Abstract
TiO2/In2O3 nanowire (NW) array are prepared using catalyst free glancing angle deposition technique. The wettability of TiO2/In2O3 NW surface are tuned and controlled by the annealing treatment without altering the surface with additional chemical coating. The phase change, surface roughness, change in static and dynamic contact angles due to the heat treatment are studied. Moreover, the surface properties such as frictional force and work of adhesion are calculated for all the samples. The samples annealed at 600 °C shows nearly superhydrophilic with static water contact angle of 12°, frictional force of 85.00748 µN and work of adhesion of 142.3721 mN/m. The surface of TiO2/In2O3 NW is controlled to attain desired water contact angles and sliding angles, which is paramount for designing practical application in self-cleaning, electronic and biomedical fields.
Highlights
TiO2/In2O3 nanowire (NW) array are prepared using catalyst free glancing angle deposition technique
There is no report on study of tuning the wettability of coaxial TiO2-In2O3 NW from hydrophobic to hydrophilic through simple heat treatment
The x-ray diffraction (XRD) peak intensities of In2O3 in TiO2-In2O3 NWs increased with the increase in annealing temperature
Summary
TiO2/In2O3 nanowire (NW) array are prepared using catalyst free glancing angle deposition technique. For samples annealed at 800 °C, the In2O3 crystallinity is decreased as peak intensities is decreased compared with samples annealed at 600 °C, where the grain stops growing or exhibits amorphous nature above 600 °C as reported[14,15]. The decrease in the roughness with the increase in annealing temperature is due to the increase in grain size and the grain agglomeration, which reduces the gaps between the NWs. at 800 °C the roughness of TiO2-In2O3 NW increases.
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