Ultralong Copper Phthalocyanine Nanowires with New Crystal Structure and Broad Optical Absorption
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- 作者：Hai Wang ; Soumaya Mauthoor ; Salahud Din ; Jules A. Gardener ; Rio Chang ; Marc Warner ; Gabriel Aeppli ; David W. McComb ; Mary P. Ryan ; Wei Wu ; Andrew J. Fisher ; Marshall Stoneham ; Sandrine Heutz
- 刊名：ACS Nano
- 出版年：2010
- 出版时间：July 27, 2010
- 年：2010
- 卷：4
- 期：7
- 页码：3921-3926
- 全文大小：413K
- 年卷期：0
- ISSN：1936-086X
文摘
The development of molecular nanostructures plays a major role in emerging organic electronic applications, as it leads to improved performance and is compatible with our increasing need for miniaturization. In particular, nanowires have been obtained from solution or vapor phase and have displayed high conductivity or large interfacial areas in solar cells. In all cases however, the crystal structure remains as in films or bulk, and the exploitation of wires requires extensive postgrowth manipulation as their orientations are random. Here we report copper phthalocyanine (CuPc) nanowires with diameters of 10−100 nm, high directionality, and unprecedented aspect ratios. We demonstrate that they adopt a new crystal phase, designated η-CuPc, where the molecules stack along the long axis. The resulting high electronic overlap along the centimeter length stacks achieved in our wires mediates antiferromagnetic couplings and broadens the optical absorption spectrum. The ability to fabricate ultralong, flexible metal phthalocyanine nanowires opens new possibilities for applications of these simple molecules.