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Title: Composition, particle size, and near-infrared irradiation effects on optical properties of Au-Au2S nanoparticles
Authors: Tan, M.C.
Ying, J.Y.
Chow, G.M. 
Issue Date: Jan-2008
Citation: Tan, M.C., Ying, J.Y., Chow, G.M. (2008-01). Composition, particle size, and near-infrared irradiation effects on optical properties of Au-Au2S nanoparticles. Journal of Materials Research 23 (1) : 281-293. ScholarBank@NUS Repository.
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. © 2008 Materials Research Society.
Source Title: Journal of Materials Research
ISSN: 08842914
DOI: 10.1557/jmr.2008.0038
Appears in Collections:Staff Publications

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