Selective, conformal deposition of silver on heterojunction under direct sunlight: Plasmon enhanced photocatalysis

被引：3

作者：

Lopis, Antony Dasint ^{[1
]}

Choudhari, K. S. ^{[1
]}

Kanakikodi, Kempanna S. ^{[2
]}

Maradur, Sanjeev P. ^{[2
]}

Kulkarni, Suresh D. ^{[1
]}

机构：

[1] Manipal Acad Higher Educ, Dept Atom & Mol Phys, Manipal 576104, Karnataka, India

[2] Poornaprajna Inst Sci Res PPISR, Mat Sci & Catalysis Div, Bengaluru 562164, Karnataka, India

来源：

MATERIALS RESEARCH BULLETIN | 2022年 / 154卷

关键词：

Semiconductors; Optical materials; Metals; Composites; Catalytic properties; SHELL ZNFE2O4-AT-ZNO NANOPARTICLES; FACILE SYNTHESIS; TIO2; SOLAR; ZNO; PHOTODEGRADATION; NANOSTRUCTURES; DEGRADATION; PERFORMANCE; PHASE;

D O I：

10.1016/j.materresbull.2022.111929

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using freely available sunlight, Silver was selectively reduced onto solar-photocatalyst nanospheres(Fe2+-doped zinc-ferrite with ZnO-shell) for the first time without using holescavenger. Ag-coating was conformal as observed by SEM-images and also similar surface properties before and after Ag-coating. Deposition of Ag takes place only on the ZnO-shell where photogenerated electrons are available. Owing to Ag-induced localized-surface-plasmon-resonance(LSPR) the absorption was red-shifted upto 730 nm. Ag-coated photocatalyst was used for the direct-sunlight assisted photo-degradation of Rhodamine-B. Various loadings of Ag-coating and ZnO were used to understand the optimum photocatalyst. The degradation was 4.3-times faster over that without Ag-coating and 13.5-times for one with annealed-core. Both hydroxyl and superoxide-radicals were found participating as the reactive-oxygen-species. The Ag-coated catalyst showed reproducible activity upto 5-reuse cycles with no significant changes in the activity. This work demonstrates potential green-synthesis method for selective conformal Ag-coating. Our composite with conducive band-alignment is promising for the direct sunlight assisted photodegradation applications.

引用

页数：12

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