Ultralong Copper Phthalocyanine Nanowires with New Crystal Structure and Broad Optical Absorption

Details Ultralong Copper Phthalocyanine Nanowires with New Crystal Structure and Broad Optical Absorption Ultralong Copper Phthalocyanine Nanowires with New Crystal Structure and Broad Optical Absorption

2010-12-09

arxiv.org/abs/1012.2141v1

ACS Nano, 2010, Vol:4, Pages:3921-3926

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1021/nn100782w

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 miniaturisation. In particular, nanowires have been obtained from solution or vapour 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 post-growth 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 eta-CuPc, where the molecules stack along the long axis. The resulting high electronic overlap along the centimetre 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.

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