| 1. |
- Concina, Isabella, et al.
(författare)
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One pot synthesis of bi-linker stabilised CdSe quantum dots
- 2010
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Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 244
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Tidskriftsartikel (refereegranskat)abstract
- In this study we exploited the classic Murray's synthesis for generating a hydrophilic CdSe quantum dot system in a single step procedure, with the aim of directly obtaining a material responding to the characteristic of polarity required in many end applications. 6-phosphonohexanoic acid was used as both ligand for generating the active monomer during the synthesis of the quantum dots and final stabiliser. Diffraction measurements identified the cubic phase of cadmium selenide. Energy dispersive spectroscopy analysis revealed non-stoichiometric quantum dots, being the Cd/Se ratio 60/40. This feature suggests a configuration in which Cd2+ ions are present on the nanocrystal surface. Diffuse reflectance infrared Fourier transform analysis was applied in order to investigate the structure of the quantum dot system: the results indicate a configuration in which the carboxylic function of 6-phosphonohexanoic acid establishes only a partial interaction with the quantum dot surface, being set in a pseudo-ester configuration. © 2010 IOP Publishing Ltd.
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| 2. |
- Gisenti, A, et al.
(författare)
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Synthesis and characterization of Ag/CeO2 nanocomposites
- 2010
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Ingår i: Materials Research Society Symposium Proceedings. - : Materials Research Society. - 9781605112343 ; , s. 323-328
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Konferensbidrag (refereegranskat)abstract
- Two Ag/CeO2 nanocomposite samples were prepared by deposition-precipitation (Ag/Ce nominal atomic ratio = 0.03 and 0.12). XPS data suggest the possible presence of traces of Ce(III). Beside Ag (0), oxidized silver species are also revealed in the Ag/CeO2 sample with lower metal content. The deposition of metal increases surface hydroxylation and carbonation. Methanol interacts molecularly and dissociatively with the samples; oxidation products are observed from low temperature and depend on Ag content. Both the samples reveal a high activity in methanol complete oxidation; traces of partial oxidation products are observed in the sample with lower Ag content
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| 3. |
- Jimenez-Cadena, G., et al.
(författare)
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Synthesis of different ZnO nanostructures by modified PVD process and potential use for dye-sensitized solar cells
- 2010
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Ingår i: Materials Chemistry and Physics. - : Elsevier BV. - 0254-0584 .- 1879-3312. ; 124:1, s. 694-698
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Tidskriftsartikel (refereegranskat)abstract
- Different ZnO nanostructures were synthesized by physical vapor deposition on glass-ITO substrates. Nanowires and nanosheets were obtained by a single step process using gold nanoparticles and gold thin films as catalyst. 3D nanoarchitectures were obtained by a two-step modified process; the morphology of these structures depends on the catalyst used for the second deposition: gold nanoparticles or zinc acetate seeds. All the nanostructures were characterized by SEM and TEM analyses, which showed the different morphology under same conditions of temperature, pressure, oxide precursor and deposition time. Dye-sensitized solar cells based on these ZnO structures were successfully assembled, using N179 as sensitizer with efficiencies between 0.1% and 0.5%. In spite of the low efficiency of the cells, a novel double PVD process is presented and its integration capability into solar cell devices has been proven. © 2010 Elsevier B.V. All rights reserved.
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| 4. |
- Vomiero, Alberto, et al.
(författare)
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Nanoscience for innovative dye sensitized solar cells
- 2010
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Ingår i: ISOPE-2010, Beijing. - Cupertino, Calif : ISOFE. - 9781880653777 ; , s. 538-541
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Konferensbidrag (refereegranskat)abstract
- Innovative nanonetwork composed of oxide nanoparticles and single-crystalline ZnO nanowires is demonstrated as efficient photoanode in excitonic solar cells. Such architecture benefits of the capability of high sensitizer loading offered by the nanoparticles and of the direct conduction path for electrons guaranteed by the single-crystal nanowires. The combination of these features leads to improved light absorption, electron photogeneration, and charge collection. Various types of nanonetwork were implemented in a dye-sensitized solar cell architecture demonstrating great enhancement of the efficiency with respect to a nanowire photoanode of the same thickness. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).
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