Langmuir-Shäfer transfer of fullerenes and porphyrins: Formation, deposition, and application of versatile films
Thin films consisting of a fulleropyrrolidine derivative 1 and a novel water-soluble porphyrin 2 were prepared by the Langmuir-Shäfer (LS, horizontal lifting) method. In particular, a solution of 1 in chloroform and dimethyl sulfoxide was spread on the water surface, while porphyrin 2 (bearing peripheral anionic groups) was dissolved into the aqueous subphase. To the best of our knowledge, such a versatile method of film fabrication for fullerene/porphyrin mixed composite films has never been used before. Evidence of the effective interactions between the two moieties at the air-water interface was obtained from the analysis of the floating layers by means of surface pressure versus area per molecule Langmuir curves, Brewster angle microscopy and UV-visible reflection spectroscopy. The characterisation of the LS films by UV-visible spectroscopy reveals that the two constituents behave as discrete and weakly interacting π systems. The use of polarised light suggests the existence of a preferential direction of the macrocyclic rings with an edge-on arrangement with respect to the substrate surface. Finally, photoaction spectra were recorded from films deposited by only one horizontal lifting onto indium-tin-oxide (ITO) electrodes and the observed photocurrent increased notably with increasing transfer surface pressure.
Publication Source (Journal or Book title)
Chemistry - A European Journal
Conoci, S., Guldi, D., Nardis, S., Paolesse, R., Kordatos, K., Prato, M., Ricciardi, G., Vicente, M., Zilbermann, I., & Valli, L. (2004). Langmuir-Shäfer transfer of fullerenes and porphyrins: Formation, deposition, and application of versatile films. Chemistry - A European Journal, 10 (24), 6523-6530. https://doi.org/10.1002/chem.200400520