| Core-shell 구조의 Au/TiO2 나노 미립자의 합성 및 특성 평가 |
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| Synthesis and Characterization of Au/TiO2 Nanoparticles with Core-shell Structure |
| 유연태 , Paul Mulvaney 1 |
한국지질자원연구원 자원활용소재연구부
1School of Chemistry, University of Melbourne |
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| ABSTRACT |
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Au/TiO$_2$ core-shell structure nanoparticles were synthesised by sol-gel process, and the morphology and crystallinity of TiO$_2$ shell were investigated by TEM and UV-Vis. absorption spectrometer. Au/TiO$_2$ core-shell structure nanoparticles could be prepared by the hydrolysis of TOAA (Titanium Oxide Acethylacetonate) in Au colloid ethanol solution with $H_2O$. The thickness of TiO$_2$ shell on the surface of Au particles was about 1 nm. To investigate the crystallinity of TiO$_2$ shell, UV light with 254 nm and radioactive lay of $^{60}$ CO were irradiated on the TiO$_2$ coated Au colloid ethanol solution. The surface plasmon phenomenon of Au nanoparticles appeared only when the radioactive lay was irradiated on the TiO$_2$ coated Au colloid ethanol solution. From these results, it was found that the TiO$_2$ shell was amorphous and the MUA (Mercaptoundecanoic Acid) layer on the Au particle for its dispersion didn't act as an obstacle to disturb the movement of electron onto the surface of Au particle. |
| Key words:
Core-shell structure nanoparticle, Gold, Titania, Crystrallinity |
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