Controlling TiO photocatalytic behaviour perhydropolysilazane-derived SiO ultrathin shell

This study addresses the inherent photocatalytic activity of pure titanium dioxide (TiO 2 ), which limits its application as an industrial pigment. To mitigate this issue, a core-shell structure was employed, where TiO 2 cores were encapsulated within SiO 2 shells. Perhydropolysilazane (PHPS) was in...

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Veröffentlicht in:Nanoscale 2024-12, Vol.16 (47), p.2196-21969
Hauptverfasser: Burak, Darya, Han, Jae Hyun, Han, Joon Soo, Kim, In Soo, Rahman, Md Abdur, Yang, Joel K. W, Cho, So-Hye
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Zusammenfassung:This study addresses the inherent photocatalytic activity of pure titanium dioxide (TiO 2 ), which limits its application as an industrial pigment. To mitigate this issue, a core-shell structure was employed, where TiO 2 cores were encapsulated within SiO 2 shells. Perhydropolysilazane (PHPS) was introduced as a superior SiO 2 precursor over tetraethylorthosilicate (TEOS), resulting in thinner and more uniform SiO 2 shells. Utilizing TiO 2 's photocatalytic properties, hydroxyl radicals facilitated the conversion of PHPS into SiO 2 via native Si-H bonds, eliminating the need for additional reducing agents. The formation of PHPS-derived TiO 2 @SiO 2 core-shell nanoparticles demonstrated inherent self-limiting behaviour, ensuring uniform shell thickness regardless of PHPS concentration, simplifying the process for large-scale industrial applications compared to TEOS, which demands precise parameter control. Photocatalytic evaluations highlighted significant passivation of TiO 2 photocatalytic activity by PHPS-derived TiO 2 @SiO 2 core-shell particles and TiO 2 /SiO 2 thin films. Specifically, TiO 2 @PHPS nanoparticles achieved 89-96% passivation compared to 30% with TiO 2 @TEOS, while TiO 2 /PHPS films degraded only 12% of Eosin B versus 80% with TiO 2 films. Moreover, both PHPS-derived nanoparticles and films maintained TiO 2 's inherent high whiteness and high-refractive-index optical properties, underscoring their suitability for applications in white paint production, cosmetics, and high-refractive-index coatings. PHPS was transformed via TiO 2 photocatalytic properties into ultrathin SiO 2 shells, passivating TiO 2 activity while retaining its whiteness and high refractive index-perfect for cosmetics, paints, and optical coatings.
ISSN:2040-3364
2040-3372
DOI:10.1039/d4nr03566f