报告题目：Hierarchical and Multifunctional Assembly of Carbon Nanotubes as a Platform for Sensor Application

报 告 人： Prof. Haiwon Lee

                     Hanyang University, Korea

报告地点：无机超分子楼二楼圆形报告厅

报告时间：2018年10月23日下午3:00（星期二）

邀 请 人：孙俊奇教授

报告人简介：

Haiwon Lee, Distinguished Professor, Department of Chemistry, Hanyang University, Korea

Professional Preparation:

•University of Houston, Houston, Texas, USA, Ph.D., Chemistry 1986

Research Interests

: Surface morphology, force & I-V measurement, AFM lithography

: Photoresist, nanolithography, thin film deposition, surface modification

: Molecular assemblies, early cancer diagnosis, immunoassay, microfluidic chip

: Sensors, Li battery and hydrogen fuel cell

Awards:

2016, Doyak Medal, The Order of Science and Technology Merit of Korean Government

2008, HYU Distinguished Professor, Hanyang University

报告摘要：

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.