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Composition, particle size, and near-infrared irradiation effects on optical properties of Au–Au2S nanoparticles

Published online by Cambridge University Press:  31 January 2011

Mei Chee Tan ,
Jackie Y. Ying  and
Gan Moog Chow
Mei Chee Tan
Affiliation:
Molecular Engineering of Biological and Chemical Systems, Singapore–Massachusetts Institute of Technology Alliance, 117574 Singapore
Jackie Y. Ying
Affiliation:
Molecular Engineering of Biological and Chemical Systems, Singapore–Massachusetts Institute of Technology Alliance, 117574 Singapore; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute of Bioengineering and Nanotechnology, 138669 Singapore
Gan Moog Chow*
Affiliation:
Molecular Engineering of Biological and Chemical Systems, Singapore–Massachusetts Institute of Technology Alliance, 117574 Singapore; and Department of Materials Science and Engineering, National University of Singapore, 119260 Singapore
*
a)Address all correspondence to this author. e-mail: msecgm@nus.edu.sg
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Abstract

Near-infrared (NIR)-absorbing nanoparticles synthesized by the reduction of tetrachloroauric acid (HAuCl4) using sodium sulfide (Na2S) exhibited absorption bands at ∼530 nm and at the NIR region of 650−1100 nm. A detailed study on the structure and microstructure of as-synthesized nanoparticles was reported previously. The as-synthesized nanoparticles were found to consist of amorphous AuxS (x = ∼2), mostly well mixed within crystalline Au. In this work, the optical properties were tailored by varying the precursor molar ratios of HAuCl4 and Na2S. In addition, a detailed study of composition and particle-size effects on the optical properties was discussed. The change of polarizability by the introduction of S in the form of AuxS (x = ∼2) had a significant effect on NIR absorption. Also, it was found in this work that exposure of these particles to NIR irradiation using a Nd:YAG laser resulted in loss of the NIR absorption band. Thermal effects generated during NIR irradiation had led to microstructural changes that modified the optical properties of particles.

Keywords

AuCompositeOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 281 - 293
Copyright
Copyright © Materials Research Society 2008

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