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Proceedings Paper

Longitudinal plasma resonance shifts in gold nanoparticle aggregates
Author(s): Thaddeus Jude Norman; Christian Grant; Donny Magana; Roger W. Anderson; Jin Z. Zhang; Daliang Cao; Frank Bridges; Jun Liu; Tony van Buuren
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Paper Abstract

Recent interest in colloidal gold focuses on understanding the tunability of the longitudinal and transverse plasma resonance. It was reported that the reduction of HAuCl4 by Na2S produces gold nanoparticles with an optical absorption in the near infrared. This absorption blue shifts during the course of the reaction. X-ray photoemission spectroscopy (XPS) measurements on this system indicated that there was little sulfur present in the system. A small angle x-ray scattering (SAX) experiment was used to monitor the reaction while simultaneously the UV-VIS spectrum was measured. During the reaction the fractal dimension decreased from 4.154 ± 0.850 to 0.624 ± 0.146. The decrease in fractal dimension coincided with the blue shift in the longitudinal plasma resonance from the near IR to the visible. This suggests a change from reaction limited colloid aggregation (RLCA) to diffusion limited colloid aggregation (DLCA), caused the shift in the plasma resonance.

Paper Details

Date Published: 15 November 2002
PDF: 8 pages
Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); doi: 10.1117/12.451216
Show Author Affiliations
Thaddeus Jude Norman, Univ. of California/Santa Cruz (United States)
Christian Grant, Univ. of California/Santa Cruz (United States)
Donny Magana, Univ. of California/Santa Cruz (United States)
Roger W. Anderson, Univ. of California/Santa Cruz (United States)
Jin Z. Zhang, Univ. of California/Santa Cruz (United States)
Daliang Cao, Univ. of California/Santa Cruz (United States)
Frank Bridges, Univ. of California/Santa Cruz (United States)
Jun Liu, Sandia National Labs. (United States)
Tony van Buuren, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 4807:
Physical Chemistry of Interfaces and Nanomaterials
Jin Z. Zhang; Zhong L. Wang, Editor(s)

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