Kelvin probe as an effective tool to develop sensitive p-type CuO gas sensors

Year: 2016

Authors: Mazhar M.E., Faglia G., Comini E., Zappa D., Baratto C., Sberveglieri G.

Autors Affiliation: SENSOR, Università degli Studi di Brescia – Dipartimento di Ingegneria dell’InformazioneVia Branze 38 & INO-CNR UOS di Brescia, Via Branze 45,I-25123 Brescia, Italy

Abstract: We present a comparative study of gas sensing properties of p-type CuO nanowires, characterized by Kelvin Probe (KP) surface workfunction gas sensing and formal conductometric (chemoresistive) gas sensing schemes, with main emphasis on the detection performance of low concentrations of butanol. P-type CuO nanowires were prepared by thermal oxidation of Cu thin film in a controlled environment at oxidation temperatures of 300 degrees C and 400 degrees C. Structural characterizations of grown nanomaterials were carried out by X-ray diffraction, micro-Raman spectrophotometry and scanning electron microscopy (SEM). Butanol sensing responses recorded from both methods were compared and further analyzed to calculate approximate values of electron affinity variations.


Volume: 222      Pages from: 1257  to: 1263

More Information: This work is partly supported by European project “ORAMA “Oxide Materials Towards a Mature Post-silicon Electronics Era”, NMP-2009-2.2.1, “WIROX” Oxide Nanostructures for Wireless Chemical Sensing, PEOPLE MARIE CURIE ACTIONS, International Research Staff Exchange Scheme, Call: FP7-PEOPLE-2011-IRSES, 2012-2015, as well as by European Community
KeyWords: Butanol sensing; Conductometric sensing; CuO nanowires; Electron affinity; Kelvin probe; P-type metal oxides; Surface workfunction
DOI: 10.1016/j.snb.2015.05.050

Citations: 35
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