Nickel oxide nanowires growth by VLS technique for gas sensing application
Authors: Kaur N., Comini E., Poli N., Zappa D., Sberveglieri G.
Autors Affiliation: Univ Brescia, SENSOR Lab, Via D Valotti 9, I-25133 Brescia, Italy; CNR INO, I-25133 Brescia, Italy
Abstract: In this work, nickel oxide (NiO) nanowires have been synthesized on alumina substrate by vapor-liquid-solid (VLS) technique and were tested for alcohol sensing. RF magnetron sputtered gold particles were used as catalyst for the growth of NiO nanowires. Nanowire surface morphology was analyzed by using scanning electron microscopy (FE-SEM). Afterwards, a set of conductromertric sensing devices were prepared and mounted on TO packages using electro-soldered gold wires. The response of prepared sensors towards different gases such as acetone and ethanol was measured. The dynamic sensing phenomena and the calibration curves of NiO nanowire sensors exposed towards these gases were also studied in detail. The optimal working temperature of the sensors were found to be 500 degrees C for both the gases. (C) 2015 The Authors. Published by Elsevier Ltd.
KeyWords: Nickel oxide; Sputtering; Nanowires; Vapor-liquid-solid; Gas senosr