人工光采集阵列:电子能量迁移和捕获在球体上和球体之间
Julien Iehl1, Jean-François Nierengarten, Anthony Harriman
1Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France.
Journal of the American Chemical Society
|December 14, 2011
概括
研究人员使用二甲 (Bodipy) 染料制造了一个C(60) 纳米粒子天线. 这个系统模仿了自然的采光复合体,并使光细胞敏感.
科学领域:
- 材料科学 材料科学 材料科学
- 摄影化学的使用.
- 超分子化学 超分子化学
背景情况:
- 自然光采集天线有效地捕获和传输太阳能.
- 富勒 (C60) 衍生物为人工系统提供独特的电子和结构性质.
- 二甲基 (Bodipy) 染料以其光物理特性和稳定性而闻名.
研究的目的:
- 开发一种新的人工光采集系统,使用C60纳米粒子与Bodipy染料装饰.
- 研究装饰纳米粒子内部和之间能量传递机制.
- 评估这些系统在提高光伏设备灵敏度方面的潜力.
主要方法:
- 用黄色和蓝色Bodipy染料装饰的C60六合添加物的合成.
- 稳态和时间分辨率光谱学用于研究能量转移.
- 通过螺旋涂层制备含有装饰C60纳米颗粒的聚合物薄膜.
- 制造和测试由纳米粒子敏感的无形光电池.
主要成果:
- C60核没有参与光诱导的电子转移,但促进了能量转移.
- 从黄色到蓝色的Bodipy染料中观察到有效的粒子内和粒子间能量转移.
- 装饰着纳米颗粒的聚合物薄膜模仿了自然光采集复合体,使得远程能量迁移成为可能.
- 装饰的纳米粒子成功地使无形光细胞敏感.
结论:
- 使用装饰的C60纳米粒子成功构建了一个功能性的人工光采集系统.
- 该系统展示了高效的能量迁移途径,类似于自然光合作用系统.
- 这些工程纳米粒子显示了太阳能转换应用的前景,特别是对光电细胞的敏感化.
相关概念视频
01:15The Antenna Complex
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
01:35Light as Energy
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
01:27Photosystem I
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
01:22Photosystem II
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
01:34The Z-Scheme of Electron Transport in Photosynthesis
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
01:32Photosystems
Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...