https://doi.org/10.1140/epjd/e2005-00152-3
Mesoscopic linear alignment and thermal-relaxation dynamics of aggregated gold nanorods
School of Chemistry, Seoul National University, NS60, Seoul 151-742, Korea
Corresponding author: a djjang@plaza.snu.ac.kr
Received:
6
September
2004
Published online:
13
July
2005
Aqueous gold nanorod colloids aggregated by Cl- are further assembled into linearly aligned structures of linear bundles during evaporation on TEM grids. Gold nanorods in bundles are also oriented in nearly head-to-tail shapes in the microscopic scale. Induced dipolar long-range interactions in the mesoscopic scale are suggested to drive gold nanorods to aggregate. Although surface-plasmon absorption at transverse resonances decreases, that at longitudinal resonances increases with aggregation. The photon-thermalized heat of the dispersed and the aggregated gold nanorods dissipates to immediately surrounding media on the time scales of 100 and 800 ps, respectively.
PACS: 81.16.-c – Methods of nanofabrication and processing / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 81.07.-b – Nanoscale materials and structures: fabrication and characterization
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
