Femtosecond laser induced synthesis of Au nanoparticles mediated by chitosan
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
10/10/2013
10/10/2013
2012
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| Resumo |
This paper reports the synthesis of Au nanoparticles by 30-fs pulses irradiation of a sample containing HAuCl4 and chitosan, a biopolymer used as reducing agent and stabilizer. We observed that it is a multi-photon induced process, with a threshold irradiance of 3.8 x 10(11) W/cm(2) at 790 nm. By transmission electron microscopy we observed nanoparticles from 8 to 50 nm with distinct shapes. Infrared spectroscopy indicated that the reduction of gold and consequent production of nanoparticles is related to the fs-pulse induced oxidation of hydroxyl to carbonyl groups in chitosan. (C) 2011 Optical Society of America Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) |
| Identificador |
OPTICS EXPRESS, WASHINGTON, v. 20, n. 1, pp. 518-523, 37257, 2012 1094-4087 http://www.producao.usp.br/handle/BDPI/34082 10.1364/OE.20.000518 |
| Idioma(s) |
eng |
| Publicador |
OPTICAL SOC AMER WASHINGTON |
| Relação |
OPTICS EXPRESS |
| Direitos |
closedAccess Copyright OPTICAL SOC AMER |
| Palavras-Chave | #GOLD NANOPARTICLES #METAL NANOPARTICLES #WATER #BREAKDOWN #SURFACES #FILMS #SIZE #OPTICS |
| Tipo |
article original article publishedVersion |
