Synthesis of Ag-ZnO core-shell nanoparticles with enhanced photocatalytic activity through atomic layer depositionopen access
- Authors
- Seong, Sejong; Park, In-Sung; Jung, Yong Chan; Lee, Taehoon; Kim, Seon Yong; Park, Ji Soo; Ko, Jae-Hyeon; Ahn, Jinho
- Issue Date
- Sep-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Photocatalyst; Core-shell; Surface plasmon resonance; Silver; Zinc oxide; Atomic layer deposition
- Citation
- MATERIALS & DESIGN, v.177, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS & DESIGN
- Volume
- 177
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12588
- DOI
- 10.1016/j.matdes.2019.107831
- ISSN
- 0264-1275
- Abstract
- Herein, Ag-ZnO core-shell nanoparticles (NPs) with enhanced photocatalytic activity were prepared by coating Ag metal cores with ZnO semiconductor shells through atomic layer deposition (ALD). Instrumental analysis revealed that the ultra-thin and conformal nature of the shell allowed the core-shell NPs to simultaneously exploit the photocatalytic properties of ZnO and the plasmonic properties of Ag. In a rhodamine B photodegradation test performed under artificial sunlight. Ag-ZnO core-shell NPs exhibited better photocatalytic performance than other prepared photocatalysts, namely ZnO NPs and ALD-ZnO coated ZnO NPs. The performance enhancement was ascribed to the effect of noble metal-semiconductor heterojunctions, which increased the efficiency of electron-hole separation. i.e., the Ag core effectively captured excited electrons at the ZnO surface, which resulted in the elevated production of hydroxyl radicals from holes remaining at ZnO. A three-dimensional finite-difference time-domain simulation of the Ag-ZnO NPs with variable shell thickness showed that ZnO shells on Ag metal cores increase the intensity of light around NPs, allowing the plasmonic cores to fully utilize incident light.
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