Nano Archive

One-dimensional self-assembly of gold nanoparticles for tunable surface plasmon resonance properties

Yang, Y and Matsubara, S and Nogami, M and Shi, JL and Huang, WM (2006) One-dimensional self-assembly of gold nanoparticles for tunable surface plasmon resonance properties. NANOTECHNOLOGY, 17 (11). pp. 2821-2827.

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Official URL: http://dx.doi.org/10.1088/0957-4484/17/11/015

Abstract

The localized surface plasmon resonance (LSPR) is a collective oscillation of the nanoparticle conduction electrons. LSPR excitation in silver and gold nanoparticles produces strong extinction and scattering spectra that in recent years have been used for important sensing and spectroscopy applications. Tuning the optoelectronic properties by controlling coupled SP modes in metals is one of the major challenges in the area of metal nanomaterials. Here we develop a simple method to fabricate linear-chainlike aggregates of gold nanoparticles (so-called nanochains), tuning the linear optical properties in a wide wavelength range from visible to the near infrared. The aggregation behaviour and linear self-assembly mechanism of citrate-stabilized gold colloids as provoked by the addition of cetyltrimethylammonium bromide ( CTAB) are also analysed. The CTAB with appropriate concentration serves as the `glue' that can link the {100} facets of two neighbour Au NPs, which leads to an anisotropic distribution of the residual surface charge, and this extrinsic electric dipole formation is responsible for the linear organization of the gold NPs into short chains.

Item Type:Article
Subjects:Material Science > Nanostructured materials
Physical Science > Photonics
ID Code:3722
Deposited By:Farnush Anwar
Deposited On:22 Jan 2009 14:11
Last Modified:22 Jan 2009 14:11

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