Porous Silica-Coated Gold Sponges with High Thermal and Catalytic Stability

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A method to fabricate porous silica-coated Au sponges that show high thermal and catalytic stability has been developed for the first time. The method involves dense surface functionalization of Au sponges (made by self-assembly of Au nanoparticles) with thiolated poly(ethylene glycol) (SHPEG), which provides binding and condensation sites for silica precursors. The silica coating thickness can be controlled by using SH-PEG of different molecular weights. The silica-coated Au sponge prepared by using 5 kDa SH-PEG maintains its morphology at temperature as high as 700 degrees C. The calcination removes all organic molecules, resulting in porous silica-coated Au sponges, which contain hierarchically connected micro- and mesopores. The hierarchical pore structures provide an efficient pathway for reactant molecules to access the surface of Au sponges. The porous silica-coated Au sponges show an excellent catalytic recyclability, maintaining the catalytic conversion percentage of 4-nitrophenol by NaBH4 to 4-aminophenol as high as 93% even after 10 catalytic cycles. The method may be applicable for other porous metals, which are of great interests for catalyst, fuel cell, and sensor applications.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

NANOPOROUS-GOLD; 4-NITROPHENOL REDUCTION; CO OXIDATION; NANOPARTICLES; AU; TEMPERATURE; NITROPHENOL; FRAMEWORK

Citation

ACS APPLIED MATERIALS & INTERFACES, v.10, no.26, pp.22562 - 22570

ISSN
1944-8244
DOI
10.1021/acsami.8b04811
URI
http://hdl.handle.net/10203/244865
Appears in Collection
NE-Journal Papers(저널논문)
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