Surface enhanced Raman activity of star-shaped gold nanoparticles

INOR 502

Emren Nalbant Esenturk, emrenes@nist.gov, Physics Laboratory / Optical Technology Division, National Institude of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899 and Angela R. Hight Walker, angela.hightwalker@nist.gov, Optical Technology Division, Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20889.
Surface Enhanced Raman Spectroscopy (SERS) is an active research area due to its utility as a highly sensitive chemical and bioanalytical sensor. Anisotropic metallic nanoparticles are serious candidates for SERS substrates due to the strong field enhancement at the tips of the sharp features. Star-shaped gold nanoparticles were prepared in aqueous phase by seed-mediated growth method. Characterization of the nanostars was performed via UV-vis spectroscopy and Transmission Electron Microscopy showing unprecedented nanostructures. SERS measurements for 2-mercaptopyridine (2-MPy) adsorbed on aggregated gold nanostars show a larger enhancement than 2-MPy on spherical Au nanoparticles of the similar size. The synthesis, characterization and spectroscopic findings will be presented.
 

Nanoscience - Characterization and Applications
9:00 AM-1:00 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 219, Oral

Division of Inorganic Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008