Radical/Ion-Containing Block Copolymers: Self-Assembly and Application toward Organic Devices

通过离子液体辅助自组装，用氧化还原活性自由基和电荷补偿离子基团成功地实现了嵌段共聚物模板的精细结构。所获得的含有TEMPO-IL - 1的PS-b-PEO层在有机薄膜器件中表现出形态驱动的电荷输运调制（开/关开关）。自由基和离子分子的位置与电阻性记忆特性（可重写/WORM等）相关。应用开尔文探针力显微镜（KPFM）技术和导电原子力显微镜（AFM）观察了程序偏压下微畴局部表面电位和局部电导率的变化。通过可控自由基聚合和开环复聚合成了自由基官能化嵌段共聚物和离子官能化嵌段共聚物，并将其用作有机记忆的活性层。

A well-defined mesostructure of block copolymer templates was successfully functionalized with redox-active radicals and charge-compensating ionic groups via ionic liquid-assisted self-assembly. The obtained PS-b-PEO layer containing TEMPO-IL 1 exhibited morphology-driven modulation of charge-transport (on/off switching) in an organic thin film device. Location of radical and ionic molecules was correlated with resistive memory characteristics (rewritable/WORM, etc). We applied Kelvin Probe Force Microscopy (KPFM) technique and conductive AFM to visualize local surface potential and local conductivity change of microdomains under the programmed bias. Radical- and ion-functionalized block copolymers were also synthesized via controlled radical polymerization and ring-opening metathesis polymerization, and utilized as the active layer for organic memory.