Facile Au catalyst loading on the inner shell of hollow SnO2 spheres using Au-decorated block copolymer sphere templates and their selective H2S sensing characteristics
- Authors
- Choi, Seon Jin; Kim, Minsoo P.; Lee, Seo-Jin; Kim, Bumjoon J.; Kim, Il-Doo
- Issue Date
- Oct-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.6, no.20, pp.11898 - 11903
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 6
- Number
- 20
- Start Page
- 11898
- End Page
- 11903
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158893
- DOI
- 10.1039/c4nr03706e
- ISSN
- 2040-3364
- Abstract
- Hollow SnO2 spheres functionalized by Au catalysts were synthesized via the use of Au-decorated block copolymer (Au-BCP) sphere templates. Uniformly distributed Au nanoparticles on BCP spheres were prepared by the infiltration of Au precursors into polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) spheres. A thin SnO2 layer was coated on the Au-BCP spheres using RF sputtering at room temperature without morphological deformation of the spheres. The Au nanoparticles were uniformly transferred from the Au-BCP spheres to the inner shells of the hollow SnO2 spheres followed by decomposition of BCP spheres. The Au-loaded hollow SnO2 spheres exhibited a superior H2S sensitivity (R-air/R-gas = 17.4 at 5 ppm) with remarkably selective characteristics with a minor response (R-air/R-gas ˂ 2.5 at 5 ppm) toward other interfering gases. Our results pave the way for a new catalyst loading method using Au-BCP spheres for the uniformly distributed Au NPs on the SnO2 layers.
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