Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 288, Issue -, Pages 432-441Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.015
Keywords
Tungsten oxide; Heterojunction; Hollow spheres; alpha-Fe2O3; Interface
Funding
- National Natural Science Foundation of China [21601098, 51602167]
- Shandong Provincial Science Foundation [ZR2016EMB07, ZR2017JL021]
- Key Research and Development Program [2018GGX102033]
- Qingdao Applied Fundamental Research Project [17-1-1-81-jch, 16-5-1-92-jch]
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Heterostructures of metal oxide semiconductors present great potential for chemical sensor devices due to the fascinating properties endowed by the multiple materials and the heterointerface. In the present work, W18O49/alpha-Fe2O3 hollow heterostructures with different alpha-Fe2O3 contents are prepared by a hydrothermal method. The chemical composition and structure properties are characterized by multiple techniques. The gas sensing study demonstrates that the W18O49/alpha-Fe2O3 hollow heterostructures exhibit superior sensing performances toward acetone against pure W18O49. The composite containing 6.3 wt% alpha-Fe2O3 delivers the best sensor response and fast response-recovery speed (10 and 31 s), good selectivity, and low limit of detection (86 ppb). The superior gas sensing performance is interpreted by the functions of porous hollow structure and heterojunctions when introducing alpha-Fe2O3. This work provides a novel structure design for synthesis of high performances gas sensing materials for ppb-level acetone detection.
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