Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 42, Pages 24538-24547Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp507637m
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Funding
- University of Bologna
- MIUR [PRIN 2010-2011-010PFLRJR]
- Center for Industrial Research - Advanced Applications in Mechanical Engineering and Materials Technology (CIRI-MAM)
- Fonds Europeen de Developpement Regional (FEDER)
- CNRS
- Region Nord Pas-de-Calais
- Ministere de l'Education Nationale de l'Enseignement Superieur et de la Recherche
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A novel, convenient method for the preparation of gold nanoparticles supported on alkyne-functionalized nanosilica is presented. Silica nanoparticles functionalized with alkynyl carbamate moieties (SiO2@Yne) were synthesized by co-condensation of the difunctional organosilane [3-(2-propynylcarbamate)propyl]triethoxysilane (PPTEOS) with tetraethoxysilane (TEOS) in an alkaline medium. The alkynyl-carbamate functionalities present on silica are able to capture the gold precursor HAuCl4, spontaneously reduce it, and stabilize the resulting supported AuNPs, having an average size of ca. 11 nm. The prepared Au-SiO2@Yne was thoroughly analyzed by X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), FT-IR, and UVvis spectroscopy. The catalytic activity of Au-SiO2@Yne was investigated for the reduction of 4-nitrophenol to 4-aminophenol by NaBH4, and kinetic constants k in the order of magnitude of about 10(2) s(1) were found.
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