Sol-Gel Processing of Au Nanoparticles in Bulk 10%B2O3-90%SiO2 Glass (Articolo in rivista)

Type
Label
  • Sol-Gel Processing of Au Nanoparticles in Bulk 10%B2O3-90%SiO2 Glass (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • Epifani M, Carlino E, Blasi C, Giannini C, Tapfer L, Vasanelli L (2001)
    Sol-Gel Processing of Au Nanoparticles in Bulk 10%B2O3-90%SiO2 Glass
    in Chemistry of materials
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Epifani M, Carlino E, Blasi C, Giannini C, Tapfer L, Vasanelli L (literal)
Pagina inizio
  • 1533 (literal)
Pagina fine
  • 1539 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 13 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Il lavoro descrive una tecnica innovativa per la sintesi a basse temperature di vetri modificati con nanoparticelle di oro. Il problema della riduzione rapida del precursore dell'oro e della conseguente opacizzazione della matrice vienre risolto in modo completo tramite una modifica chimica del precursore dell'oro, permettendone una distribuzione uniforme all'interno della matrice anche in seguito ai trattamenti termici. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) CNR-IMM Sezione di Lecce 2) Parco Scientifico e Tecnologico Area Ionico-Salentina-Centro Nazionale per la Ricerca e lo Sviluppo dei Materiali (PA.S.T.I.S.-C.N.R.S.M), 72100 Brindisi, Italy 3) Consiglio Nazionale delle Ricerche – Istituto per lo Studio di Nuovi Materiali per l’Elettronica and Dipartimento Ingegneria dell’Innovazione, Università di Lecce, 73100 Lecce, Italy (literal)
Titolo
  • Sol-Gel Processing of Au Nanoparticles in Bulk 10%B2O3-90%SiO2 Glass (literal)
Abstract
  • Bulk borosilicate glasses were prepared by the sol-gel process and doped with gold nanoparticles. First, a sol of the host glass (with nominal molar composition of 10% B2O3-90% SiO2) was prepared, and then gold was introduced into the sol by means of a solution of a Au3+ complex. The resulting gels were dried at 60 °C and then heated in air at various temperatures up to 600 °C to nucleate the gold particles and sinter the glass matrix. Various gold ligands were tested, and thiourea was found to be the most effective ligand in preventing fast gold reduction and precipitation to the gel surface during drying. A model based on the formation of insoluble gold species during drying of the gel is discussed to explain the phenomenon of gold precipitation to the sample surface. The heated gels were studied by measurements of the BET specific surface area and of the apparent density, showing the densification of the matrix during the heat treatments. UV-vis optical absorption spectroscopy was used to monitor the formation of Au nanoparticles that was effective after heating the gel at 300 °C in air. TEM studies revealed that two kinds of Au particles were present, with mean sizes of 10 and 30 nm. The smaller particles have a lattice spacing corresponding to face-centered cubic Au, whereas electron nanodiffraction patterns of the larger particles exhibit features of orthorhombic Au3Si. (literal)
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