Titanium Dioxide Nanostructures Chemical Sensor. (2016)

• Record Type: Journal Article
• Authors: Bertuna, A.; Comini, E.; Poli, N.; Zappa, D.; Sberveglieri, G.
• Is Part Of: Procedia engineering. Volume 168(2016)
• Page Start: 313
• Page End: 316
• Publication Date: 2016
• Subjects: Titanium dioxide -- nanostructures -- hydrothermal treatment -- chemical sensor -- Raman spectroscopy; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2016.11.204
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: Titanium dioxide (TiO2 ) nanostructures were grown directly on the sensitive area of the transducer. A titanium thin film was deposited on 2 · 2 mm 2 alumina substrates by RF magnetron sputtering and hydrothermal method was used to achieve TiO2 . This method is characterized by the use of different solutions (KOH, NaOH), a not stirred pressure reactor and a heating system. As-prepared samples require an acid treatment followed by a calcination step to obtain pure TiO2 nanostructures. The nanostructured morphology was confirmed by a scanning electron microscope (SEM) and their structural properties were investigated by RAMAN spectroscopy. Obtained samples were used as gas sensors, and their behaviour towards several gaseous species was analysed in a wide range of working temperatures. Measurements were carried out in a test chamber, investigating the change in the electrical conductance due to the surrounding atmosphere.