A bismuth oxide nanoplate-based carbon dioxide gas sensor

A carbon dioxide gas sensor based on wet-chemically synthesized beta-Bi2O3 nanoplates (width similar to 100-400 nm; length similar to 4-6 mu m) was investigated using repeatability and reproducibility tests. The saturation region for different gas concentrations, and the response and recovery times were also recorded. The beta-Bi2O3 nanoplate-based sensor has demonstrated lower operating temperature with a high gas response of 100%, which remained unchanged even up to 11,000 ppm CO2. The fast response and recovery times suggests these nanoplates can serve as excellent gas-sensing nanomaterial. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea government (MEST; Grant 2009-0092807). Authors wish to thank Mr. Ravindra Mene and Dr. R. S. Khairnar for making experimental facilities available