Titanium dioxide- carbon nanotube (TiO2-CNT) composites are promising for application of photocatalysis. Therefore, the aim of this study is to develop a TiO2-CNTcomposite with reversible superhydrophobicity and superhydrophilicity for use in self-cleaning application.
The amount of TiO2 precursor, the added water, and the reaction time were systematically studied to obtain a TiO2 layer with desired thickness coated on the surface of CNT. In addition, the heat-treatment was utilized to control the crystalline structure of TiO2 and the hydrophobicity and hydrophilicity of resulting TiO2-CNT composites. The photocatalytic activity of the developed composites was evaluated by the photodegradation of a methylene blue (MB) solution under the illumination of ultraviolet (UV) light at ambient temperature.
Experimental results demonstrated that a layer of anatase TiO2 with thickness of 21nm, 27nm, or 65nm was successfully coated on the surface of CNT. The resulting TiO2-CNT composites are superhydrophobic, which the water contact angles ranged from 143o to126o based on the thickness of TiO2 layers. After subjected to a UV light, they became hydrophilic with a water contact angle less than 50o . Furthermore, the water contact angle of these TiO2-CNT composites restored to their original values without UV exposure, confirming they were with reversible superhydrophobicity and superhydrophilicity. Moreover, the developed TiO2-CNT composites also exhibited the capability of photocatalytic degradation of methylene blue (MB).
Ta-I Yang, Shi-Hui Hong, Yu-Jhen Lin, and I-Hsiang Tseng, "Photocatalysis of titanium dioxide-carbon nanotube composites with reversible superhydrophobicity and superhydrophilicity (Conference Presentation)," Proc. SPIE 10167, Nanosensors, Biosensors, Info-Tech Sensors and 3D Systems 2017, 101670N (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 27, 2017; Published: 11 May 2017); https://doi.org/10.1117/12.2260389.5427412082001.
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