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Au, Ag and Au:Ag colloidal nanoparticles synthesized by pulsed laser ablation as SERS substrates

Progress in Natural Science:Materials International 2014年第6期24卷 569-578页

作者： M.Vinod k.g.gopchandran Department of Optoelectronics University of Kerala

Chemically pure colloidal suspensions of gold and silver nanoparticles were synthesized using pulsed laser *** dependence of laser fl uence on the surface plasmon characteristics of the nanoparticles was ***:Ag colloidal suspensions were prepared by mixing highly monodisperse Au and Ag *** plasmon band of these mixtures was found to be highly sensitive to Au:Ag concentration ratio and wavelength of the laser beam used in the ablation *** Au:Ag mixture consists of almost spherical shaped nanostructures with a tendency to join with adjacent *** surface enhanced Raman scattering activity of the Au,Ag and Au:Ag colloidal suspensions was tested using crystal violet as probe *** in Raman signal obtained with Au:Ag substrates was found to be promising and strongly depends on its plasmon characteristics.

关键词： Laser ablation Au and Ag nanoparticles Nanocolloids Plasmon SERS Crystal violet

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Size-dependent optical properties of Au nanorods

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Progress in Natural Science:Materials International 2013年第1期23卷 36-43页

作者： S.L.Smitha k.g.gopchandran N.Smijesh Reji Philip Department of Optoelectronics University of KeralaThiruvananthapuram-695 581India St.Joseph's College for Women Alappuzha-688 001India Raman Research Institute C.V.Raman AvenueSadashivanagarBangalore 560080India

In the fast evolving field of nanoscience and nanotechnology,where size and shape are crucial in deciding the optoelectronic properties of nanomaterials,the understanding of size and shape dependent behavior is of direct relevance to device *** study reports the synthesis of Au nanorods with well controlled aspect ratios,and the influence of the aspect ratio on the surface enhanced Raman scattering(SERS) activity using crystal violet(CV) as the probe *** influence of pH and the concentrations of reducing agent and Ag ions in controlling the aspect ratio of gold nanorods are also *** structural and optical properties of the synthesized samples have been characterized by transmission electron microscopy(TEM) and UV-visible absorption *** nonlinear optical(NLO) transmission of the Au nanorods investigated using the open aperture Z-scan technique revealed the absorption saturation followed by an optical limiting behavior,which may find potential applications in optoelectronic nanodevices.

关键词： Au nanorods SERS Crystal violet Z-scan Nonlinear absorption Optical limiting

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