Abstract
AbstractThree kinds of binary mixed self-assembled monolayers on gold were prepared: 12-(4-pyridyl) dodecanethiol / dodecanethiol, methyl 16-mercaptohexadecanoate / 16-mercapto-1-hexadecanol, and hexadec-15-yne-1-thiol / dodecanethiol in different ratios. The compositions of these mixed-monolayers were measured by means of infrared reflection spectroscopy (IRS). The structure of the mixed monolayers formed by co-adsorption was compared with that formed by exchange experiment, through analysis of the characteristic absorption frequencies. The results of current study indicated that the ratio of the different components on the gold surface is related to the composition of solutions.Among the different combinations studied, the mixed layer of methyl 16-mercaptohexadecanoate / 16-mercapto-1-hexadecanol, and hexadec-15-yne-1-thiol / dodecanethiol displayed homogeneous distribution of the two component on the gold surface, while the distribution of 12-(4-pyridyl) dodecanethiol / dodecanethiol was ambiguous.On a surface patternized with 12-(4-pyridyl) dodecanethiol and dodecanethiol as a template for the growth of (([Ag5(Bpy-(HC2H-Bpy)2)2])n(CF3SO3)5n)) complex, the silver helical complex grew selectively on the pyridyl-bearing SAM surface.Growth of Ag2S nanoparticles on a SAM of hexadec-15-yne-1-thiol was carried out by derivatizing the terminal acetylene group with silver ion and followed by H2S exposure. The presence of silver sulfide was evidenced by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and transmittance electron microscopy (TEM) imaging. Attempts to vary the size of the nanoparticles by chemical or thermal process were also carried out.