Abstract
TiO2 hollow nanoparticles with tunable cavity size were prepared via a microwave-assisted hydrolysis reaction between TiCl4 and different amounts of HF aqueous solution, followed by calcination at 400 °C for 2 h. The obtained TiO2 hollow nanoparticles with tunable cavity size were characterized with TEM, SEM, XRD, Raman, BET, UV–vis absorption spectra, and photocurrent measurement. It was found that the tunable cavity size of TiO2 hollow nanoparticles was apparently enlarged from 1 to 3 nm to 7–9 nm by increasing the content of HF, and that HF also plays a crucial role in the crystallization of TiO2. The TiO2 hollow nanoparticles exhibit the unique cavity-size-dependent properties of UV absorption and photocatalytic activity for acetone degradation. This study offers a novel approach to fabricating TiO2 hollow nanoparticles with tunable cavity size, and the unique cavity-size-dependent photocatalytic property has potential for wide popularization and application prospects.
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