A5054901218- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Photochemistry and Electron Transfer Studies
- Radical Photochemical Reactions
- Solid-state spectroscopy and crystallography
- Luminescence and Fluorescent Materials
- Luminescence Properties of Advanced Materials
- Advanced biosensing and bioanalysis techniques
- Porphyrin and Phthalocyanine Chemistry
- Free Radicals and Antioxidants
- Nanocluster Synthesis and Applications
- Organic Chemistry Cycloaddition Reactions
- X-ray Diffraction in Crystallography
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- 2D Materials and Applications
- Crystallization and Solubility Studies
- Optical properties and cooling technologies in crystalline materials
- Sulfur-Based Synthesis Techniques
- Molecular Sensors and Ion Detection
- Oxidative Organic Chemistry Reactions
- Photochromic and Fluorescence Chemistry
- TiO2 Photocatalysis and Solar Cells
Parc Científic de la Universitat de València
2016-2025
Universitat de València
2013-2023
Shanghai Jiao Tong University
2021
Instituto de Física Corpuscular
2014-2020
Centro Médico Sanitas Valencia
2018
University of Ottawa
2005-2006
Universidad Nacional de Córdoba
1998-2006
Instituto de Tecnología Química
2003-2005
Universitat Politècnica de València
2003-2005
University of Almería
2004-2005
To date, there is no example in the literature of free, nanometer-sized, organolead halide CH3NH3PbBr3 perovskites. We report here preparation 6 nm-sized nanoparticles this type by a simple and fast method based on use an ammonium bromide with medium-sized chain that keeps dispersed wide range organic solvents. These can be maintained stable solid state as well concentrated solutions for more than three months, without requiring mesoporous material. This makes it possible to prepare...
Metal-halide perovskites have rapidly emerged as one of the most promising materials 21st century, with many exciting properties and great potential for a broad range applications, from photovoltaics to optoelectronics photocatalysis. The ease which metal-halide can be synthesized in form brightly luminescent colloidal nanocrystals, well their tunable intriguing optical electronic properties, has attracted researchers different disciplines science technology. In last few years, there been...
Highly luminescent and photostable CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanoparticles have been prepared by fine-tuning the molar ratio between CH<sub>3</sub>NH<sub>3</sub>Br, PbBr<sub>2</sub>, a medium-size alkyl-chain ammonium salt, 1-octadecene.
The mechanism responsible for the extremely long photoluminescence (PL) lifetimes observed in many lead halide perovskites is still under debate. While presence of trap states widely accepted, process electron detrapping back to emissive state has been mostly ignored, especially from deep traps as these are typically associated with nonradiative recombination. Here, we study photophysics methylammonium bromide perovskite nanocrystals (PNCs) a quantum yield close unity. We show that lifetime...
The sensitization of surface-anchored organic dyes on semiconductor nanocrystals through energy transfer mechanisms has received increasing attention owing to their potential applications in photodynamic therapy, photocatalysis, and photon upconversion. Here, we investigate the visible-light excitation two nanohybrids based CsPbBr
Organometal halide perovskites (hybrid perovskites) contain an anionic metal–halogen-semiconducting framework and charge-compensating organic cations. As hybrid materials, they combine useful properties of both inorganic such as plastic mechanical good electronic mobility related to material, respectively. They are prepared from abundant low cost starting compounds. The perovskite stoichiometry is associated with the dimensionality its framework, which can vary three zero, 3D consisting...
CH3 NH3 PbBr3 perovskite nanoparticles (PAD ) are prepared with a photoluminescence quantum yield of ≈100% in air atmosphere by using the quasi-spherical shaped 2-adamantylammonium bromide (ADBr) as only capping ligand. The photostability under wet conditions this kind is enhanced cucurbit[7]uril-adamantylammonium (AD@CB) host-guest complexes
Blue-luminescent and dispersible organic–inorganic hybrid perovskites can be produced with a high reaction yield valuable optical properties, such as luminescence quantum over 20% photostability under UV light. This material assembled–disassembled reversibly.
Organic-inorganic (hybrid) and all-inorganic lead halide perovskites, in particular APbX(3) where A is an organic cation (methylammonium or formamidinium) cesium X = Cl, Br, I, respectively, are of great interest photovoltaic devices as luminescent materials for light-emitting devices. It has recently been demonstrated that they can be prepared not only nanoparticulate material by using the pores mesoporous films, but also colloidal nanoparticles, which exhibit enhanced optical properties...
A simple one-pot synthetic strategy based on the hot injection methodology was adapted to prepare (photo)stable and green emissive colloidal CsPbBr3@CsPb2Br5 core@shell heteronanocrystals (HNCs). The photoactive core, specifically CsPbBr3 ternary metal halide nanocrystals, homogeneously covered with an ultrathin CsPb2Br5 shell (ca. 2 nm), which confers them long-term stability a higher photoluminescence quantum yield. Astonishingly, this heterostructure enabled controlled exchange yield...
Highly fluorescent organogels (QD-organogel), prepared by combining a pseudopeptidic macrocycle and different types of CdSe quantum dots (QDs), have been characterized using battery optical microscopic techniques. The results indicate that the presence QDs not only does disrupt supramolecular organization internal fibrillar network organogel to significant extent, but it also decreases critical concentration gelator needed form stable thermoreversible organogels. Regarding photophysical...
Abstract Chiral quantum dots (QDs), differing in their core or shell size and, consequently, optical properties, were synthesized by the treatment of commercially available amine‐capped with methyl ester N ‐acetyl‐ L ‐cysteine (CysP). Interestingly, colloidal methanol solutions remain stable for several months. Their NMR and IR spectra accordance CysP binding to QD surface through two anchoring groups; its thiolate (strongly bound) carbonyl group (weaker group, whereas circular dichroism...
We demonstrate here the suitability of CsPbBr3 nanoparticles as photosensitizers for a demanding photoredox catalytic homo- and cross-coupling alkyl bromides at room temperature by merely using visible light an electron donor, thanks to cooperative action between nanoparticle surface organic capping.
Abstract This article delineates the state of art for several materials used in harvest, conversion, and storage energy, analyzes challenges to be overcome decade ahead them reach market benefit society. The covered have had a special interest recent years include perovskites, batteries supercapacitors, graphene, hydrogen production storage. Looking at common these different systems, scientists basic research should carefully consider commercial requirements when designing new materials....
We illustrate here the high photocatalytic activity of sustainable lead-free metal halide nanocrystals (NCs), namely, Cs3Sb2Br9 NCs, in reduction p-substituted benzyl bromides absence a cocatalyst. The electronic properties bromide substituents and substrate affinity to NC surface determine selectivity C-C homocoupling under visible light irradiation. This photocatalyst can be reused for at least three cycles preserves its good performance with turnover number ca. 105,000.
Quenching of quantum dot luminescence by nitroxides is extremely non-linear and dependent on nanoparticle size, being most effective for the smaller particles; it proposed to involve an electron exchange mechanism.
Light-driven catalytic strategies are of great interest for the synthesis useful products causing minimal environmental impact. Nature provides many examples systems working in processes activated by light, and understanding them has been and, future, will be design artificial catalysts.
Upconversion‐perovskite nanohybrids are prepared by assembling CH 3 NH PbBr perovskite nanoparticles (PK) with naked NaYF 4 :Yb 3+ ,Tm (UC n ) via an innovative strategy consisting of using cucurbit[7]uril (CB[7]) to anchor the firmly and closely upconversion nanoparticles, thus leading UC @PK CB nanohybrids. A commercial multiphoton laser scanning confocal microscope is used demonstrate successful assembly. This technique proves be useful evaluate luminescence lifetime in range several tens...
Abstract Surface chemistry and quantum confinement in nanocrystals (NCs) can modulate the energy transfer efficiency between lead halide perovskite (LHP) NCs acceptor molecules hybrid assemblies. It is demonstrated here that colloidal CsPbBr 3 capped with oleic acid/oleylamine ligand pair act as a good singlet sensitizer of meso ‐(4‐carboxyphenyl) BODIPY dye (C‐BPY). The ≈85% at 1 × 10 −6 m consistent strong binding to NC surface via carboxylate group, evidenced by nuclear magnetic resonance...
Abstract Energy transfer processes in nanohybrids are at the focal point of conceptualizing, designing, and realizing novel energy‐harvesting systems featuring nanocrystals that absorb photons their energy unidirectionally to surface‐immobilized functional dyes. Importantly, functionality these dyes defines ultimate application. Herein, CsPbBr 3 perovskite (NCs) interfaced with zinc phthalocyanine (ZnPc) carboxylic acid. The is photosensitization singlet oxygen. @ZnPc nanohybrid best our...
A variety of phenols have been obtained in aqueous media with moderate to excellent chemical yields (≤100%) by using arylboronic acids and esters as substrates, a robust CdS-TiO2 nanohybrid heterogeneous photocatalyst, visible light irradiation (467 nm), an O2-saturated atmosphere. The was prepared through linker-assisted methodology that uses mercapto alkanoic the organic linkers. showed improved photocatalytic activity hydroxylation substituted phenyl boronic compared pristine CdS quantum...
Abstract Quenching of quantum dot luminescence by nitroxides shows steep exponential behavior and is dependent on nanoparticle size, being most effective for the smaller particles. The interaction CdSe nanoparticles with TEMPO (non‐binding) 4‐amino‐TEMPO (binding) has been examined using fluorescence electron spin resonance techniques. data suggest that quenching involves an exchange mechanism. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Highly fluorescent organic- and water-soluble CdSe/ZnS core-shell quantum dots (QDs) with thiol ligands chemisorbed on the QD surface were synthesized by replacement of amine alkyl thiols under very mild conditions. The QDs exhibited an even greater photostability than initial capped QDs.