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

  • Mei Chee Tan (a1), Jackie Y. Ying (a2) and Gan Moog Chow (a3)

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.

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a)Address all correspondence to this author. e-mail: msecgm@nus.edu.sg

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Keywords

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

  • Mei Chee Tan (a1), Jackie Y. Ying (a2) and Gan Moog Chow (a3)

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