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Synthesis, Structure, and Ethanol Gas Sensing Properties of In2O3 Nanorods Decorated with Bi2O3 Nanoparticles
- Park, Sunghoon, Kim, Soohyun, Sun, Gun-Joo, Lee, Chongmu
- ACS applied materials 2015 v.7 no.15 pp. 8138-8146
- ethanol, gases, nanoparticles, nanorods, temperature
- Bi₂O₃-decorated In₂O₃ nanorods were synthesized using a one-step process, and their structure, as well as the effects of decoration of In₂O₃ nanorods with Bi₂O₃ on the ethanol gas-sensing properties were examined. The multiple networked Bi₂O₃-decorated In₂O₃ nanorod sensor showed responses of 171–1774% at ethanol concentrations of 10–200 ppm at 200 °C. The responses of the Bi₂O₃-decorated In₂O₃ nanorod sensor were stronger than those of the pristine-In₂O₃ nanorod sensors by 1.5–4.9 times at the corresponding concentrations. The two sensors exhibited short response times and long recovery times. The optimal Bi concentration in the Bi₂O₃-decorated In₂O₃ nanorod sensor and the optimal operation temperature of the sensor were 20% and 200 °C, respectively. The Bi₂O₃-decorated In₂O₃ nanorod sensor showed selectivity for ethanol gas over other gases. The origin of the enhanced response, sensing speed, and selectivity for ethanol gas of the Bi₂O₃-decorated In₂O₃ nanorod sensor to ethanol gas is discussed.