光化学"三极管"分子信号转换器
Amy E Keirstead1, James W Bridgewater, Yuichi Terazono
1Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA.
Journal of the American Chemical Society
|April 23, 2010
概括
研究人员开发了一种分子六极管,它像晶体管一样起作用. 这种分子控制光的发射,使调制光用于先进的生物分子和纳米技术应用.
科学领域:
- 超分子化学 超分子化学
- 摄影化学的使用.
- 分子电子学分子电子学
背景情况:
- 双乙烯 (BPEA) 光体因其发光特性而闻名.
- 乙乙烯光色素可以在光照射后在开放和封闭的形式之间切换.
- 集成多个功能单元的分子系统对于开发先进光学设备至关重要.
研究的目的:
- 合成和表征一种新型分子六合体,集成BPEA光体和dithienylethene光色素.
- 为了研究六边体内的光物理性质和能量转移动态.
- 为了证明六边形作为类似于晶体管的分子开关的潜力.
主要方法:
- 合成一个包含五个BPEA单元和一个dithienylethene单元在一个hexaphenylbenzene核心周围的hexad.
- 时间分辨率光谱学用于在皮秒时间尺度上研究单点单点的能量转移.
- 使用紫外线光的二乙烯的光化学异构化和随后的光火的分析.
- 使用稳态和调制光源进行调制实验,以证明类似晶体管的行为.
主要成果:
- 在具有特征时间尺度的BPEA单元中观察到高效的单元-单元能量传输.
- 在BPEA单元在开放形式的dithienylethene的存在下表现出高光量子产量.
- 对封闭形式的二甲基乙烯的光异构化导致BPEA光通过能量转移强烈灭.
- 六极管通过外部光信号证明了光强度的晶体管式调制,显示频率,振幅和相位调制.
结论:
- 合成的分子六倍数作为光控制开关,类似于三极管真空管或晶体管.
- 该系统允许使用更长波长的光来调节强烈的,较短波长的光.
- 这种光化学控制机制有望在不干扰生物分子和纳米技术系统的情况下用于光检测.
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