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11 results on '"Pennesi, Gianna"'

3. In situ energy dispersive X-ray reflectometry to investigate the (RuPc)(sub 2)/NO(sub x) interaction process evidenced by ex situ measurements

Author

Generosi, Amanda, Rossi Albertini, Valerio, Paci, Barabara, Perfetti, Paolo, Caminiti, Ruggero, Paoletti, Anna M., Pennesi, Gianna, and Rossi, Gentilina

Subjects
Ruthenium -- Atomic properties, Phthalocyanins -- Atomic properties, Nitric oxide -- Atomic properties, Physics
Abstract

A systematic energy dispersive X-ray reflectometry study of different ruthenium phtalocyanine (RuPc)(sub 2) thin films was performed in order to investigate their reactivity with the oxidizing NO(sub x) gas. A preliminary ex situ analysis, consisting of the comparison between the morphological parameters of different films, before and after the exposure to the gas, was performed.

Published
2006

4. In situ energy dispersive x-ray reflectometry to investigate the (RuPc)2/NOx interaction process evidenced by ex situ measurements.

Author

Generosi, Amanda, Paci, Barbara, Rossi Albertini, Valerio, Perfetti, Paolo, Paoletti, Anna M., Pennesi, Gianna, Rossi, Gentilina, and Caminiti, Ruggero

Subjects
THIN films, DIFFUSION processes, X-ray spectroscopy, SOLID state electronics, SEMICONDUCTOR doping, MATERIALS testing
Abstract

A systematic energy dispersive x-ray reflectometry study of different ruthenium phthalocyanine (RuPc)2 thin films was performed in order to investigate their reactivity with the oxidizing NOx gas. A preliminary ex situ analysis, consisting of the comparison between the morphological parameters of different films (before and after the exposure to the gas), was performed. It suggests that a reaction involving two different mechanisms takes place. The following in situ (while fluxing the gas) reflectometry analysis confirms this hypothesis, and clarifies the temporal evolution, also revealing that the first mechanism is limited to the film surface, while the second is a bulk diffusion process. [ABSTRACT FROM AUTHOR]

Published
2006
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10. Enhancing the Gas-Sensing Properties of (RuPc)2Thin Films by Thermally Induced Morphological Stabilizing Effects

Author

Generosi, Amanda, Paci, Barbara, Rossi Albertini, Valerio, Generosi, Renato, Perfetti, Paolo, Maria Paoletti, Anna, Pennesi, Gianna, Rossi, Gentilina, and Caminiti, Ruggero

Abstract

We report on the use of thermal annealing to improve the behavior of NO2gas-sensing ruthenium phthalocyanine films at high temperatures. The approach used, based on the study of the effect of temperature on the film morphology, makes use of in situ energy dispersive X-ray reflectometry and atomic force microscopy. The results show that the morphological changes, induced by high working temperatures, strongly affect the material sensing ability. Furthermore, we demonstrate that the film morphology may be stabilized by thermal annealing treatments, thus enhancing the sensor performances in terms of response times and the capability to work at high temperatures.

Published
2007
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11. Real-time electrical and morphological characterizations of gas sensing Ti(Pc)2 devices under working conditions

Author

Generosi, Amanda, Paci, Barbara, Rossi Albertini, Valerio, Perfetti, Paolo, Paoletti, Anna Maria, Pennesi, Gianna, Rossi, Gentilina, and Caminiti, Ruggero

Subjects
*SOLID solutions, *THICK films, *SEMICONDUCTOR doping, *PROPERTIES of matter
Abstract

Abstract: The present study investigates the response of NO2 gas sensing devices, based on bis(phthalocyaninato)titanium thin films, by combined electrical and time-resolved energy-dispersive X-ray reflectometry (EDXR) analysis. Samples of various thicknesses were exposed to a NO2 gas flux and their electrical response was recorded, during interaction with the oxidising molecules. At the same time, the changes induced in the film thickness and roughness, produced by the “breathing like” mechanism, which characterized the diffusion of the gas in the film bulk, were monitored by EDXR. Comparing the two results, the first direct correspondence between the morphological changes and the electrical response of the sensor was found. This also demonstrates that the morphological characteristics of the films are actually related to their sensing behaviour and can therefore be used, as an alternative to the electrical response, to follow the gas–film interaction process. [Copyright &y& Elsevier]

Published
2008
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