Femtosecond laser induced synthesis of Au nanoparticles mediated by chitosan

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 × 10(11) W/cm2 at 790 nm. By tran...

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Published inOptics express Vol. 20; no. 1; pp. 518 - 523
Main Authors Ferreira, P H D, Vivas, M G, De Boni, L, dos Santos, Jr, D S, Balogh, D T, Misoguti, L, Mendonca, C R
Format Journal Article
LanguageEnglish
Published United States 02.01.2012
Subjects
Chitosan - chemistry
Chitosan - radiation effects
Gold - chemistry
Gold - radiation effects
Lasers
Materials Testing
Nanoparticles - chemistry
Nanoparticles - radiation effects
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Summary: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 × 10(11) W/cm2 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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.20.000518