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Your search keyword '"Bittencourt, Carla"' showing total 9 results
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9 results on '"Bittencourt, Carla"'

2. Electron Beam Nanosculpting of Kirkendall Oxide Nanochannels

Author

El Mel, Abdel-Aziz, primary, Molina-Luna, Leopoldo, additional, Buffière, Marie, additional, Tessier, Pierre-Yves, additional, Du, Ke, additional, Choi, Chang-Hwan, additional, Kleebe, Hans-Joachim, additional, Konstantinidis, Stephanos, additional, Bittencourt, Carla, additional, and Snyders, Rony, additional

Published
2014
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3. Knitting the Catalytic Pattern of Artificial Photosynthesis to a Hybrid Graphene Nanotexture

Author

Quintana, Mildred, primary, López, Alejandro Montellano, additional, Rapino, Stefania, additional, Toma, Francesca Maria, additional, Iurlo, Matteo, additional, Carraro, Mauro, additional, Sartorel, Andrea, additional, Maccato, Chiara, additional, Ke, Xiaoxing, additional, Bittencourt, Carla, additional, Da Ros, Tatiana, additional, Van Tendeloo, Gustaaf, additional, Marcaccio, Massimo, additional, Paolucci, Francesco, additional, Prato, Maurizio, additional, and Bonchio, Marcella, additional

Published
2012
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7. Study of the Interface between Rhodium and Carbon Nanotubes

Author

Suarez-Martinez, Irene, primary, Ewels, Christopher P., additional, Ke, Xiaoxing, additional, Van Tendeloo, Gustaaf, additional, Thiess, Sebastian, additional, Drube, Wolfgang, additional, Felten, Alexander, additional, Pireaux, Jean-Jacques, additional, Ghijsen, Jacques, additional, and Bittencourt, Carla, additional

Published
2010
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8. Knitting the Catalytic Pattern of Artificial Photosynthesis to a Hybrid Graphene Nanotexture

Author

Quintana, Mildred, López, Alejandro Montellano, Rapino, Stefania, Toma, Francesca Maria, Iurlo, Matteo, Carraro, Mauro, Sartorel, Andrea, Maccato, Chiara, Ke, Xiaoxing, Bittencourt, Carla, Da Ros, Tatiana, Van Tendeloo, Gustaaf, Marcaccio, Massimo, Paolucci, Francesco, Prato, Maurizio, and Bonchio, Marcella

Abstract

The artificial leaf project calls for new materials enabling multielectron catalysis with minimal overpotential, high turnover frequency, and long-term stability. Is graphene a better material than carbon nanotubes to enhance water oxidation catalysis for energy applications? Here we show that functionalized graphene with a tailored distribution of polycationic, quaternized, ammonium pendants provides an sp2carbon nanoplatform to anchor a totally inorganic tetraruthenate catalyst, mimicking the oxygen evolving center of natural PSII. The resulting hybrid material displays oxygen evolution at overpotential as low as 300 mV at neutral pH with negligible loss of performance after 4 h testing. This multilayer electroactive asset enhances the turnover frequency by 1 order of magnitude with respect to the isolated catalyst, and provides a definite up-grade of the carbon nanotube material, with a similar surface functionalization. Our innovation is based on a noninvasive, synthetic protocol for graphene functionalization that goes beyond the ill-defined oxidation–reduction methods, allowing a definite control of the surface properties.

Published
2013
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9. Synthesis and characterization of boron azadipyrromethene single-wall carbon nanotube electron donor-acceptor conjugates.

Author

Flavin K, Lawrence K, Bartelmess J, Tasior M, Navio C, Bittencourt C, O'Shea DF, Guldi DM, and Giordani S

Subjects
Amides chemistry, Amines chemistry, Electron Transport, Spectrum Analysis, Temperature, Boron Compounds chemical synthesis, Boron Compounds chemistry, Nanotubes, Carbon chemistry, Porphobilinogen analogs & derivatives, Porphobilinogen chemistry
Abstract

The preparation of a novel donor-acceptor material, consisting of a red/near-infrared (NIR) absorbing boron azadipyrromethene donor covalently attached to a highly functionalized single-wall carbon nanotube (SWNT) acceptor, which bears great potential in the field of organic photovoltaics, has been demonstrated. Both purification and covalent functionalization of SWNTs have been demonstrated using a number of complementary characterization techniques, including atomic force microscopy, Raman, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared, and NIR-photoluminescence spectroscopy, and a functionalization density of approximately 1 donor molecule per 100 SWNT atoms has been estimated by XPS. The redox behavior of the fluorophore has been investigated by electrochemistry and spectroelectrochemistry as well as by pulse radiolysis. The donor-acceptor properties of the material have been characterized by means of various spectroscopic techniques, such as UV-vis NIR absorption spectroscopy, steady-state and time-resolved fluorescence spectroscopy, and time-resolved transient absorption spectroscopy. Charge transfer from the photoexcited donor to the SWNT acceptor has been confirmed with a radical ion pair state lifetime of about 1.2 ns.

Published
2011
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