Philippine Science Letters
vol. 3 | no. 1 | 2010
published online May 28, 2010


Morphogenesis of anisotropic gold nanostructures stabilized by the greener ionic liquid 1-butyl-3-methylimidazolium lauryl sulfate

by Judy M. Obliosca1, Ian Harvey J. Arellano1, Michael H. Huang2 and Susan D. Arco1,*

1 Institute of Chemistry, University of the Philippines, Diliman, Quezon City 1101 Philippines 2 Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan



We report the first synthesis of anisotropic gold nanostructures prepared through hydrothermal citrate reduction of HAuCl4 in the presence of a greener ionic liquid 1- butyl-3-methylimidazolium lauryl sulfate. The synthesized nanostructures possess well-defined shape and sharp edges ranging from triangular, truncated triangular and hexagonal geometries with preferred growth along the (111) plane. The morphology of the crystal is conserved except for the occurrence of stacking after prolonged heating emphasizing a preferential growth along the a-b plane. At higher concentration of the ionic liquid, a different geometry, intertwining nanoparticles and nanorods were observed. This elongation was confirmed spectroscopically through the hypsochromic shift of the plasmon band of the nanostructures and evolution of a near- IR peak.

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Submitted: February 25, 2010
Revised: May 11, 2010
Accepted May 11, 2010
Published: May 28, 2010
Editor-in-charge: Eduardo A. Padlan