Photocatalysis of titanium dioxide-carbon nanotube composites with reversible superhydrophobicity and superhydrophilicity (Conference Presentation)

Ta-I Yang; Shi-Hui Hong; Yu-Jhen Lin; I-Hsiang Tseng

doi:10.1117/12.2260389

11 May 2017 Photocatalysis of titanium dioxide-carbon nanotube composites with reversible superhydrophobicity and superhydrophilicity (Conference Presentation)

Ta-I Yang, Shi-Hui Hong, Yu-Jhen Lin, I-Hsiang Tseng

Author Affiliations +

Proceedings Volume 10167, Nanosensors, Biosensors, Info-Tech Sensors and 3D Systems 2017; 101670N (2017) https://doi.org/10.1117/12.2260389
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

Abstract

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).

Conference Presentation

Citation Download Citation

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 (11 May 2017); https://doi.org/10.1117/12.2260389

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KEYWORDS

Composites

Titanium dioxide

Ultraviolet radiation

Photocatalysis

Titanium

Carbon nanotubes

Crystals

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