2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Surfactant Headgroup-Dependent Growth of Large-Aspect-Ratio Single-Crystalline Gold Nanorods and Their Linear Assembly

Xiaoshan Kou, Man Hau Yeung, Jianfang Wang
Miss, HK

Keywords:
surfactant, gold nanorods, assembly

Abstract:
Gold nanorods have great potentials in optical, optoelectronic, and biotechnological applications because gold is chemically inert, biologically compatible, and gold nanorods exhibit rich localized surface plasmon properties. To fully realize their potential applications, gold nanorods of narrow size distributions and plasmon wavelengths tunable from the visible to infrared spectral range are strongly desired. We have recently developed methods for the preparation of nearly monodisperse gold nanorods in high yields. Specifically, we have used cetyltrialkylammonium bromide surfactants with increasingly larger headgroups to grow single-crystalline gold nanorods of average aspect ratios from 2 to 70 (corresponding plasmon wavelengths from ~ 600 nm to ~ 3 m). Moreover, we have developed an approach for the continuous shortening of single-crystalline gold nanorods through mild oxidation. The shortening rate can be controlled by temperature and acid concentration. With this shortening approach, gold nanorods of any aspect ratio below that of the starting nanorods can be produced. Furthermore, we have used glutathione and cysteine to assemble gold nanorods and nanospheres in a linear fashion into necklace structures. Taken together, our developed growth, shortening, and assembly approaches will facilitate the use of gold nanorods in the areas of optics, optoelectronics, and biotechnology.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors Keywords

Nanotech 2007 Conference Program Abstract

 
 

Names, and logos of other organizations are the property of those organizations and not of NSTI.
This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.