Authors Shaj Kumar, A. ; Nandan, B. ; Sanwaria, S. ; Albrecht, V. ; Libera, M. ; Lee, M.-H. ; Auffermann, G. ; Stamm, M. ; Horechyy, A.
Title Silica-supported Au@hollow-SiO2 particles with outstanding catalytic activity prepared via block copolymer template approach
Date 01.04.2017
Number 52528
Abstract Catalytically active Au@hollow-SiO2 particles embedded in porous silica support (Au@hollow-SiO2@PSS) were prepared by using spherical micelles from poly(styrene)-block-poly(4-vinyl pyridine) block copolymer as a sacrificial template. Drastic increase of the shell porosity was observed after pyrolytic removal of polymeric template because the stretched poly(4-vinyl pyridine) chains interpenetrating with silica shell acted as an effective porogen. The embedding of Au@hollow-SiO2 particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO2@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo red azo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO2@PSS catalyst shows the highest activity among analogous systems reported till now in literature. Such high activity was attributed to the presence of multiple pores within silica shell of Au@hollow-SiO2 particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support.
Publisher Journal of Colloid and Interface Science
Citation Journal of Colloid and Interface Science 491 (2017) 246-254

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