Photoinitated charge separation in a hybrid titanium dioxide metalloporphyrin peptide material
Photoinitated charge separation in a hybrid titanium dioxide metalloporphyrin peptide material
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DOI：
10.1038/ncomms5606
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发表时间：
2014-08-01
影响因子：
16.6
通讯作者：
Rajh, Tijana
中科院分区：
文献类型：
--
作者：
Fry, H. Christopher;Liu, Yuzi;Rajh, Tijana
在自然系统中，电子流是由蛋白质介导的，蛋白质在空间上以很高的精度组织供体和受体分子。实现这种引导的、定向的信息流动是光伏媒体的一个理想特征。在这里，我们设计自组装肽材料，组织多个电子元件能够进行光诱导电荷分离。两种肽c16-阿勒（3）K（3）-CO2 H和c16-阿勒（3）K（9）-CO2 H自组装成纤维，并提供能够通过组氨酸轴向连接结合金属卟啉的支架，并在所得纤维结构的富含赖氨酸的表面上矿化二氧化钛（TiO 2）。这种自组装材料在连续光激发下的电子顺磁共振研究表明，由金属卟啉的激发和介导的肽组装结构引起的电荷分离。这种染料敏化半导体材料的方法提供了一种通过仔细的策略性肽设计相对于半导体材料空间控制染料分子的方法。
In natural systems, electron flow is mediated by proteins that spatially organize donor and acceptor molecules with great precision. Achieving this guided, directional flow of information is a desirable feature in photovoltaic media. Here, we design self-assembled peptide materials that organize multiple electronic components capable of performing photoinduced charge separation. Two peptides, c16-AHL(3)K(3)-CO2H and c16-AHL(3)K(9)-CO2H, self-assemble into fibres and provide a scaffold capable of binding a metalloporphyrin via histidine axial ligation and mineralize titanium dioxide (TiO2) on the lysine-rich surface of the resulting fibrous structures. Electron paramagnetic resonance studies of this self-assembled material under continuous light excitation demonstrate charge separation induced by excitation of the metalloporphyrin and mediated by the peptide assembly structure. This approach to dye-sensitized semiconducting materials offers a means to spatially control the dye molecule with respect to the semiconducting material through careful, strategic peptide design.