Graphene as a thin-film catalyst booster: graphene-catalyst interface plays a critical role
- Authors
- Chae, Sieun; Choi, Won Jin; Chae, Soo Sang; Jang, Seunghun; Chang, Hyunju; Lee, Tae Il; Kim, Youn Sang; Lee, Jeong-O
- Issue Date
- 8-Dec-2017
- Publisher
- IOP PUBLISHING LTD
- Keywords
- graphene; transparency; morphology; surface energy; hydrothermal growth
- Citation
- NANOTECHNOLOGY, v.28, no.49
- Journal Title
- NANOTECHNOLOGY
- Volume
- 28
- Number
- 49
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/5355
- DOI
- 10.1088/1361-6528/aa94b0
- ISSN
- 0957-4484
- Abstract
- Due to its extreme thinness, graphene can transmit some surface properties of its underlying substrate, a phenomenon referred to as graphene transparency. Here we demonstrate the application of the transparency of graphene as a protector of thin-film catalysts and a booster of their catalytic efficiency. The photocatalytic degradation of dye molecules by ZnO thin films was chosen as a model system. A ZnO thin film coated with monolayer graphene showed greater catalytic efficiency and long-term stability than did bare ZnO. Interestingly, we found the catalytic efficiency of the graphene-coated ZnO thin film to depend critically on the nature of the bottom ZnO layer; graphene transferred to a relatively rough, sputter-coated ZnO thin film showed rather poor catalytic degradation of the dye molecules while a smooth sol-gelsynthesized ZnO covered with monolayer graphene showed enhanced catalytic degradation. Based on a systematic investigation of the interface between graphene and ZnO thin films, we concluded the transparency of graphene to be critically dependent on its interface with a supporting substrate. Graphene supported on an atomically flat substrate was found to efficiently transmit the properties of the substrate, but graphene suspended on a substrate with a rough nanoscale topography was completely opaque to the substrate properties. Our experimental observations revealed the morphology of the substrate to be a key factor affecting the transparency of graphene, and should be taken into account in order to optimally apply graphene as a protector of catalytic thin films and a booster of their catalysis.
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