Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 213, Issue -, Pages 322-328Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.02.084
Keywords
Colorimetric oxygen sensing; Graphene oxide; TiO2 nanoparticles; Methylene blue; UV activation
Funding
- National Research Foundation (NRF) via the National Leading Research Laboratory [NRF-2013R1A2A1A05005468]
- Intelligent Synthetic Biology Center of Global Frontier RD Project [2011-0031957]
- Agriculture Research Center Program of the Ministry of Agriculture, Food and Rural Affairs [ARC-710003-03]
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea Government Ministry of Trade, Industry and Energy [20133030000300]
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We first report on the synthesis of graphene oxide-wrapped TiO2 nanoparticles (GO-TiO2 NPs) as a self-adhesive photocatalyst for UV-activated colorimetric oxygen detection. Methylene blue (MB), a redox dye for colorimetric oxygen indication, strongly adsorbed onto GO-TiO2 NPs by both electrostatic and pi-pi stacking interactions. The chemical attraction between GO and MB significantly decreased dye leakage, which is a serious problem of colorimetric oxygen indicators; MB leaching from GO-TiO2-based film was fivefold lower than that from conventional TiO2-based film. This novel MB/GO-TiO2/glycerol/hydroxyethyl cellulose film was successfully bleached by UV irradiation, and it regained its blue color rapidly in the presence of oxygen, demonstrating its useful functionality as a UV-activated colorimetric oxygen indicator. (C) 2015 Elsevier B.V. All rights reserved.
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