Studies on 2D hybrid films of half surfactant-covered Au nanoparticles at the air/water interface

Shufeng Pang; Oikawa Tetsuya; Watanabe Tomoyuki; Takeshi Kondo; Takeshi Kawai

doi:10.1016/j.jcis.2004.11.071

Studies on 2D hybrid films of half surfactant-covered Au nanoparticles at the air/water interface

J Colloid Interface Sci. 2005 May 15;285(2):634-9. doi: 10.1016/j.jcis.2004.11.071.

Authors

Shufeng Pang¹, Oikawa Tetsuya, Watanabe Tomoyuki, Takeshi Kondo, Takeshi Kawai

Affiliation

¹ Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku, Tokyo, Japan.

PMID: 15837481
DOI: 10.1016/j.jcis.2004.11.071

Abstract

A hybrid monolayer film of Au nanoparticles, half-covered with dioctadecyldimethylammonium chloride (DODAC), was prepared at the air/water interface and characterized using transmission electron microscopy (TEM), a quartz-crystal microbalance, and infrared spectra measurements. TEM images of the hybrid film showed that the distribution of Au nanoparticles depends on the surface density of DODAC and reaction time. IR spectral data provided evidence for a surface-enhanced effect of the Au nanoparticles. The wavenumber of CH(2)-stretch vibrations of DODAC in the infrared external reflection spectra revealed that the DODAC molecules were adsorbed onto the Au nanoparticles in a close-packed crystalline state for any surface density of DODAC, which is different from the usual behavior of Langmuir monolayers.