Synthesis of In2O3-ZnO core-shell nanowires and their application in gas sensing

Year: 2011

Authors: Singh N., Ponzoni A., Gupta R.K., Lee P.S., Comini E.

Autors Affiliation: Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore;
Univ Brescia, I-25133 Brescia, Italy;
CNR IDASC, I-25133 Brescia, Italy

Abstract: Heteronanostructures are very promising gas sensor materials due to their high surface area and hybrid properties. In2O3-ZnO core-shell nanowires are synthesized via two-step growth process. The as-deposited shell is made up of grainy polycrystalline ZnO coated on the single crystalline In2O3 core. The sensing properties of pristine In2O3 and In2O3-ZnO core-shell nanowires are investigated for different gases. In2O3-ZnO core-shell nanowires are found to possess better response towards the CO, H-2 and ethanol while pristine In2O3 nanowires has shown a superior response towards the NO2. The high sensitivity and dynamic repeatability have shown in these sensors reveal that the core-shell nanowires are promising as sensitive and reliable chemical sensors. The gas sensing mechanism of these heterostructured nanowires is discussed in detail. (C) 2011 Elsevier B.V. All rights reserved.

Journal/Review: SENSORS AND ACTUATORS B-CHEMICAL

Volume: 160 (1)      Pages from: 1346  to: 1351

More Information: We thank Nicola Poli for his technical support during device fabrication. N. Singh acknowledges the research scholarship provided by Nanyang Technological University, Singapore.
KeyWords: Core-shell nanowires; Nanowire network; Polycrystalline; Gas sensor; Sensitivity
DOI: 10.1016/j.snb.2011.09.073

Citations: 128
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