Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 197, Issue -, Pages 142-148Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.02.038
Keywords
Polythiophene; WO3 architecture; p-n junction; H2S sensor
Funding
- National Natural Science Foundation of China [51372013, 21177007]
- Beijing Natural Science Foundation [8112022]
- Beijing Laboratory of Environmentally Harmful Chemicals Analysis
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This paper describes the low-temperature detection of hydrogen sulphide (H2S) using sensors based on organic-inorganic hybrids. Nanosheet-assembled WO3 architectures were prepared by a facile hydrothermal strategy using citric acid as capping agent. The resultant WO3 was further modified with polythiophene through in-situ polymerization of the adsorbed thiophene monomers on the surface of WO3 framework. The morphology, structure and thermal stability of obtained polythiophene-WO3 (PT-WO) hybrids were investigated in detail by FESEM, XRD, FT-IR, XPS and TG analysis. It is proved that there is a strong bonding interaction between PT and WO3 due to the electron transfer from S to W. Gas-sensing tests show that the PT-WO hybrids exhibit high response, good selectivity and fast recovery to ppm-level H2S at low operating temperature of 70 degrees C. The improvement of gas-sensing performance is attributed to the formation of p-n junction at the interface between organic PT and inorganic WO3. (C) 2014 Elsevier B.V. All rights reserved.
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