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

• Published in: Journal of colloid and interface science Vol. 285; no. 2; pp. 634 - 639
• Main Authors: Pang, Shufeng, Tetsuya, Oikawa, Tomoyuki, Watanabe, Kondo, Takeshi, Kawai, Takeshi
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.05.2005; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; DODAC; Exact sciences and technology; FTIR; General and physical chemistry; Gold nanoparticles; Hybrid monolayer; Physical and chemical studies. Granulometry. Electrokinetic phenomena; QCM; TEM; DODAC; QCM; Hybrid monolayer; TEM; FTIR; Gold nanoparticles; Gas liquid interface; Monolayer; Gold; Film; Nanoparticle; Transition metal; Air water interface; Surfactant; Infrared spectrometry; Transmission electron microscopy
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2004.11.071

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.