Kelvin probe and scanning tunneling microscope characterization of Langmuir–Blodgett sapphyrin films

Goletti, C.; Sgarlata, A.; Motta, Nunzio; Chiaradia, P.; Paolesse, Roberto; Angelaccio, A.; Drago, M.; Natale, Corrado Di; D’Amico, A.; Cocco, Michele; Troitsky, V.I.

doi:10.1063/1.124653

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…We have already studied LB layers by Kelvin probe (KP), scanning tunnelling microscopy (STM) [9] and reflectance anisotropy spectroscopy (RAS) [10]. By following the evolution of the optical anisotropy in dependence of the number of deposited monolayers, we have measured a sudden variation of the spectrum, that after a certain critical thickness assumes a derivative-like line shape from the previous absorption-like appearance [11].…”

Section: Originalmentioning

confidence: 99%

Optical anisotropy and gas sensing properties of ordered porphyrin films

Bussetti

Corradini

Goletti

et al. 2005

Physica Status Solidi (b)

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Ordered films of porphyrins are routinely obtained by Langmuir-Blodgett technique, with a thickness control at the level of a single monolayer. The study of their optical anisotropy by reflectance anisotropy spectroscopy (RAS) has evidenced an interesting modification of the spectral line shape around the Soret band of the porphyrin layer after a certain critical thickness has been deposited onto the substrate. This finding has been connected to a structural modification of the film, although a detailed model was lacking until now. Recently, a new theoretical study based on the local field interaction has proposed to explain the RAS spectra in terms of the orientation of the molecules in a layer, that would change from layer to layer as the system is assembled. In order to test the model, we have collected new experimental data studying the modification of the optical anisotropy during exposure of the film to a gas (ethanol), mimicking the application for gas sensing analysis. The results show that the model is adequate to describe the real system: reordering of the layer during or after growth originates the anomalous spectra

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Section: Originalmentioning

confidence: 99%

Optical anisotropy and gas sensing properties of ordered porphyrin films

Bussetti

Corradini

Goletti

et al. 2005

Physica Status Solidi (b)

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“…A simple measure of the CPD can be performed with the Kelvin probe technique. CPD variations in presence of volatile compounds were recorded in many cases on disordered [47] and ordered metalloporphyrins layers [48]. A more sophisticated transductin of CPD change has been obtained coating with metalloporphyrins film the gate of field effect transistors [49].…”

Section: Other Transducersmentioning

confidence: 99%

Metalloporphyrins based artificial olfactory receptors

Natale

Paolesse

D’Amico

2007

Sensors and Actuators B: Chemical

133

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“…In a further study of porphyrin layers on ITO with thicknesses of up to 35 nm, Moons et al suggested a model including both states at the organic/ITO interface as well as surface states of the porphyrin layer, and attributed the observed SPV of a few 100 mV to exciton creation and charge separation within the organic layer [6]. Finally, Goletti et al studied sapphyrin films on gold with a thickness of several monolayers [7]. The SPV of up to 30 mV was interpreted as an indication of a small band bending within the film.…”

Section: Introductionmentioning

confidence: 95%