Preparation, optical and electrical properties of PTCDA nanostructures

Abstract

Film, nanorods (NRs), nanowires (NWs), and nanoparticles (NPs) of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) were prepared by organic molecular beam deposition (OMBD) on porous anodic alumina oxide (AAO) at different substrate temperatures (T_s). Scanning electron microscopy (SEM) study showed that the morphologies of the nanostructures (NS) formed on AAO strongly depend on the T_s. The absorption spectra of different PTCDA NS present strong absorbance in the wavelength range of 400–600 nm, and the photoluminescence (PL) spectra show a blue shift as T_s increases. The current versus voltage (I–V) characteristic illustrates that the electrical conductivity of the single-crystal NW is about 3 ± 0.1 S m⁻¹, which is much higher than the conductivity of PTCDA film reported previously.