Reduced Graphene Oxide−TiO2 Nanotube Composite: Comprehensive Study for Gas-Sensing Applications

Year: 2018

Authors: Galstyan V., Ponzoni A., Kholmanov I., Natile M. M., Comini E., Nematov S., Sberveglieri G.

Autors Affiliation: Department of Information Engineering, University of Brescia, Via Valotti 9, 25133 Brescia, Italy; CNR, National Institute of Optics, Via Branze 45, 25123 Brescia, Italy; Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States; CNR, Institute of Condensed Matter Chemistry and Technologies for Energy, Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131 Padova, Italy; The Tashkent State Technical University, Universitetskaya 2, 100069 Tashkent, Uzbekistan

Abstract: Graphene oxide (GO) and reduced graphene oxide (RGO) have unique properties that can revolutionize the performances of functional devices. Graphene-based materials can be coupled with metal oxide nanomaterials for gas-sensing applications. In this work, we report the synthesis and gas-sensing properties of a composite material based on RGO-loaded TiO2 nanotubes. To properly tune the reduction of GO to RGO, we adopted a gas-phase process that can be applied in situ on each gas sensor device, allowing one to track the process effects through sensor conductance. We systematically investigated the gas-response dependence from the RGO loading and its reduction, showing the occurrence of an optimal RGO concentration arising from the interplay of these two parameters. Hence, these two factors should be considered in parallel to functionalize the metal oxide materials with GO for the fabrication of chemical sensor devices.


Volume: 1 (12)      Pages from: 7098  to: 7105

KeyWords: graphene oxide; reduced graphene oxide; reduction effect; TiO2 nanotube; gas sensing
DOI: 10.1021/acsanm.8b01924

Citations: 39
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