Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 284, Issue -, Pages 202-212Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.12.119
Keywords
Heterostructure; Hollow spheres; P-n junction; Spillover effect; Gold
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 [16-5-1-92-jch, 17-1-1-81-jch]
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The rational design of heterostructures is highly important for innovative sensor technology to acquire efficient gas detection with optimized gas sensing properties. In the present work, a novel heterostructure of Au/Co3O4/W18O49 hollow spheres is constructed and applied for gas sensor application. The structure-property correlation has been studied by means of X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope and Transmission electron microscope, as well as comprehensive gas sensing tests. Experiments demonstrate that the Au/Co3O4/W18O49 heterostructure delivers outstanding performances in terms of high sensitivity, fast response-recovery, good selectivity, and very low limit of detection against pristine W18O49 and Co3O4/W18O49. Notably, a very high response (16.7) to 2 ppm triethylamine and a state-of-the-art limit of detection (81 ppb) are obtained. The superior gas sensing properties are attributed to a synergistic combination of the unique porous structure, the p-n heterojunctions between Co3O4/W18O49, and the catalytic spillover effect of Au nanoparticles.
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