Publications (41) View all
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Article: Surface doping in T6/ PDI-8CN2 Heterostructures investigated by transport and photoemission measurements
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ABSTRACT: In this paper, we discuss the surface doping in sexithiophene (T6) organic field-effect transistors by PDI-8CN2. We show that an accumulation heterojunction is formed at the interface between the organic semiconductors and that the consequent band bending in T6 caused by PDI-8CN2 deposition can be addressed as the cause of the surface doping in T6 transistors. Several evidences of this phenomenon have been furnished both by electrical transport and photoemission measurements, namely the increase in the conductivity, the shift of the threshold voltage and the shift of the T6 HOMO peak towards higher binding energies.11/2012; -
Conference Proceeding: Biocompatibility and wettability of crystalline SiC and Si surfaces
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ABSTRACT: Crystalline silicon carbide (SiC) and silicon (Si) biocompatibility was evaluated by directly culturing three mammalian cell lines on these semiconducting substrates. Cell proliferation and adhesion quality were studied using MTT [3- (4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assays and fluorescent microscopy. The reported results show that SiC is indeed a more biocompatible substrate than Si. The surface wettability of SiC and Si samples was evaluated through static contact angle measurements, which provided interesting information regarding the influence of different cleaning procedures on the SiC surfaces. The cell proliferation data are discussed in light of the contact angle measurements results. This joint analysis leads to interesting conclusions that may help to uncover the main factors that define a semiconductor's biocompatibility.Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE; 09/2007 -
Article: Biocompatibility and wettability of crystalline SiC and Si surfaces.
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ABSTRACT: Crystalline silicon carbide (SiC) and silicon (Si) biocompatibility was evaluated by directly culturing three mammalian cell lines on these semiconducting substrates. Cell proliferation and adhesion quality were studied using MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assays and fluorescent microscopy. The reported results show that SiC is indeed a more biocompatible substrate than Si. The surface wettability of SiC and Si samples was evaluated through static contact angle measurements, which provided interesting information regarding the influence of different cleaning procedures on the SiC surfaces. The cell proliferation data are discussed in light of the contact angle measurements results. This joint analysis leads to interesting conclusions that may help to uncover the main factors that define a semiconductor's biocompatibility.Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2007; 2007:5850-3. -
Article: Simultaneous detection of ammonia, methane and ethylene at 1.63 μm with diode laser photoacoustic spectroscopy
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ABSTRACT: Spectral investigation around 6115cm-1 for simultaneous detection of ammonia, methane and ethylene in gas samples is presented. Experimental data on the ν2+ν3+ν4 combination band of ammonia are reported with a resolution of 1.5GHz. A trace gas analyzer based on a resonant photoacoustic cell and an external cavity diode laser has been used for detection. A data fitting procedure has been developed in order to improve the system sensitivity and to limit the need of a reference cell. The selected spectral region allows a sensitivity of about 60ppm for ammonia, 6ppm for methane and 30ppm for ethylene with 0.3mW laser power. An application of simultaneous detection of such molecules in a mixture reproducing their typical abundances in real gas samples from biomass gasification is discussed.Applied Physics B 02/2006; 82(3):495-500. · 2.19 Impact Factor -
Article: Alignment of ethylene molecules in supersonic seeded expansions probed by infrared polarized laser absorption and by molecular beam scattering
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ABSTRACT: Relaxation and alignment of the rotational angular momentum of ethylene molecules are here shown to be induced naturally by collisions occurring in supersonic seeded expansions, which lead to generation of continuous molecular beams. Dependences of the achieved alignment degree on the rotational level, on the final molecular speed and on the divergence angle with respect to the molecular beam expansion direction have been investigated using two separate complementary experimental techniques, IR spectroscopy and molecular beam scattering. Results obtained for this planar hydrocarbon are of interest toward the goal of planning collisional alignment experiments on molecules with different mass and geometry.Chemical Physics Letters. 01/2006; 420(1-3):47-53.
