http://www.cnr.it/ontology/cnr/individuo/prodotto/ID195228

Straightforward Synthesis of Gold Nanoparticles Supported on Commercial Silica-Polyethyleneimine Beads (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Straightforward Synthesis of Gold Nanoparticles Supported on Commercial Silica-Polyethyleneimine Beads (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/jp309518a (literal)

Alternative label

Silvia Fazzini, Daniele Nanni, Barbara Ballarin, Maria Cristina Cassani, Marco Giorgetti, Chiara Maccato, Angela Trapananti, Giuliana Aquilanti, Sameh Ibrahim Ahmed (2012)
Straightforward Synthesis of Gold Nanoparticles Supported on Commercial Silica-Polyethyleneimine Beads
in Journal of physical chemistry. C; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Silvia Fazzini, Daniele Nanni, Barbara Ballarin, Maria Cristina Cassani, Marco Giorgetti, Chiara Maccato, Angela Trapananti, Giuliana Aquilanti, Sameh Ibrahim Ahmed (literal)

Pagina inizio

25434 (literal)

Pagina fine

25443 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

116 (literal)

Rivista

Journal of physical chemistry. C (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

48 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Dipartimento di Chimica Organica \"A.Mangini\", Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy; Dipartimento di Chimica Organica \"A.Mangini\", Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy; Dipartimento di Chimica Fisica e Inorganica, Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy; Dipartimento di Chimica Fisica e Inorganica, Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy; Dipartimento di Chimica Fisica e Inorganica, Alma Mater Studiorum - Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy; Dipartimento di Scienze Chimiche, Università di Padova and INSTM, Via Marzolo 1, I-35131 Padova, Italy; CNR-IOM-OGG c/o ESRF, GILDA CRG, 6, rue Jules Horowitz, B.P 220 F-38043 Grenoble, France; Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, I-34149 Basovizza, Trieste, Italy; Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, I-34149 Basovizza, Trieste, Italy; Physics Department, Faculty of Science, Ain Shams University, 11566 Abbassia (Cairo), Egypt (literal)

Titolo

Straightforward Synthesis of Gold Nanoparticles Supported on Commercial Silica-Polyethyleneimine Beads (literal)

Abstract

Stable silica-supported gold nanoparticles (AuNPs) suitable for catalysis applications were conveniently obtained in a straightforward, one-step synthesis by simply adding an aqueous solution of HAuCl4 to commercial polyethyleneimine-functionalized silica beads (SiO2-PEI) as the only reactant without any external reducing agent and/or conventional stabilizing moieties. Six different types of AuNPs/(SiO2-PEI) beads termed Aux-yh, where x is the initial HAuCl4 concentration (1, 5, or 10 mM) and y is the reaction time (1 or 24 h), were prepared and characterized by UV-vis diffuse reflectance spectroscopy, X-ray fluorescence, FE-SEM microscopy, and X-ray absorption spectroscopy. The SEM micrographs of Aux-yh samples showed that the particle size distribution decreases with the increase of the starting gold concentration, i.e., 70-100 nm for Au1-xh, 40-70 nm for Au5-xh, and Au10-xh, whereas on passing from 1 to 24 h the aggregation phenomena overcome the nucleation ones, promoting the formation of bigger aggregates at the expense of small AuNPs. The XAS analysis as a combination of XANES and EXAFS studies provided detailed structural information regarding the coordination geometry and oxidation state of the gold atoms present on the beads. Moreover, the catalytic activity of the modified silica beads in the reduction of 4-nitrophenol to 4-aminophenol by NaBH4 was investigated and in one case the XAS analysis was repeated after recovery of the catalyst, demonstrating further reduction of the Au site to Au(0). (literal)

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