Abstract
Recently, nanotechnology has become a very important issue not only in the academic world but also in industry. In addition, organic materials are considered as a promising field in various applications. Therefore, by forming nanosized organic products, a new direction of nanoscience can be further created. In this work, 1-D nanostructures of copper phthalocyanine (CuPc) were prepared by vapor condensation. The morphologies and sizes of CuPc nanostructures were controlled by the pressure of the inert gas and the evaporation temperature and time. The growth mechanism of 1-D nanostructures was explained by dendritic growth caused by the temperature gradient. The amorphous phase of CuPc nanostructures was identified by XRD. The blue shift of B-band observed by UV-visible absorption spectra was caused by the size effect. DSC analysis showed that the phase transition temperature from α to β was approximate 533K for commercial powder. As for as-prepared nanostructures, no phase transition occurred at around 533K. In order to study the heat treatment of CuPc, thin film was also prepared by vapor condensation system in a high vacuum condition. 1-D structures were formed after heat treatment on CuPc nanostructures and thin film. Besides, the β phase was formed after annealing. The optical band gap had a red shift as the annealing temperature increased. In other words, the absorption characteristic of CuPc could be changed by the heat treatment.