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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 Single-Molecule Nanocatalysis for Location Effect of Gold Nanoparticle on Carbon Nanotube

2019년 2월 11일 14시 05분 18초
ANAL2.O-8 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 09시 : 28분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
Yingying Cao, Jongyeon Yoon1, Seong Ho Kang1,*
Chemistry, Kyung Hee University, Korea
1Department of Applied Chemistry, Kyung Hee University, Korea
Gold nanoparticles were immobilized on carbon nanotubes by two ways: filling of Au nanoparticles inside the CNT channels (Au/CNTs-in) by capillary action and dispersion of Au nanoparticles on the exterior surfaces of CNTs (Au/CNTs-out) by block the CNT channels. The locations of Au nanoparticles were confirmed by transmission electron microscopy (TEM). Ensemble catalytic activity measurements by UV-vis absorption spectrometer indicated that Au/CNTs-out had the higher catalytic activity than Au/CNTs-in. Single-molecule nanocatalysis experiments were carried out by lab-built prism-type total internal reflection fluorescence microscope (TIRFM) to reveal the location effect between Au/CNTs-in and Au/CNTs-out. The results indicated that Au/CNTs-out was more activity than Au/CNTs-in in reductive N-deoxygenation reaction of resazurin to resorufin. Furthermore, the product molecules on both Au/CNTs-out and Au/CNTs-in preferred the same pathway, reactant-assisted dissociation pathway, but different dissociation rates. The different catalytic performances of Au/CNTs-in and Au/CNTs-out were related to the electron density of Au nanoparticles caused by the its location and nature of CNTs.