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RISS 인기검색어
- 검색키워드
- 저자 : Paul Mulvaney (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Core-shell 구조의 Au/TiO<sub>2</sub> 나노 미립자의 합성 및 특성 평가
유연태,Paul Mulvaney 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.9
Au/TiO$_2$ core-shell 구조 나노 미립자가 졸-겔법에 의해서 제조되었고, TiO$_2$ shell의 형상과 결정성이 TEM과 UV-Vis. absorption spectrometer에 의해서 조사되었다. Au/TiO$_2$ core-shell 나노 미립자는 Au 콜로이드 에탄올 수용액 중에서 TOAA(Titanium Oxide Acethylacetonate)의 가수분해에 의해 합성될 수 있었다. Au 나노 미립자의 표면에 형성된 TiO$_2$ shell의 두께는 약 1 nm이었다. TiO$_2$ shell의 결정성을 조사하기 위하여. TiO$_2$가 피복된 Au 콜로이드 에탄올 용액에 254 nm의 자외선과 $^{60}$Co의 방사선을 조사하였다. Au 나노 미립자의 surface plasmon 현상은 방사선이 조사되었을 때만 나타났고, 이 결과로부터 TiO$_2$ shell은 비정질 상태임을 알 수 있었으며, Au의 분산성 향상을 위해 표면에 처리된 MUA(Mercaptoundecanoic Acid)층은 전자의 이동을 방해하는 장애물로 작용하지 않음을 확인할 수 있었다. 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.
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Synthesis and Characterization of Au/TiO₂, Core-shell Structure Nanoparticles
Yu, Yeon-tae,Mulvaney, Paul 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6
Au/TiO₂ core-shell structure nanoparticles were synthesized by sol-pel process, and the morphology and crystallinity of TiO₂ shell were investigated by TEM and UV-vis absorption spectrometer. Au/TriO₂ core-shell structure nanopanticle could be prepared by the hydrolysis of TOAA (titanium oxide acethylacetonatc) in gold sol ethanol solution with water. The thickness ui TiO₂ shell on the surface of gold particles was about 1 ㎚. To investigate the crystallinity of TiO₂ shell, UV light with 254 ㎚ and radioactive ray of ^(60)Co uerr imdiuted on the TiO₂-coated gold sol ethanol solution. The surface plasmon band of gold nanopmicles appeared only when the radioactive ray was irrdiated on the TiO₂-coated gold sol ethanol solution. From these results, it was found that the TiO₂ shell was amorphous end the MUA (mercaptoundecanoic acid) layer on the Au particle for its dispersion in ethanol did not act as an obstacle to disturb the movement of electrons onto the surface of Au panicles.
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