侧链替代剂对二胺分子自我组装的作用:形态控制
Kaushik Balakrishnan1, Aniket Datar, Tammene Naddo
1Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA.
Journal of the American Chemical Society
|June 1, 2006
概括
二胺分子中的侧链工程决定了自我组装形态. 在DD-PTCDI和ND-PTCDI上的不同侧链分别导致1D纳米带和0D纳米粒子,影响光学特性.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 超分子化学 超分子化学
背景情况:
- 二胺 (PTCDI) 分子由于其光物理性质,在有机电子中至关重要.
- 控制PTCDI衍生品的自我组装是调整其性能的关键.
- 侧链工程提供了一条影响分子包装和聚合物形态的途径.
研究的目的:
- 研究PTCDI分子上的不同侧链置换如何影响它们的自我组装形态.
- 为了比较N,N'-di(dodecyl) -perylene-3,4,9,10-tetracarboxylic diimide (DD-PTCDI) 和N,N'-di(nonyldecyl) -perylene-3,4,9,10-tetracarboxylic diimide (ND-PTCDI) 的自组装行为.
- 了解分子结构,聚合物形态和光学特性之间的关系.
主要方法:
- 合成了两个具有不同的侧链的PTCDI衍生品:DD-PTCDI和ND-PTCDI.
- 使用扫描电子显微镜 (SEM),传输电子显微镜 (TEM),原子力显微镜 (AFM) 和光显微镜进行自我组装形态的表征.
- 通过基于溶液的加工和溶剂蒸汽回火制造自组件的制造.
- 使用紫外线吸收,光谱学,X射线衍射和差分扫描热量计 (DSC) 调查分子相互作用.
主要成果:
- DD-PTCDI自组装成一维 (1D) 的纳米带,而ND-PTCDI形成零维 (0D) 的纳米粒子.
- DD-PTCDI的纳米带表现出高稳定性,可以转移到各种表面.
- DD-PTCDI聚合物显示出排放中显著的红色偏移 (约. 与ND-PTCDI相比,排放量子产量减少了三倍,这是由于更有利的pi-pi堆叠.
- 与ND-PTCDI聚合物不同,DD-PTCDI聚合物显示出明显的长波长吸收波段.
结论:
- 侧链结构关键控制PTCDI分子的自我组装形态,导致不同的1D纳米带和0D纳米粒子结构.
- 观察到的形态和光学特性 (排放转移,量子产量,吸收) 的差异与分子堆叠中侧链诱导的变化直接相关.
- 这些发现强调了侧链工程对于设计基于PTCDI的材料具有量身定制的自组装和光电子特性的重要性.
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