Longitudinal plasma resonance shifts in gold nanoparticle aggregates

Thaddeus Jude Norman Jr.; Christian Grant; Donny Magana; Roger W. Anderson; Jin Z. Zhang; Daliang Cao; Frank Bridges; Jun Liu; Tony van Buuren

doi:10.1117/12.451216

15 November 2002 Longitudinal Plasma Resonance Shifts in Gold Nanoparticle Aggregates

Thaddeus Jude Norman Jr., Christian Grant, Donny Magana, Roger W. Anderson, Jin Z. Zhang, Daliang Cao, Frank Bridges, Jun Liu, Tony van Buuren

Author Affiliations +

Proceedings Volume 4807, Physical Chemistry of Interfaces and Nanomaterials; (2002) https://doi.org/10.1117/12.451216
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Thaddeus Jude Norman Jr., Christian Grant, Donny Magana, Roger W. Anderson, Jin Z. Zhang, Daliang Cao, Frank Bridges, Jun Liu, and Tony van Buuren "Longitudinal Plasma Resonance Shifts in Gold Nanoparticle Aggregates", Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); https://doi.org/10.1117/12.451216

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