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光诱导法制备银纳米棱镜的重大发现

[size=6]Photoinduced Conversion of Silver Nanospheres to Nanoprisms[/size]

Rongchao Jin,1 YunWei Cao,1 Chad A. Mirkin,1* K. L. Kelly,1
George C. Schatz,1* J. G. Zheng2

[b][i]Science[/i][/b] (30 November 2001:) (2001)[b] 294[/b]: 1901-3;  DOI: 10.1126/science.1066541

A photoinduced method for converting large quantities of silver nanospheres into triangular nanoprisms is reported. The photo-process has been characterized by time-dependent ultraviolet-visible spectroscopy and transmission electron microscopy, allowing for the observation of several key intermediates in and characteristics of the conversion process. This light-driven process results in a colloid with distinctive optical properties that directly relate to the nanoprism shape of the particles. Theoretical calculations coupled with experimental observations allow for the assignment of the nanoprism plasmon bands and for the Þrst identiÞcation of two distinct quadrupole plasmon resonances for a nanoparticle. Unlike the spherical particles they are derived from that Rayleigh light-scatter in the blue, these nanoprisms exhibit scattering in the red, which could be useful in developing multicolor diagnostic labels on the basis not only of nanoparticle composition and size but also of shape.

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:) interesting work

I'd like to see it. Thanks.

好消息，谢谢提供！:time: :lol

good!

题目不错，值得看看！

好东西，多谢分享！！！

thank
:) :)

[size=6]Controlling anisotropic nanoparticle growth through plasmon excitation[/size]
Rongchao Jin, Y. Charles Cao, Encai Hao, Gabriella S. Me´ traux,
George C. Schatz & Chad A. Mirkin
Department of Chemistry and Institute for Nanotechnology, Northwestern
University, Evanston, Illinois 60208, USA

Inorganic nanoparticles exhibit size-dependent properties that are of interest for applications ranging from biosensing1–5 and catalysis6 to optics7 and data storage8. They are readily available in a wide variety of discrete compositions and sizes9–14. Shapeselective synthesis strategies now also yield shapes other than nanospheres, such as anisotropic metal nanostructures with interesting optical properties15–23. Here we demonstrate that the previously described photoinduced method23 for converting silver nanospheres into triangular silver nanocrystals—so-called nanoprisms—can be extended to synthesize relatively monodisperse nanoprisms with desired edge lengths in the 30–120nm range. The particle growth process is controlled using dual-beam illumination of the nanoparticles, and appears to be driven by surface plasmon excitations. We find that, depending on the illumination wavelengths chosen, the plasmon excitations lead either to fusion of nanoprisms in an edge-selective manner or to the growth of the nanoprisms until they reach their lightcontrolled final size.

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另一出色的相似工作见NanoLetters.

Nano Letters, 3 (11), 1565 -1568, 2003. 10.1021/nl034757a S1530-6984(03)04757-X
Web Release Date: October 21, 2003

Copyright © 2003 American Chemical Society

[size=5]Photochemically Grown Silver Nanoparticles with Wavelength-Controlled Size and Shape [/size]
A. Callegari,* D. Tonti, and M. Chergui

Institut de Physique de la Matiére Condensée, Université de Lausanne, CH-1015 Lausanne, Switzerland

Received September 9, 2003

Abstract:

We use light to transform a colloidal solution of spherical silver nanoparticles into larger nanoparticles of a different shape. The particle size and shape can be controlled by choosing the wavelength(s) of light used to drive the photochemical growth. These findings suggest a new way of thinking about growth of nanoparticles in solution and show the exciting possibility that light can be used as a major control parameter in metallic nanoparticle growth reactions.

have a look ,thanks!

:lol ，谢谢分享，:victory:

好东西，多谢分享！！！

回复 #1 rabbithong 的帖子

好!
We use light to transform a colloidal solution of spherical silver nanoparticles into larger nanoparticles of a different shape. The particle size and shape can be controlled by choosing the wavelength(s) of light used to drive the photochemical growth. These findings suggest a new way of thinking about growth of nanoparticles in solution and show the exciting possibility that light can be used as a major control parameter in metallic nanoparticle growth reactions.

:victory: :victory:

very interesting works!

Reply #1 rabbithong's post

:victory: :victory:

Thanks for sharing

题目不错，值得看看！

good! thanks!