Studies of Self-Assembly of Block Copolymers in Confined Geometries and the Application of Gold Nanostructures

• Main Authors: Yao, I-Chun, 姚奕群
• Other Authors: Chen, Jiun-Tai
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/18175061483748608352

博士 === 國立交通大學 === 應用化學系碩博士班 === 105 === In recent years, the phase separation and self-assembly behavior of block copolymers have attracted wide attention. Because block copolymers can self-assemble into nano-scale ordered structures, they can be applied in applications such as organic solar cells, drug devilry, and data storage. They can phase separate into morphologies such as lamella, cylinder, and sphere. In the past, most researches of block copolymers focus on the bulk behavior. Recently, there have been more studies on the self-assembly behavior of block copolymers in confined geometries. Special phase-separated morphologies, which have not been observed in the bulk state, have been observed in confined geometries. Despite this, the phase-separated morphologies of block copolymers in confined geometries are still not fully understood. The main goal of this work is to study the phase separation and self-assembly of block copolymers confined in the cylindrical nanopores of anodic aluminum oxide (AAO) templates. We use polystyrene-block-poly-4-vinylproediene (PS-b-P4VP) as the materials, which form cylindrical morphology on flat substrates. After the PS-b-P4VP chains are introduced into the nanopores using a special solvent-annealing-induced nanowetting in templates (SAINT) method, the AAO templates can be selectively removed. Because of the confined environment of the cylindrical nanopores, one-dimensional block copolymer nanorods or nanotubes can be prepared. We find that the morphologies of the block copolymer nanostructures depend on the types of the annealing solvents. For example, when toluene is used as the annealing solvent, block copolymer nanotubes can be fabricated. In addition, we also develop a hyper process to effectively separate gold nanostructures with different sizes and shpes. The purified gold nanostructure can establish a well-fined relationship between gold nanostructures and block copolymers and to explore the usage of hybrid materials in technological applications. In the future, we will study the confinement effect further by using AAO templates with different pores diameters. The block copolymer nanostructures will also be applied to applications such as local surface plasmon resonance.