对分子电子学的扩展型四亚富烯十字形分子进行全面研究:合成和电传输测量
Christian R Parker1, Edmund Leary, Riccardo Frisenda
1Department of Chemistry & Center for Exploitation of Solar Energy & Nano-Science Center & Danish-Chinese Center for Nano-Electronics, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.
研究人员为分子电子学合成了十字形分子. 导电性测量显示了自组装单层和单分子连接之间的差异,突出了接口和包装效应.
科学领域:
- 分子电子学分子电子学
- 有机电子学有机电子学
- 超分子化学 超分子化学
背景情况:
- 具有直角 π 结合系统的十字形分子对分子电线有希望.
- 奥利戈乙烯 (OPE) 和四甲 (TTF) 支架提供可调节的电子特性.
- 乙保护的硫酸盐使得用于设备制造的电极固定成为可能.
研究的目的:
- 合成和描述用于分子电子学的新型十字形分子.
- 研究这些分子的导电,光物理和电化学特性.
- 比较自组装单层 (SAM) 和单分子结的导电量测量.
主要方法:
- 合成基于OPE和TTF的十字形分子与硫酸盐末端组.
- 导探探头原子力显微镜 (CP-AFM) 在 SAM 上.
- 机械控制断裂结 (MCBJ) 和扫描道显微镜断裂结 (STM-BJ) 在单个分子上的测量.
主要成果:
- 在OPE分子中,CP-AFM显示与dithiafulvene (DTF) 单元的导电性增加.
- 在单分子测量中,DTF单元降低了连接形成的概率.
- 与SAM结果不同的是,单分子导电性在很大程度上不受DTF单元的影响.
结论:
- 导电率的差异来自于SAM中的分子-电极接口和分子包装.
- 直接比较SAM和单分子测量需要仔细考虑实验条件.
- 这项研究提供了对复杂分子电线中的结构属性关系的见解.
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