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02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Synthesis and Structural Properties of Multicomponent Nanodots Assemblies Core - Silica Shell Nanosystem
2015년 2월 26일 15시 53분 30초
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목 10시 : 00분
Oral Presentation for Young International Chemists
한림대학교 화학과, Korea
Highly spherical nanoparticles with a core comprising multiple gold (Au) or platinum (Pt) nanodots assembly and a silica shell (multi-Au@SiO2 NPs, multi-Pt@SiO2 NPs, multi-Au/Pt@SiO2 NPs, and multi-Pt@SiO2 NCs (NCs; nanochains) were successfully synthesized through a reverse (water-in-oil) microemulsion-based method. The microemulsion was prepared by mixing a surfactant (Brij35), cyclohexane, n-hexanol, and aqueous HAuCl4 and K2PtCl4 solutions. Multiple Au-nanodots with a maximum diameter of ~5 nm could be assembled and encapsulated within a silica matrix during the growth process. For investigation the availability of multi-Au@SiO2 NPs, we generated multiple gold (Au) nanodots core-mesoporous silica shell nanoparticles (multi-Au@mesoporous-SiO2 NPs) without using any surface-protective or etching agents. Thermal treatment of multi-Au@SiO2 NPs in an aqueous media lead to generation of mesopores silica shell without any other morphology changes. The multi-Au@mesoporous-SiO2 NPs showed much higher catalytic activity in the reduction of 4-aminophenol than multi-Au@SiO2 NPs and other single Au nanodot core-silica shell nanoparticles with yolk-shell morphologies, which were also effectively fabricated. Multi-Pt@SiO2 NPs and multi-Pt@mesoporous-SiO2 NPs were also prepared through the similar synthetic strategies to the Au counterparts. As for the multi-Pt@SiO2 NCs - they were also synthesized through a reverse (water-in-oil) microemulsion-based method in the presence of HCl (aq.). By changing pH of the reaction media we could successfully synthesize the Pt nanoparticle-embedded silica nanochains with the average width of was 20 nm. The kinetically controlled reduction of K2PtCl4 and HAuCl4 by Brij35 surfactant within reverse micelles, followed by condensation of TEOS, led to the formation of hybrid multi-Au/Pt@SiO2 NPs multiple metal core-silica shell systems. The average diameter of Pt nanodots were ~2 nm and of Au nanodots were ~5 nm. Pt-nanoparticles were much more dominant comparatively. Further increasing of the temperature is hopefully going to generate the yolk-shell and mesoporous multi-Pt@SiO2 assemblies systems that could be in future applied in particular as part of promising functional nanomaterials for a variety of applications such as catalysis.
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