Nickel oxide nanowires: vapor liquid solid synthesis and integration into a gas sensing device

Year: 2016

Authors: Kaur N., Comini E., Zappa D., Poli N., Sberveglieri G.

Autors Affiliation: Univ Brescia, SENSOR Lab, Via D Valotti 9, I-25133 Brescia, Italy; CNR, INO, Via D Valotti 9, I-25133 Brescia, Italy

Abstract: In the field of advanced sensor technology, metal oxide nanostructures are promising materials due to their high charge carrier mobility, easy fabrication and excellent stability. Among all the metal oxide semiconductors, nickel oxide (NiO) is a p-type semiconductor with a wide band gap and excellent optical, electrical and magnetic properties, which has not been much investigated. Herein, we report the growth of NiO nanowires by using the vapor liquid solid (VLS) technique for gas sensing applications. Platinum, palladium and gold have been used as a catalyst for the growth of NiO nanowires. The surface morphology of the nanowires was investigated through scanning electron microscopy to find out which catalyst and growth conditions are best for the growth of nanowires. GI-XRD and Raman spectroscopies were used to confirm the crystalline structure of the material. Different batches of sensors have been prepared, and their sensing performances towards different gas species such as carbon monoxide, ethanol, acetone and hydrogen have been explored. NiO nanowire sensors show interesting and promising performances towards hydrogen.

Journal/Review: NANOTECHNOLOGY

Volume: 27 (20)      Pages from: 205701-1  to: 205701-9

KeyWords: nickel oxide; nanowires; gas sensing; scanning electron microscope; vapor liquid solid method; Raman spectroscopy
DOI: 10.1088/0957-4484/27/20/205701

Citations: 43
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