TY - JOUR
T1 - Selective, conformal deposition of silver on heterojunction under direct sunlight
T2 - Plasmon enhanced photocatalysis
AU - Lopis, Antony Dasint
AU - Choudhari, K. S.
AU - Kanakikodi, Kempanna S.
AU - Maradur, Sanjeev P.
AU - Kulkarni, Suresh D.
N1 - Funding Information:
The authors gratefully acknowledge financial support from (1) SERB, DST, Govt. of India, through the projects SB/S2/CMP-017/2014 and SB/FT/CS-123/2013; (2) Joint Manipal Academy of Higher Education and DST-FIST (Govt. of India) Program via approval letter SR/FST/PSI-174/2012. (3) I-CUP, the Indian Cluster for Ultrafast Photonics, Govt. of India, for funding UV–VIS-NIR spectrophotometer. Antony Dasint Lopis thanks the Karnataka Science and Technology Promotion Society (DST/KSTePS/Ph.D. Fellowship/PHY-05:2019-20) for the award of Research Fellowship and Directorate of Minorities, Govt. of Karnataka (DOM/FELLOWSHIP/CR-58/2017-18) for the award of Research Fellowship. Authors acknowledge the DST PURSE Laboratory, Mangalore University, Mangalagangotri for FESEM imaging.
Funding Information:
The authors gratefully acknowledge financial support from (1) SERB, DST, Govt. of India, through the projects SB/S2/CMP-017/2014 and SB/FT/CS-123/2013; (2) Joint Manipal Academy of Higher Education and DST-FIST (Govt. of India) Program via approval letter SR/FST/PSI-174/2012. (3) I-CUP, the Indian Cluster for Ultrafast Photonics, Govt. of India, for funding UV–VIS-NIR spectrophotometer. Antony Dasint Lopis thanks the Karnataka Science and Technology Promotion Society (DST/KSTePS/Ph.D. Fellowship/PHY-05:2019-20) for the award of Research Fellowship and Directorate of Minorities, Govt. of Karnataka (DOM/FELLOWSHIP/CR-58/2017-18) for the award of Research Fellowship. Authors acknowledge the DST PURSE Laboratory, Mangalore University, Mangalagangotri for FESEM imaging.
Publisher Copyright:
© 2022
PY - 2022/10
Y1 - 2022/10
N2 - 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.
AB - 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.
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U2 - 10.1016/j.materresbull.2022.111929
DO - 10.1016/j.materresbull.2022.111929
M3 - Article
AN - SCOPUS:85132729179
SN - 0025-5408
VL - 154
JO - Materials Research Bulletin
JF - Materials Research Bulletin
M1 - 111929
ER -