AVS 51st International Symposium
    Nanometer-scale Science and Technology Friday Sessions
       Session NS-FrM

Paper NS-FrM8
Synthesis and Optical Characterization of Gold Nanoplates

Friday, November 19, 2004, 10:40 am, Room 213D

Session: Nanometer-scale Structures
Presenter: W.S. Yun, Korea Research Institute of Standards and Science, Korea
Authors: C.S. Ah, Korea Research Institute of Standards and Science, Korea
W.S. Yun, Korea Research Institute of Standards and Science, Korea
D.H. Ha, Korea Research Institute of Standards and Science, Korea
K.J. Kim, Korea Research Institute of Standards and Science, Korea
Correspondent: Click to Email
We report on a high-yield synthesis and optical characterization of gold nanoplates. The nanoplates were prepared by controlled reduction of hydrogen tetrachloroaurate with reduced amount of sodium citrate in the presence of poly(vinyl pyrrolidone). The plates have a shape of either triangle or truncated-triangle of around 10@super 4@ - 10@super 5@ nm@super 2@ in area with a thickness of about 20 - 30 nm. High-resolution TEM analysis reveals that the individual plate is a single crystal with well-developed flat {111} facets. Optical spectra of the nanoplates show distinctive plasmon absorption bands which can be attributed to their highly-anisotropic shape. The optical characteristics are strongly dependent upon the size of the gold nanoplates. In particular, the absorption band in NIR region, which is believed to originate from the longitudinal dipole plasmon resonance, dramatically shifts to red when the planar size of the plate increases. We hope that this gold nanoplate should serve as an excellent platform for molecular self-assembly and as a useful building-block in developing new-materials and devices.