Energy transfer within responsive pi-conjugated coassembled peptide-based nanostructures in aqueous environments

被引：60
作者：
Ardona, Herdeline Ann M. [1 ,2 ]
Tovar, John D. [1 ,2 ,3 ]
机构：
[1] Johns Hopkins Univ, Krieger Sch Arts & Sci, Dept Chem, Baltimore, MD 21218 USA
[2] Johns Hopkins Univ, Inst NanoBioTechnol, Baltimore, MD 21218 USA
[3] Johns Hopkins Univ, Whiting Sch Engn, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
来源：
CHEMICAL SCIENCE | 2015年 / 6卷 / 02期
关键词：
LIGHT-HARVESTING ANTENNAE; SUPRAMOLECULAR POLYMERS; CHARGE-TRANSPORT; HYDROGELS; POLYMERIZATION; OLIGOPEPTIDES; DERIVATIVES; ORGANOGELS; DISCOVERY; NETWORKS;
D O I：
10.1039/c4sc03122a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Steady-state and time-resolved photophysical measurements demonstrate energy transfer within pi-conjugated peptide nanostructures composed of oligo-(p-phenylenevinylene)-based donor units and quaterthiophene-based acceptor units in completely aqueous environments. These peptide-based assemblies encourage energy migration along the stacking axis, thus resulting in the quenching of donor emission peaks along with the development of new spectral features reminiscent of acceptor emission. These spectral changes were observed even at minute amounts of the acceptor (starting at 1 mol%), suggesting that exciton migration is involved in energy transport and supporting a funnel-like energy transduction mechanism. The reversibility of nanostructure formation and the associated photophysical responses under different conditions (pH, temperature) were also studied. This unique material design incorporates two different semiconducting units coassembled within peptide nanostructures and offers a new platform for the engineering of energy migration through bioelectronic materials in aqueous environments.
引用
收藏
页码：1474 / 1484
页数：11
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