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Your search keyword '"Martín‐García, Beatriz"' showing total 15 results
Start Over Author "Martín‐García, Beatriz" Journal chemistry of materials
15 results on '"Martín‐García, Beatriz"'

3. Graphene-Based Electrodes in a Vanadium Redox Flow Battery Produced by Rapid Low-Pressure Combined Gas Plasma Treatments

Author

Bellani, Sebastiano, primary, Najafi, Leyla, additional, Prato, Mirko, additional, Oropesa-Nuñez, Reinier, additional, Martín-García, Beatriz, additional, Gagliani, Luca, additional, Mantero, Elisa, additional, Marasco, Luigi, additional, Bianca, Gabriele, additional, Zappia, Marilena I., additional, Demirci, Cansunur, additional, Olivotto, Silvia, additional, Mariucci, Giacomo, additional, Pellegrini, Vittorio, additional, Schiavetti, Massimo, additional, and Bonaccorso, Francesco, additional

Published
2021
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4. CdSexS1–xAlloyed Nanoplatelets with Continuously Tunable Blue-Green Emission

Author

Antanovich, Artsiom, Yang, Lan, Erwin, Steven C., Martín-García, Beatriz, Hübner, René, Steinbach, Christine, Schwarz, Dana, Gaponik, Nikolai, and Lesnyak, Vladimir

Abstract

Cadmium chalcogenide nanoplatelets (NPLs) are established as promising materials for a wide variety of optoelectronic applications due to their properties surpassing in many aspects their counterpart nanocrystals (NCs) with other shapes. Most of these features arise from strong quantum confinement in the direction of thickness which can be tuned with precision down to one monolayer. However, atomic smoothness of their basal planes and hence the ability to change the NPL thickness only in discrete steps prevent precise tuning of absorption and photoluminescence spectra unlike in the case of quantum dots. Preparation of alloyed NCs provides a potential solution to this problem, but it is complicated by the different reactivities of chalcogenide sources, which becomes even more restrictive in the case of NPLs because they are more sensitive to alterations of reaction conditions. In this work, we overcome this obstacle by employing highly reactive stearoyl sulfide and selenide as chalcogen sources, which enable straightforward variation of the NPL composition and thickness by changing the ratio of chalcogen precursors and reaction temperature, respectively. Alloyed CdSexS1–xNPLs obtained exhibit tunable absorption and photoluminescence bands covering the blue-green region from 380 to 520 nm with bright band-edge emission and quantum yields of ∼30–50% due to their relatively small lateral size enabled by a much finer control of the lateral growth.

Published
2022
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6. Octapod-Shaped CdSe Nanocrystals Hosting Pt with High Mass Activity for the Hydrogen Evolution Reaction

Author

Najafi, Leyla, primary, Bellani, Sebastiano, additional, Castelli, Andrea, additional, Arciniegas, Milena P., additional, Brescia, Rosaria, additional, Oropesa-Nuñez, Reinier, additional, Martín-García, Beatriz, additional, Serri, Michele, additional, Drago, Filippo, additional, Manna, Liberato, additional, and Bonaccorso, Francesco, additional

Published
2020
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7. Ultrathin Orthorhombic PbS Nanosheets

Author

Akkerman, Quinten A., primary, Martín-García, Beatriz, additional, Buha, Joka, additional, Almeida, Guilherme, additional, Toso, Stefano, additional, Marras, Sergio, additional, Bonaccorso, Francesco, additional, Petralanda, Urko, additional, Infante, Ivan, additional, and Manna, Liberato, additional

Published
2019
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15. Revisiting the Anion Framework Conservation in Cation Exchange Processes

Author

Meir, Noga, Martín-García, Beatriz, Moreels, Iwan, and Oron, Dan

Subjects
General Chemical Engineering, Inorganic chemistry, CORE/SHELL NANOCRYSTALS, COPPER TELLURIDE NANOCRYSTALS, 02 engineering and technology, Crystal structure, QUANTUM DOTS, 010402 general chemistry, 01 natural sciences, Ion, NANORODS, ABSORPTION, Materials Chemistry, Spectroscopy, Dopant, Chemistry, Doping, General Chemistry, 021001 nanoscience & nanotechnology, CDSE/CDS NANOCRYSTALS, 0104 chemical sciences, Quantum dot, Chemical physics, Nanorod, Absorption (chemistry), 0210 nano-technology
Abstract

We investigated the effect of cation exchange on the anionic framework of lightly doped CdSe:Te/CdS nanorods. In contrast with previously studied core/shell systems, the Te dopant, located in the center of the CdSe core, provides an extremely sensitive indicator for any structural changes of the anionic framework that may occur as a result of the cation exchange process. We first optimized the cation exchange procedure in order to retain the fluorescence properties of the CdSe:Te/CdS nanorods after exchange of Cd2+ for Cu+ and back to Cd2+. Next, using multiexciton spectroscopy, we were able to probe the magnitude of the exciton exciton repulsion interaction and use that to assess the degree of crystal structure conservation. Our findings provide a much stronger proof that the anion framework is indeed rigid, showing no evidence of significant migration of the anionic dopant.

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