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Synthesis Of Metal Nanoparticle And Investigate The Spectroscopic Character Of Their Ordered Assembly Structure

Posted on:2006-04-24Degree:MasterType:Thesis
Country:ChinaCandidate:X X ZhangFull Text:PDF
GTID:2121360155467596Subject:Inorganic Chemistry
Abstract/Summary:PDF Full Text Request
Nano-sized gold spheres and rods were prepared by citrate reduction and seed-induced growth methods, respectively. Absorption spectra of the gold particles and rods indicated that the surface plasmon resonance of gold nanoparticles was associated with the shape of the particles. Gold spheres exhibited single SPR band, while gold rods possessed two SPR bands: transversal and longitudinal resonance. The position and intensity of the longitudinal resonance relied on the aspect ratio of the rods. Relative to the gold spheres, the rods showed greater enhancement for the Raman scattering of the adsorbed p-mercaptobenzoic acid. This is ascribed to the adsorption of p-mercaptobenzoic acid on the high energy crystal face, which may result in greater chemical enhancement.Two-dimensional submonolayer of gold and silver nanoparticles were prepared on glass surface by self-assembly method.Double assembly structure of silver nanoparticles was also constructed with 4-aminothiophenol as the linker,forming particle cluster with molecular gap between the particles.Surface plasmon resonance (SPR) of the assembled silver nanoparticles depended on the distance between the particles,the adsorption of molecules,and the assembled structure.The electromagnetic coupling among the particles in the particle monolayer resulted in a blue shift of the SPR band.Surface-enhanced Raman spectroscopic results demonstrated that the nanoparticle cluster with molecular gap between the particles led to a great enhancement of the Raman scattering of the linked molecules and nanoparticles. Then,the corporate influence of different linked molecules to Surface-enhenced Raman scattering.
Keywords/Search Tags:Gold particle, Ag particle, Surface- enhanced Raman spectroscopy, Self-assemble
PDF Full Text Request
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