Small-angle X-ray scattering study of the aggregation of gold nanoparticles during formation at the toluene-water interface

Bera, M. K. ; Sanyal, M. K. ; Yang, L. ; Biswas, K. ; Gibaud, A. ; Rao, C. N. R. (2010) Small-angle X-ray scattering study of the aggregation of gold nanoparticles during formation at the toluene-water interface Physical Review B: Condensed Matter and Materials Physics, 81 (11). 115415_1-115415_7. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v81/i11/e115415

Related URL: http://dx.doi.org/10.1103/PhysRevB.81.115415

Abstract

We report the results of an in situ small-angle X-ray scattering (SAXS) study of the aggregation of gold nanoparticles formed by an interfacial reaction at the toluene-water interface. The SAXS data provide a direct evidence for aggregate formation of nanoparticles having 1.3 nm gold core and an organic shell that gives a core-core separation of about 2.5 nm. Furthermore, the nanoparticles do not occupy all the cites of 13-member cluster. This occupancy decreases with reaction time and indicate reorganization of the clusters that generates planner disklike structures. A gradual increase in fractal dimension from 1.82 to 2.05 also indicate compactification of cluster aggregation with reaction time, the final exponent being close to 2 expected for disklike aggregates.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:39919
Deposited On:20 May 2011 06:57
Last Modified:11 Jul 2012 10:11

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