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 |
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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. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/d4nr03566f |