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Direct growth of titania nanotubes on plastic substrates and their application to flexible gas sensors

Title
Direct growth of titania nanotubes on plastic substrates and their application to flexible gas sensors
Authors
Jang, NS[Jang, Nam-Su]Kim, MS[Kim, Min Seong]Kim, SH[Kim, Soo-Hyung]Lee, SK[Lee, Soo-Keun]Kim, JM[Kim, Jong-Man]
DGIST Authors
Lee, SK[Lee, Soo-Keun]
Issue Date
2014-08
Citation
Sensors and Actuators, B: Chemical, 199, 361-368
Type
Article
Article Type
Article
Keywords
Anodization VoltagesAnodizationsCarbon MonoxideChemoresistive SensorsElectrical CurrentElectro-Chemical AnodizationElectrolyte TemperatureElectrolytesEthylene GlycolFlexible Gas SensorsGas DetectorsGasesNanotubesPlastic SubstratesSensorsTi Thin-Film AnodizationTitania NanotubesTitanium Dioxide
ISSN
0925-4005
Abstract
Titania nanotubes (TNTs) were directly synthesized on titanium thin-film deposited on plastic substrates by electrochemical anodization in ethylene glycol (EG)-based electrolyte containing ammonium fluoride (NH4F) and water (H2O). The effect of various anodization conditions such as growth time, H2O content in electrolyte, anodization voltage, and electrolyte temperature on the morphologies of resultant TNTs was investigated. It was found that the addition of moderate amount of H2O in electrolyte and subsequent HF treatment were beneficial to the formation of micrometer-long TNTs with open and regular tubular surfaces. After transition from amorphous to anatase phase by thermal annealing at 350 °C, the TNTs were employed as flexible chemoresistive sensors for detecting carbon monoxide (CO) and ammonia (NH3) gases. The gas sensing performance of the flexible TNT sensors was characterized by measuring the changes in electrical current due to exposure to test gases and the corresponding gas responses. The sensor responses were considerably stable and reversible even under repetitive gas exposure at different concentrations. In addition, the gas responses were also found to be linear with respect to different concentrations of test gases and fairly good even at relatively low concentration. © 2014 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/3065
DOI
10.1016/j.snb.2014.03.113
Publisher
Elsevier
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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