Surface morphology and optical properties of porphyrin/Au and Au/porphyrin/Au systems
1 Department of Solid State Engineering, Institute of Chemical Technology, Prague 166 28, Czech Republic
2 Institute of Chemical Process Fundamentals of the AS CR, Prague 165 02, Czech Republic
Nanoscale Research Letters 2013, 8:547 doi:10.1186/1556-276X-8-547Published: 27 December 2013
Porphyrin/Au and Au/porphyrin/Au systems were prepared by vacuum evaporation and vacuum sputtering onto glass substrate. The surface morphology of as-prepared systems and those subjected to annealing at 160°C was studied by optical microscopy, atomic force microscopy, and scanning electron microscopy techniques. Absorption and luminescence spectra of as-prepared and annealed samples were measured. Annealing leads to disintegration of the initially continuous gold layer and formation of gold nanoclusters. An amplification of Soret band magnitude was observed on the Au/meso-tetraphenyl porphyrin (TPP) system in comparison with mere TPP. Additional enhancement of luminescence was observed after the sample annealing. In the case of sandwich Au/porphyrin/Au structure, suppression of one of the two porphyrins’ luminescence maxima and sufficient enhancement of the second one were observed.