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Photoinduced formation of colloidal Au by a near-infrared femtosecond laser

Published online by Cambridge University Press:  31 January 2011

Chongjun Zhao ,
Shiliang Qu ,
Jianrong Qiu  and
Congshan Zhu
Chongjun Zhao*
Affiliation:
Photon Craft Project, Shanghai Institute of Optics & Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology, Shanghai, 201800, People's Republic of China
Shiliang Qu
Affiliation:
Photon Craft Project, Shanghai Institute of Optics & Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology, Shanghai, 201800, People's Republic of China
Jianrong Qiu
Affiliation:
Photon Craft Project, Shanghai Institute of Optics & Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology, Shanghai, 201800, People's Republic of China
Congshan Zhu
Affiliation:
Photon Craft Project, Shanghai Institute of Optics & Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology, Shanghai, 201800, People's Republic of China
*
a)Address all correspondence to this author. e-mail: chongjunzhao@mail.siom.ac.cn
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Abstract

A Au colloid was prepared in a 5 mM HAuCl4 solution through irradiation with a focused infrared femtosecond laser at 800 nm. The Au colloid was characterized by absorption spectra, transmission electron microscopy, and x-ray diffraction analysis. The appearance of absorption peak around 526 nm in the absorption spectra and the wine-red color of sample solution HAuCl4 under focused laser irradiation verified the formation of Au colloid. The solution color changed in the order of yellow → orange → wine-red due to the local formation of Au nanoparticles near the focus. The pulse energy, focus position of laser beam, and solvent composite play important roles in formation, grain size, and stability of the Au colloid. A mechanism for the precipitate of Au nanoparticles was proposed, and a multiphoton process of femtosecond laser was involved.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1710 - 1714
Copyright
Copyright © Materials Research Society 2003

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