title: 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.
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 (Rair/Rgas = 17.4 at 5 ppm) with remarkably selective characteristics with a minor response (Rair/Rgas < 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.
authors.affiliation: Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea. idkim@kaist.ac.kr.
authors.forename: Seon-Jin
authors.initials: SJ
authors.lastname: Choi
authors.forename: Minsoo P
authors.initials: MP
authors.lastname: Kim
authors.forename: Seo-Jin
authors.initials: SJ
authors.lastname: Lee
authors.forename: Bumjoon J
authors.initials: BJ
authors.lastname: Kim
authors.forename: Il-Doo
authors.initials: ID
authors.lastname: Kim
mesh_terms: D001944:Breath Tests / Q000379:methods*; D002384:Catalysis; D005740:Gases; D006046:Gold / Q000737:chemistry*; D006209:Halitosis / Q000175:diagnosis*; D006801:Humans; D006862:Hydrogen Sulfide / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D036103:Nanotechnology; D010100:Oxygen / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*
chemical_list: D005740:Gases; D011108:Polymers; D011137:Polystyrenes; D011145:Polyvinyls; D011725:Pyridines; D017971:Tin Compounds; C509607:polystyrene-block-poly(4-vinylpyridine); D006046:Gold; C045358:stannic oxide; D010100:Oxygen; D006862:Hydrogen Sulfide