In most reported works, the case of a ‘monomolecular’ Crenolanib purchase adlayer of porphyrin was considered. According to our previously
reported results, as-deposited gold films have a semi-crystallic nature, with several detectable crystallographic orientations. During annealing, due to a phase transition followed by atom rearrangements, the crystallographic orientation Au (111) becomes preferable . On the other hand, we deal with porphyrin layers that are sufficiently thicker than monomolecular film. So in our case, a dependence of the optical properties on mutual crystallographic orientation (coplanar or perpendicular orientation of the porphyrin), on the distance between the porphyrin and gold substrate, and/or on the shape of the gold nanoparticles is not assumed. The prepared nanostructures exhibit interesting optical properties and have a promising potential for different applications
in photonics, energy conversion, and analytical methods [45, 46]. Combination of gold islands arises, whose sizes and optical properties can be controlled by subsequent annealing . The gold with the deposited layer of porphyrin was used to enhance the resolution of optical spectroscopy. Gold-porphyrin films will found their application in light-harvesting Selleck PF-2341066 systems for photocurrent generation . These structures will also be useful in the reduction of molecular oxygen [33, 49]. Another attractive application of gold-porphyrin nanosystems lies in the preparation of multibit information storage devices . Additionally, gold electrodes modified by porphyrin BAY 73-4506 molecular weight or porphyrin-fullerene systems will be used for artificial photosynthesis [51, 52]. Moreover, self-assembled porphyrins on Au surface can serve as enantioselective sensors or biosensors [53, 54]. Conclusions The preparation of two different porphyrin/gold FAD and gold/porphyrin/gold systems is described. A slight enhancement of the luminescence intensity was found in the case of the porphyrin/Au structure. Additional luminescence enhancement was observed after sample annealing. The enhancement
is related to disintegration of the initially continuous gold film into an island-like structure and to excitation of surface plasmons. A sandwich gold/porphyrin/gold system with porphyrin intermediate layer was also studied. In this case, suppression of one of the two luminescence maxima and sufficient enhancement of the second one were observed. Acknowledgements This work was supported by the GA CR under the projects 108/11/P840 and 108/12/1168. References 1. Maier SA: Plasmonics: Fundamentals and Applications. New York: Springer; 2007:201. 2. Kelly KL, Coronado E, Zhao LL, Schatz GC: The optical properties of metal nanoparticles: the influence of size, shape, and dielectric environment. J Phys Chem B 2003, 107:668–677.CrossRef 3.