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http://dx.doi.org/10.3740/MRSK.2006.16.12.754

The Effect of Mercaptoundecanoic Acid (MUA) Coating on Dispersion Property of Au Nanoparticles in Synthesis of Au/TiO2 Core-shell Nanoparticles  

Yu, Yeon-Tae (Division of Advanced Materials Engineering, Research Center for Industrial Technology, Chonbuk National University)
Kim, Byoung-Gyu (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Korean Journal of Materials Research / v.16, no.12, 2006 , pp. 754-760 More about this Journal
Abstract
Mercaptoundecanoic acid (MUA) has been used to enhance the dispersity of Au nanoparticles in organic solvent and the affinity between the Au nanoparticles surface and titanium dioxide shell in the synthesis of $Au/TiO_2$ core-shell composite nanoparticles. The dispersity of the MUA-coated Au nanoparticles in ethanol aqueous solution with different concentration of $H_2O$ was investigated by UV-Vis. absorption spectrum and the coating amount of MUA was varied from 0.02 mM to 1.0 mM. The MUA-coated Au nanoparticles were highly dispersed in pure $H_2O$ in the wide range of the coating amount of MUA. On the contrary, the MUAcoated Au nanoparticles showed an enhanced stability in the ethanol/$H_2O$=8/2 mixed solution only when the coating amount of MUA was 0.05 mM, and in the ethanol/$H_2O$=7/3 mixed solution when the coating amount of MUA was in the range from 0.02 mM to 0.17 mM. From this systematic study, it can be inferred that the stability and the dispersibility of Au nanoparticles in organic solvents are highly sensitive towards the amount of MUA coating.
Keywords
Au colloid; dispersion; ethanol; core-shell nanoparticle; mercaptoundecanoic acid;
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