Design of nanoscaled heterojunctions in precursor-derived t-ZrO2/SiOC(N) nanocomposites: Transgressing the boundaries of catalytic activity from UV to visible light

Shakthipriya Bhaskar; Eranezhuth Wasan Awin; K. Kumar; Abhijeet Lale; Samuel Bernard; Ravi Kumar

doi:10.1038/s41598-019-57394-8

Article dans une revue

Design of nanoscaled heterojunctions in precursor-derived t-ZrO2/SiOC(N) nanocomposites: Transgressing the boundaries of catalytic activity from UV to visible light

Shakthipriya Bhaskar ¹ Eranezhuth Wasan Awin ¹ K. Kumar ¹ Abhijeet Lale ² Samuel Bernard ² Ravi Kumar ¹

1 Laboratory for High Performance Ceramics, Department of Metallurgical and Materials Engineering, Indian Institute of Technology-Madras (IIT Madras)

2 IRCER-AXE4 - IRCER - Axe 4 : céramiques sous contraintes environnementales

IRCER - Institut de Recherche sur les CERamiques : AXE4

Abstract : in this work, nanocomposites made of nanosized zirconia crystallized in situ in an amorphous silicon oxycarbo(nitride) (Sioc(n)) matrix have been designed through a precursor route for visible light photocatalytic applications. the relative volume fraction of the starting precursors and the pyrolysis temperatures not only influences the phase fraction of zirconia crystallites but also stabilizes the tetragonal crystal structure of zirconia (t-Zro 2) at room temperature. the presence of carbon in interstitial sites of zirconia and oxygen vacancy defects led to drastic reduction in the band gap (2.2 eV) of the nanocomposite. Apart from being a perfect host avoiding sintering of the active phase and providing mechanical stability, the amorphous matrix also reduces the recombination rate by forming heterojunctions with t-Zro 2. the reduction in band gap as well as the formation of heterojunctions aids in harnessing the visible light for photocatalytic activity.

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Sciences de l'ingénieur [physics] / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-02487218
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Soumis le : vendredi 11 décembre 2020 - 10:00:36
Dernière modification le : lundi 22 novembre 2021 - 11:44:16