Novel nanostructures of bromoaluminum phthalocyanine grown by physical vapor phase transport

Abstract

The growth of new nanostructured organic semiconductor materials such as metal phthalocyanines instead of polycrystalline thin films can provide the basis for the development of various revolutionary nanodevices. In this study, we report the growth of new bromo aluminum phthalocyanine (BrAlPc) nanostructures on glass substrates, namely nanorods, nanothistles, and nanocorals, by physical vapor phase transport technique. Their Surface morphology have been investigated using field emission scanning electron microscopy, suggesting the shape and the size of nanostructures is source-substrate distance dependent. Only by varying the source-substrate distance, the perpendicular, and parallel nanorods and evenly distributed nanorods without particular orientation, were observed in the surface. All the nanostructures show two absorption bands in the visible range, namely the Q-band. In addition, analyzing the absorption spectra of the grown nanostructures reveals that the BrAlPc nanothistles is in β-phase while the other nanostructures is mainly in α-phase. Because of the variety of morphologies and the ability to achieve high surface-to-volume ratios, the BrAlPc nanostructures might be of practical value in the opto-electronic devices.