Gelation enabled charge separation following visible light excitation using self-assembled perylene bisimides

被引:14
作者
Smith, Charlotte L. [1 ,2 ]
Mears, Laura L. E. [1 ,2 ,5 ]
Greeves, Benjamin J. [1 ,2 ]
Draper, Emily R. [3 ]
Doutch, James [4 ]
Adams, Dave J. [3 ]
Cowan, Alexander J. [1 ,2 ]
机构
[1] Univ Liverpool, Stephenson Inst Renewable Energy, Liverpool L69 7ZF, Merseyside, England
[2] Univ Liverpool, Dept Chem, Liverpool L69 7ZF, Merseyside, England
[3] Univ Glasgow, Sch Chem, Coll Sci & Engn, Glasgow G12 8QQ, Lanark, Scotland
[4] Rutherford Appleton Lab, Sci & Technol Facil Council, STEC ISIS Neutron & Muon Source, Didcot OX11 0QX, Oxon, England
[5] Vienna Univ Technol, Inst Appl Phys, A-1040 Vienna, Austria
基金
英国科学技术设施理事会; 英国工程与自然科学研究理事会;
关键词
WATER-OXIDATION; PHOTOCONDUCTIVITY; DIIMIDE; FILMS; HYDROGEL;
D O I
10.1039/c9cp05839g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Perylene bisimides (PBIs) can be functionalised to enable controlled aggregation into complex supramolecular structures and are promising materials for photovoltaic and solar fuel applications. Amino acid appended PBIs such as PBI-alanine (PBI-A) have been found to form photoconductive films containing worm-like structures that enable charge transport. However, despite being strong chromophores in the visible region, when PBI-A films are prepared by drying down solutions, activity only occurs under UV illumination. This limits potential applications. The requirement for UV illumination has previously been suggested to be due to the large ion-pair energy in the low dielectric environment of the dried samples. Hydrogel films, rehydrated xerogels and dry xerogels of PBI-A can also be prepared offering an ideal sample set to examine the influence of hydration on charge-separation. Using transient absorption (TA) spectroscopy, we demonstrate a correlation between water content and efficiency of generation of long-lived charge separated states within the PBI-A materials, highlighting their potential, particularly for light-driven water splitting.
引用
收藏
页码:26466 / 26476
页数:11
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