Abstract
The wettability-switching properties of superhydrophobic/hydrophilic surfaces have generated significant interest to researchers worldwide. Controlling the wettability on the surface holds considerable promise for potential applications like self-cleaning surfaces, anti-freezing, and anti-corrosion. Switching wettability is still a challenging issue in research field. In this work, we have synthesized gold (Au)-decorated TiO2 nanowire (NW) and analyzed the switching wettability behavior under specific UV light conditions. The wettability test result displays the water contact angle (WCA) of Au-decorated TiO2-NW and TiO2-NW as 122° and 70°, respectively. After the UV irradiation, WCA of the Au-decorated TiO2-NW and TiO2-NW changed to 47° and 43°, the wettability transition rate obtained was 2.3 × 10–4 degree−1 min−1 and 1.5 × 10–4 degree−1 min−1, respectively. The value of friction force and work of adhesion of Au-decorated TiO2-NW is 14.10 µN and 34.22 mN/m. Improved switching wettability behavior has been observed for Au-decorated TiO2-NW compared to TiO2-NW sample. This improvement is due to effective carrier separation and enhanced lifetime of charge carriers. Hence the enhanced wettability parameters in Au-decorated TiO2-NW structure can provide a great potential application in self-cleaning and antifogging smart surfaces.
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Acknowledgements
The authors would like to thank and acknowledge the SAIF, Indian Institute of Technology Bombay for providing the FEG-SEM and EDX facility, SAIF and North-Eastern Hill University Shillong for providing TEM and SAED facility, Department of Chemistry of National Institute of Technology Nagaland for FTIR facility, Department of Electronics and Communication of National Institute of Technology Nagaland, for water contact angle measurement, and TEQIP-III and NIT Nagaland for financial assistance.
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Kashyap, K.K., Hazarika, M., Dhayal, S.S. et al. Synthesis of metallic surface plasmon-sensitized TiO2 nanowire for wettability application. J Mater Sci: Mater Electron 33, 8674–8682 (2022). https://doi.org/10.1007/s10854-021-06770-0
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DOI: https://doi.org/10.1007/s10854-021-06770-0