报告题目：Hierarchical and MultifunctionalAssembly of Carbon Nanotubes as a Platform for Sensor Application
报 告 人： Prof. Haiwon Lee
Hanyang University, Korea
邀 请 人：孙俊奇教授
Prof. LEE Haiwon is a member of the Chemistry Department and the Institute of Nano Science and Technology in Hanyang University in Seoul since 1993. He was the head of Institute of Nano Science and Technology (INST) in Hanyang University 2004-2012 and the President of Korea Nanotechnology Research Society 2013-2015. He received his Ph.D. in Chemistry from the University of Houston in the US in 1986. His research focuses on functional materials for nanostructured devices, nanolithography, sensors and battery electrodes based on carbon nanotubes, and microfluidic system. He is active in various national and international organizations. Currently he is the President of Asian Research Network Korea and member of the National Academy of Engineering of Korea. Dr. Lee is the recipient of HYU Distinguished Professor Award from Hanyang University 2008 and Doyak Medal from the Order of Science and Technology Merit of Korean Government 2016. He is the Founder & Organizer of Asian Science and Technology Innovation Forum as well as Founder & President of Asian Research Network Korea. Email: email@example.com web: http://otfl.hanyang.ac.kr
Carbon nanotubes (CNTs) have shown superior intrinsic properties attractive for various potential applications. By creating nanostructures, it is possible to control the fundamental properties of materials even without changing the materials' chemical composition. Novel methods to assemble CNTs into hierarchical arrays with controllable shape, location, orientation, and density are needed. Three types of hierarchical and multifunctional three-dimensional (3D) carbon nanotube structures have been developed for various applications. The first type is 3D-network of CNTs (3DNC) structures which comprised of suspended and interconnected CNTs between Si pillars. The second and third types are highly ordered CNT walls assisted by Si pillar arrays and open-cell like CNT structures, respectively, and these two types were obtained by capillary force driven self-assembly. Limited by the graphitic surface structure of CNTs and pillar structure, the surface of 3D CNTs is hydrophobic so that its applications are limited. Non-covalent surface modification methods, like physical vapor depositions, chemical vapor depositions, electrochemical depositions and polymer coatings, are used to functionalize the 3D CNTs. For instance, the 3DNC is coaxially coated with Al2O3 by atomic layer deposition process to prevent the undesired aggregation or breaking of suspended CNTs in a microfluidic filtration chip, and this Al2O3 coated 3DNC can be functionalized by surface modification as a biosensor platform for the detection of cancer biomarkers and surfactin-producing bacterial strains with high sensitivity. A new color sensor platform immobilized with polydiacetylene vesicles on 3D CNTs structures shows an excellent sensitivity with selectivity enhancement for cyclodextrin recognition. Hierarchical 3DNC structures and open-cell like CNT structures are also investigated as potential candidates for supercapacitor and stain sensor.