123rd General Meeting of the KCS

Type Poster Presentation
Area Analytical Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code ANAL.P-270
Subject Single-Molecule Nanocatalysis for Location Effect of Gold Nanoparticle on Carbon Nanotube
Authors Yingying Cao, Jongyeon Yoon1, Seong Ho Kang1,*
Chemistry, Kyung Hee University, Korea
1Department of Applied Chemistry, Kyung Hee University, Korea
Abstract 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.
E-mail caoying0514@gmail.com