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Structure and microstructure of near infrared-absorbing 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, Singapore 117576
Jackie Y. Ying
Affiliation:
Molecular Engineering of Biological and Chemical Systems, Singapore-Massachusetts Institute of Technology Alliance, Singapore 117576; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307; and Institute of Bioengineering and Nanotechnology, The Nanos, Singapore 138669
Gan Moog Chow*
Affiliation:
Molecular Engineering of Biological and Chemical Systems, Singapore-Massachusetts Institute of Technology Alliance, Singapore 117576; and Department of Materials Science and Engineering, National University of Singapore, Singapore 117574
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Near infrared (NIR) absorbing nanoparticles synthesized by the reduction of HAuCl4 with Na2S exhibited absorption bands at ∼530 nm, and in the NIR region of 650–1100 nm. The NIR optical properties were not found to be related to the earlier proposed Au2S–Au core-shell microstructure in previous studies. From a detailed study of the structure and microstructure of as-synthesized particles in this work, S-containing, Au-rich, multiply-twinned nanoparticles were found to exhibit NIR absorption. They consisted of amorphous AuxS (where x = 2), mostly well mixed within crystalline Au, with a small degree of surface segregation of S. Therefore, NIR absorption was likely due to interfacial effects on particle polarization from the introduction of AuxS into Au particles, and not the dielectric confinement of plasmons associated with a core-shell microstructure.

Keywords

CompositeMicrostructureOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2531 - 2538
Copyright
Copyright © Materials Research Society 2007

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