Using femtosecond lasers to modify sizes of gold nanoparticles

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dc.contributor.authorCordeiro, Thiago da Silva
dc.contributor.authorde Matos, Ricardo Almeida [UNIFESP]
dc.contributor.authorde Oliveira Silva, Flavia Rodrigues
dc.contributor.authorVieira, Nilson Dias, Jr.
dc.contributor.authorCourrol, Lilia Coronato [UNIFESP]
dc.contributor.authorSamad, Ricardo Elgul
dc.date.accessioned2019-01-21T10:29:56Z
dc.date.available2019-01-21T10:29:56Z
dc.date.issued2016
dc.description.abstractMetallic nanoparticles are important on several scientific, medical and industrial areas. The control of nanoparticles characteristics has fundamental importance to increase the efficiency on the processes and applications in which they are employed. The metallic nanoparticles present specific surface plasmon resonances (SPR). These resonances are related with the collective oscillations of the electrons presents on the metallic nanoparticle. The SPR is determined by the potential defined by the nanoparticle size and geometry. There are several methods of producing gold nanoparticles, including the use of toxic chemical polymers. We already reported the use of natural polymers, as for example, the agar-agar, to produce metallic nanoparticles under xenon lamp irradiation. This technique is characterized as a "green" synthesis because the natural polymers are inoffensive to the environment. We report a technique to produce metallic nanoparticles and change its geometrical and dimensional characteristics using a femtosecond laser. The 1 ml initial solution was irradiate using a laser beam with 380 mW, 1 kHz and 40 nm of bandwidth centered at 800 nm. The setup uses an Acousto-optic modulator, Dazzler, to change the pulses spectral profiles by introduction of several orders of phase, resulting in different temporal energy distributions. The use of Dazzler has the objective of change the gold nanoparticles average size by the changing of temporal energy distributions of the laser pulses incident in the sample. After the laser irradiation, the gold nanoparticles average diameter were less than 15 nm.en
dc.description.affiliationUniversidade Federal de São Paulo, UNIFESP, São Paulo, Brazil
dc.description.affiliationInstituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, UNIFESP, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.identifierhttp://dx.doi.org/10.1117/12.2227759
dc.identifier.citationNanophotonics Vi. Bellingham, v. 9884, 2016.
dc.identifier.doi10.1117/12.2227759
dc.identifier.issn0277-786X
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/49487
dc.identifier.wosWOS:000378220200050
dc.language.isoeng
dc.publisherSpie-int soc optical engineering
dc.relation.ispartofNanophotonics Vi
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectMetallic Nanoparticlesen
dc.subjectGold Nanoparticlesen
dc.subjectFemtosecond Lasersen
dc.subjectPlasmon Resonancesen
dc.subjectDispersive Filteren
dc.subjectNanoparticles Productionen
dc.subjectNanoparticles Irradiationen
dc.subjectNanoparticles FragmantationSurface-Plasmon Resonanceen
dc.subjectSilver Nanoparticlesen
dc.subjectMetal Nanoparticlesen
dc.subjectOptical-Propertiesen
dc.subjectAbsorptionen
dc.subjectAblationen
dc.subjectModelen
dc.titleUsing femtosecond lasers to modify sizes of gold nanoparticlesen
dc.typeinfo:eu-repo/semantics/conferenceObject
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