1. Sol-gel derived TiO2–carbon composites with adsorption-enhanced photocatalytic activity and gas sensing performance
- Author
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Mingsong Wang, Chuanchuan Jin, Qiang Luo, and Eui Jung Kim
- Subjects
010302 applied physics ,Anatase ,Materials science ,Carbonization ,Process Chemistry and Technology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Adsorption ,Amorphous carbon ,Chemical engineering ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,Photocatalysis ,Molecule ,0210 nano-technology ,Sol-gel ,BET theory - Abstract
We report the in-situ sol-gel synthesis of TiO2–carbon composites (black TiO2) by carbonization of the gel. With ultra-fine anatase TiO2 nanoparticles dispersed homogeneously on amorphous carbon, the as-prepared black TiO2 possesses a BET surface area as high as 145.4 m2/g. Due to the synergy effect of adsorption and photocatalysis, the as-synthesized black TiO2 is demonstrated to exhibit enhanced photocatalytic activity. The gas sensing properties of black TiO2 have been rigorously investigated with and without UV illumination at room temperature. It is found that increased adsorption of gas molecules can effectively improve the sensor response. The mechanism of the adsorption-enhanced gas sensing performance of black TiO2 has been detailedly discussed.
- Published
- 2020
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