Polythiophene-WO3 hybrid architectures for low-temperature H2S detection

Shouli Bai, Kewei Zhang, Jianhua Sun, Dongfeng Zhang, Ruixian Luo, Dianqing Li, Chungchiun Liu

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83 Scopus citations


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 WO 3 was further modified with polythiophene through in-situ polymerization of the adsorbed thiophene monomers on the surface of WO 3 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 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.

Original languageEnglish
Pages (from-to)142-148
Number of pages7
JournalSensors and Actuators, B: Chemical
StatePublished - 5 Jul 2014


  • p-n junction
  • Polythiophene


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