electronic address: dzzhang@upc.edu.cn.
2
College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China.
3
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: yangaijun@mail.xjtu.edu.cn.

Abstract

In this paper, we fabricated a high-performance ethanol sensor using layer-by-layer self-assembled urchin-like alpha-iron oxide (α-Fe2O3) hollow microspheres/molybdenum disulphide (MoS2) nanosheets heterostructure as sensitive materials. The nanostructural, morphological, and compositional properties of the as-prepared α-Fe2O3/MoS2 heterostructure were characterized by X-ray diffraction (XRD), energy dispersive spectrometer (EDS), scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), which confirmed its successful preparation and rationality. The α-Fe2O3/MoS2 nanocomposite sensor shows good selectivity, excellent reproducibility, fast response/recovery time and low detection limit towards ethanol gas at room temperature, which is superior to the single component of α-Fe2O3 hollow microspheres and MoS2 nanosheets. Furthermore, the response of the α-Fe2O3/MoS2 nanocomposite sensor as a function of ethanol gas concentration was also demonstrated. The enhanced ethanol sensing properties of the α-Fe2O3/MoS2 nanocomposite sensor were ascribed to the synergistic effect and heterojunction between the urchin-Like α-Fe2O3 hollow microspheres and MoS2 nanosheets. This work verifies that the hierarchical α-Fe2O3/MoS2 nanoheterostructure is a potential candidate for fabricating room-temperature ethanol gas sensor.

KEYWORDS:

Ethanol gas; Hierarchical heterostructure; Layer-by-layer self-assembly; MoS(2) nanosheets; α-Fe(2)O(3) hollow microspheres

PMID:
29626759
DOI:
10.1016/j.jcis.2018.03.109

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