Nanostructured Thin Films via Self‐Assembly of Block Copolymers

Thin films of incompatible block copolymers self‐assemble into highly regular supramolecular structures with characteristic dimensions in the 10–100 nm regime. There is increasing interest in controlling the resulting structures and utilizing them, for instance in the area of nanotechnology. So far, research has concentrated mainly on exploiting the melt structure of diblock copolymers. Recent work on block copolymer solutions and more complex co‐ and terpolymer architectures has revealed a rich variety of novel thin‐film structures, some of which exhibit high complexity and order. In addition, by use of mean field dynamic density functional theory along with well‐controlled experiments, the fundamentals of thin film structure formation have been elucidated. We highlight some aspects of these studies and point to future directions in this lively field of materials science.     

碲氧溅射薄膜的光学性质

碲氧薄膜是很有希望的可擦写光盘介质材料。本文用射频溅射技术制备碲氧系统的薄膜。测定热处理前后薄膜的光学特性(光透过率、反射率、折射指数、光吸收系数和光能隙)和 X 射线衍射特性,并研究了这些性能与靶材的组份关系,还测定了这些薄膜激光喇曼光谱,并讨论它们的结构特征。     

Templated Self‐Assembly of Block Copolymers: Top‐Down Helps Bottom‐Up

One of the key challenges in nanotechnology is to control a self‐assembling system to create a specific structure. Self‐organizing block copolymers offer a rich variety of periodic nanoscale patterns, and researchers have succeeded in finding conditions that lead to very long range order of the domains. However, the array of microdomains typically still contains some uncontrolled defects and lacks global registration and orientation. Recent efforts in templated self‐assembly of block copolymers have demonstrated a promising route to control bottom‐up self‐organization processes through top‐down lithographic templates. The orientation and placement of block‐copolymer domains can be directed by topographically or chemically patterned templates. This templated self‐assembly method provides a path towards the rational design of hierarchical device structures with periodic features that cover several length scales.