Conductance and work function of TiO2 nanotubes based gas sensors

Year: 2015

Authors: Galstyan V., Comini E., Baratto C., Mazhar M.E., Ponzoni A., Sberveglieri V., Poli N., Faglia G., Sberveglieri G.

Autors Affiliation: Sensor Lab, CNR, National Institute of Optics (INO), Via Valotti 9, Brescia, 25133, Italy; Sensor Lab, Department of Information Engineering, University of Brescia, Via Valotti 9, Brescia, 25133, Italy

Abstract: We studied growth process of TiO2nanotubes and investigated their gas sensing properties using two different approaches such as chemoresistive and Kelwin probe methods. The morphology and the crystal structure of the samples were analyzed using scanning electron microscopy and micro-Raman spectroscopy. Morphological analysis showed that well-aligned and highly ordered nanotubes were obtained by means of electrochemical anodization method. Structural investigations showed the nanotubes were crystallized in the anatase phase after the post-growth annealing. The functional properties of obtained structures were investigated towards different gases in a wide range of operating temperatures.

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More Information: Funding sponsor: RBAP115AYN. FP7-PEOPLE-2011-IRSES. 2012-2015. NMP3-LA-2010-246334. National Research Council, NRC. College of Natural Resources, University of California Berkeley, CNR. Regione Lombardia, 611887. European Commission, EC. The research leading to these results has received funding from the following projects: “New approaches and methodologies for bioremediation of water contaminated by chlorinated aliphatic solvents (SUSBIOREM)” (funded by the National Research Council (CNR) and Lombardia Region); “MSP: Multi Sensor Platform for Smart Building Management” (grant agreement n° 611887, funded by the European Commission through its 7th Framework Programme); “FIRB – Oxides at the nanoscale: multifunctionality and applications” (Protocollo: RBAP115AYN, funded by the Italian Ministry of Education); “ORAMA” (grant agreement NMP3-LA-2010-246334, funded by the European Commission through its 7th Framework Programme). “WIROX: Oxide Nanostructures for Wireless Chemical Sensing” (PEOPLE MARIE CURIE ACTIONS, International Research Staff Exchange Scheme, Call: FP7-PEOPLE-2011-IRSES, 2012-2015).
KeyWords: Chemical sensors; Crystal structure; Gas detectors; Ionization of gases; Scanning electron microscopy; Work function; Yarn, Electro-chemical anodization; Functional properties; Gas sensing properties; Micro Raman Spectroscopy; Morphological analysis; Operating temperature; Structural investigation; TiO, Nanotubes