The ability to synthesize, from atoms, metal nanoparticles of various kinds with desired size are the rudimentary target of the research. Self-assembled monolayer make from alkanethiols and adsorbed on gold substrate is an important application of the succeed research work. There was another finding that the size of the self-assembled gold nanoparticles could be controlled with the mole ratio between AuCl4- and thiol. It was the higher the mole ratio between AuCl4- and thiol, the larger the self-assembled gold nanoparticles. The finding was proved through past experiments. In this paper, how the effect which is caused from the changing of the mole ratio between AuCl4- and thiol affects the self-assembly of thin film is discussed.
In this study, the size disparity of Au nanoparticles is controlled in the range between 2nm - 6nm. The Au thin film is made accordingly. The thin film with differences cause by the mole ratio of Au and thiol in 1:64, 1:32, 1:16, 1:8, 1:1, 3:1, 5:1, 8:1, respectively, will be observed by HR-TEM. It results to the conclusion that the control capability on the fabrication of particle size is an important issue that should be resolved. The result is the larger size of the gold nanoparticles produced the better array gold nano-thin film is resulted. The self-assembly of nano-structure produced by different size of nanoparticles also be observed. The obtained nanoparticle networks could be used in surface nanofabrication, leading to the fabrication of ordered arrays of metal quantum dots.
Keywords: nanoparticles, self-assembly, mole ratio, AuCl4-, thiol, HR-TEM, nano-structure, arrays of metal quantum dots
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