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Tailoring the textured surface of porous nanostructured NiO thin films for the detection of pollutant gases

  Articoli su Riviste JCR/ISI  (anno 2015)

Autori:  Kumar R., Baratto C., Faglia G., Sberveglieri G., Bontempi E., Borgese L

Affiliazione Autori:  CNR-INO SENSOR Lab., Via Branze 35, 25133 Brescia, Italy; University of Brescia, Dept. of Information Engineering, Via Valotti, 9, 25133 Brescia, Italy; INSTM and Chemistry for Technologies Laboratory, University of Brescia, Department of Mechanical and Industrial Engineering, Via Branze, 38, 25133 Brescia, Italy

Riassunto:  In the present article, an experimental approach to detect pollutant gases in presence of humidity was applied for gas sensors based on p-type NiO thin films. NiO thin films were deposited by radio frequency magnetron sputtering in inert atmosphere using a NiO target. Thin films were investigated by scanning electron microscopy to observe their surface morphology. Crystal structure and vibrational study were investigated by X-ray diffraction and micro-Raman spectroscopy, respectively. It was observed that deposition temperature played a crucial role in the structural and surface morphology of NiO thin films. Sensing response of the nanostructured thin films to reducing and oxidizing gas was studied as a function of gas concentration and operating temperature. A double digit (12.3) response was observed towards ozone at 200 degrees C, while maximum response to ethanol and acetone was recorded at 400 degrees C. A correlation was established between sensing response and crystalline dimension for ozone sensing. The result showed that NiO thin films can be used as p-type metal oxide material for the fabrication of solid state gas sensors to detect low concentrations of ozone (70 ppb). (C) 2015 Published by Elsevier B.V.

Rivista/Giornale:  Thin solid films (Print)
Volume n.:  583      Pagine da: 233  a: 238
Ulteriori informazioni:  The research leading to these results has received funding from the European Communities 7th Framework Programme under grant agreement NMP3-LA-2010-246334. Financial support of the European Commission is therefore gratefully acknowledged.
DOI: 10.1016/j.tsf.2015.04.004

*Impact Factor della Rivista: (2015) 1.761   *Citazioni: 22
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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