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Halide Ion Effect in Shape Transformation from Silver Triangular Nanoprisms to Silver Nanodisks

Published online by Cambridge University Press:  31 January 2012

Israel A. López  and
Idalia Gómez
Israel A. López
Affiliation:
Laboratorio de Materiales I, Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, 66475, San Nicolás de los Garza, Nuevo León, México
Idalia Gómez
Affiliation:
Laboratorio de Materiales I, Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, 66475, San Nicolás de los Garza, Nuevo León, México
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Abstract

Silver triangular nanoprisms (TNP’s) were transformed into silver nanodisks (NDK’s) by addition of halide ion solution (chloride, bromide and iodide). The shape transformation of the TNP’s is due to the selective etching effect of halide ions at their vertices. TNP’s were synthesized via a photoinduced growth process, and then different concentrations of potassium halide solutions were added into the TNP’s colloids under vigorous stirring. Images of the obtained nanoparticles were recorded by scanning electron microscopy (SEM). The shifts of the in-plane dipole plasmon resonance band allow us to identify the differences among the three halides. These differences might be due to the distinct sizes of halides, and the solubility product constant values of each silver halide. We found that the etching ability of the halides, at a concentration of 1.0 mM, to truncate the vertices of TNP’s is in the order of Br- > Cl- > I-. In contrast, at a concentration of 0.01 mM, the order of the etching ability is Br- > I- > Cl-.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1371: Symposium S1 – Nanostructured Materials and Nanotechnology , 2012 , imrc11-1371-s1-p027
Copyright
Copyright © Materials Research Society 2012

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