Volume 3, No. 3, September, 2015
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Low Temperature H2S Gas Sensor Based on Fe2O3 Modified ZnO-TiO2 Thick Film

R. B. Pedhekar 1, F. C. Raghuwanshi 2, and V. D. Kapse 3
1. G. H. Raisoni College of Engineering & Management, Amravati 444701, India
2. Vidya Bharati Mahavidhyalay, Amravati 444602, India
3. Arts, Science & Commerce College, Chikhaldara 444807, India
Abstract: Nanocrystalline ZnO-TiO2 (~ 49-56 nm) was synthesized by hydrothermal method. Thick films were prepared by using synthesized nanocrystalline ZnO-TiO2 (with molar ratio 9:1, 7:3 and 1:1) and their
gas sensing characteristics were investigated at different operating temperature. ZnO-TiO2 thick film (with molar ratio 7:3) exhibited good response to H2S as compared to other investigated compositions. Further, ZnO-TiO2 thick films (with molar ratio 7:3) were modified by different concentrations of Fe2O3 and their H2S
sensing characteristics were investigated. The 0.2M Fe2O3 modified ZnO-TiO2 thick film (with molar ratio 7:3)
exhibited excellent H2S sensing characteristics such as, high response (~ 314.67 at 40 oC), quick response
time (~ 8 s), less recovery time (~ 30 s), excellent repeatability and stability, good selectivity towards H2S as compared to the other test gases like CO2, LPG and NH3 at 40 oC. The experimental results demonstrated that the Fe2O3 modified ZnO-TiO2 Thick film is a very promising material to fulfills the practical requirement for the fabrication of H2S sensors with good sensing characteristics.

Key words: Nanocrystalline, ZnO-TiO2; Fe2O3, gas sensor, H2S.

Cite: R. B. Pedhekar, F. C. Raghuwanshi, and V. D. Kapse, "Low Temperature H2S Gas Sensor Based on Fe2O3 Modified ZnO-TiO2 Thick Film," International Journal of Materials Science and Engineering, Vol. 3, No. 3, pp. 219-230, September 2015. doi: 10.17706/ijmse.2015.3.3.219-230

General Information

ISSN: 2315-4527 (Print)
Abbreviated Title: Int. J. Mater. Sci. Eng.
Editor-in-Chief: Prof. Emeritus Dato' Dr. Muhammad Yahaya
DOI: 10.17706/ijmse
Abstracting/ Indexing: Ulrich's Periodicals Directory, Google Scholar, Crossref
E-mail: ijmse@iap.org