Ultrathin n-Type Organic Nanoribbons with High Photoconductivity and Application in Optoelectronic Vapor Sensing of Explosives

被引:218
作者
Che, Yanke [2 ]
Yang, Xiaomei [2 ]
Liu, Guilin [1 ]
Yu, Chun [1 ]
Ji, Hongwei [1 ]
Zuo, Jianmin [3 ]
Zhao, Jincai [1 ]
Zang, Ling [2 ]
机构
[1] Chinese Acad Sci, Key Lab Photochem, Inst Chem, Beijing 100080, Peoples R China
[2] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84108 USA
[3] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA
基金
美国国家科学基金会;
关键词
PHOTOINITIATED CHARGE-TRANSPORT; ONE-DIMENSIONAL NANOSTRUCTURES; FIELD-EFFECT TRANSISTORS; PERYLENE BISIMIDE DYES; SUPRAMOLECULAR ASSEMBLIES; SINGLE-CRYSTALLINE; SELF-ORGANIZATION; ELECTRON-TRANSFER; NANOFIBRIL FILM; NANOWIRES;
D O I
10.1021/ja909797q
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Well-defined ultrathin nanoribbons have been fabricated from an amphiphilic electron donor acceptor (D-A) supramolecule comprising perylene tetracarboxylic diimide as the backbone scaffold to enforce the one-dimensional intermolecular assembly via strong a-stacking. These nanoribbons demonstrated high photoconductivity upon illumination with white light. The high photoconductivity thus obtained is likely due to the optimal molecular design that enables a good kinetic balance between the two competitive processes, the intramolecular charge recombination (between D and A) and the intermolecular charge transport along the nanoribbon. The photoconduction response has also proven to be prompt and reproducible with the light turning on and off. The photogenerated electrons within the nanoribbon can be efficiently trapped by the adsorbed oxygen molecules or other oxidizing species, leading to depletion of the charge carriers (and thus the electrical conductivity) of the nanoribbon, as typically observed for n-type semiconductor materials as applied in chemiresistors. Combination of this sensitive modulation of conductivity with the unique features intrinsic to the nanoribbon morphology (large surface area and continuous nanoporosity when deposited on a substrate to form a fibril film) enables efficient vapor sensing of nitro-based explosives.
引用
收藏
页码:5743 / 5750
页数:8
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