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Science 30 November 2001:
Vol. 294. no. 5548, pp. 1901 - 1903
DOI: 10.1126/science.1066541
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Reports

Photoinduced Conversion of Silver Nanospheres to Nanoprisms

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

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 first identification 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.

1 Department of Chemistry and Institute for Nanotechnology,
2 Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
*   To whom correspondence should be addressed. E-mail: camirkin{at}chem.nwu.edu (experimental work) or schatz{at}chem.nwu.edu (theoretical work).

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Science. ISSN 0036-8075 (print), 1095-9203 (online)