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Synthesis of gold nanocrystals in concurrently polymerizing organic–inorganic hybrid films

Published online by Cambridge University Press:  03 March 2011

Mauro Epifani ,
Elvio Carlino ,
Davide Furlanetto ,
Cinzia Giannini  and
Patrizia Imperatori
Mauro Epifani*
Affiliation:
Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica ed i Microsistemi, CNR-IMM, sezione di Lecce, 73100 Lecce, Italy
Elvio Carlino
Affiliation:
Centro di Microscopia Elettronica - Laboratorio Nazionale INFM-TASC Area Scienze Park, 34012 Trieste, Italy
Davide Furlanetto
Affiliation:
Centro di Microscopia Elettronica - Laboratorio Nazionale INFM-TASC Area Scienze Park, 34012 Trieste, Italy
Cinzia Giannini
Affiliation:
Consiglio Nazionale delle Ricerche, Istituto di Cristallografia, CNR-IC, sezione di Bari,70125 Bari, Italy
Patrizia Imperatori
Affiliation:
Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, CNR-ISM,sezione di Montelibretti, 00016 Monterotondo (Roma), Italy
*
a)Address all correspondence to this author.e-mail: mauro.epifani@imm.cnr.it
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Abstract

Gold nanocrystals were formed and grown in simultaneously polymerizing hybrid organic–inorganic films. For the preparation of Au containing films, tetraethyl orthosilicate and methacryloxypropyltrimethoxysilane were separately hydrolyzed and the resulting sols were mixed, followed by the addition of a photoinitiator and a NaAuCl4 solution in methanol. The resulting solutions were spin-coated onto glass-substrates, and the so-formed films were irradiated with a solar simulator at powers ranging from 200 to 800 W. The irradiation resulted in simultaneous polymerization of the films and formation of gold nanoparticles. The irradiated films were characterized by x-ray diffraction measurements, ultraviolet–visible optical absorption spectroscopy and transmission electron microscopy studies. After irradiation at 800 W, the transmission electron microscopy experiments showed the presence of homogeneously distributed Au nanoparticles with a size distribution ranging from 2 to 12 nm. The interpretation of the results indicates that the Au particle growth depends on the matrix polymerization rate; enhancing the rate by increasing the irradiation power or the photoinitiator concentration results in smaller particle domains. This result is explained referring to influence of the polymerization rate on the diffusion of gold species through the host.

Keywords

NanoparticleNucleation & growthSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 5 , May 2005 , pp. 1287 - 1294
Copyright
Copyright © Materials Research Society 2005

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