121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-134
Subject Self-adsorption of Single-Walled Carbon Nanotubes in Self-Assembled Flavin Monolayer
Authors Junmo Park, Chul-Ho Jun*, Sang-Yong Ju*
Department of Chemistry, Yonsei University, Korea
Abstract Single-walled carbon nanotubes (SWNTs) are one of the nanomaterials widely used in various applications due to their excellent optoelectronic properties. Most applications utilize chemically functionalized substrates to immobilize SWNTs. Despite the importance of the SWNT immobilization on substrate, how SWNT interacts with substrate is largely unknown. In this presentation, we reported the synthesis and characterization of flavin self-assembled monolayer (SAM) and their adsorption behavior with widely used sodium dodecyl sulfate (SDS) dispersed SWNT according to functional group density, electronic types of SWNTs. For this, the flavin-SAM was prepared by either two consecutive steps or direct coupling consisting of i) surface immobilization using an azide group followed by ii) click reaction using acetylene-terminated flavin which is synthesized by two-step synthesis. The tethered flavin on a substrate via two methods (two-step or direct couplings) has been characterized in terms of flavin density. Flavin-SAM prepared by two-step method which exhibits less flavin density possesses higher SWNT assembly as opposed to the directly coupled flavin-SAM. The reason for such behavior was rationalized by the degree of free volume around the immobilized flavin to grasp SWNT. Furthermore, two-step grown SWNT exhibits distinct pseudo first order adsorption kinetics according to electronic types and selectivity of diameter (dt) of SWNT. In particular, SWNT with smaller dt displays full helical assembly of flavin whereas one with larger dt does partial. This study delineates the requirement of SWNT-assembly on the surface and provide an insight for molecular design of the SAM for novel SWNT applications.
E-mail parkjunmo2000@hanmail.net