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HomeKey Engineering MaterialsKey Engineering Materials Vol. 934Spray Pyrolyzed Praseodymium Doped SnO2 Thin Film...

Spray Pyrolyzed Praseodymium Doped SnO2 Thin Film with Fast Response to LPG: Analysis Based on Microstructural Features

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Abstract:

Praseodymium (Pr) doped (0.1 to 6 wt. %) nanostructured SnO₂ thin films are prepared via nebulizer assisted spray deposition process at a deposition temperature of 320 °C. The analyses show that the films grow in (110), (301) and (310) preferred orientations. The fabricated sensing films are exposed to LPG at 500 ppm concentration and at different operating temperatures. In 500 ppm of LPG, at an operating temperature of 350 °C, a commendable sensor response of 99 % with fast response time of 9 s and recovery time of 11 s is shown by 1wt.% Pr doped film, which is appreciable compared to pristine SnO₂ film. The sensor response reduces at lower operating temperatures. Microstructural investigations justify the gas sensing performance of 1 wt.% Pr doped SnO₂ thin film. Raman and photoluminescence studies give an insight into oxygen vacancies and trapped states that have a crucial influence on gas sensing.

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Periodical:

Key Engineering Materials (Volume 934)

Pages:

23-36

DOI:

https://doi.org/10.4028/p-shh9bt

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Online since:

November 2022

Authors:

S. Deepa*, Prasanna Kumari Krishnan, Boben Thomas

Keywords:

LPG Sensor, Praseodymium, SnO₂, Spray Pyrolysis, Thin Film

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© 2022 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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