A5045446711- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Covalent Organic Framework Applications
- Conducting polymers and applications
- Luminescence Properties of Advanced Materials
- Gas Sensing Nanomaterials and Sensors
- Luminescence and Fluorescent Materials
- TiO2 Photocatalysis and Solar Cells
- Optical properties and cooling technologies in crystalline materials
- Copper-based nanomaterials and applications
- Nanocluster Synthesis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Electrochemical Analysis and Applications
- Supramolecular Chemistry and Complexes
- Chalcogenide Semiconductor Thin Films
- Organic and Molecular Conductors Research
- Ga2O3 and related materials
- Pigment Synthesis and Properties
- Inorganic Chemistry and Materials
- ZnO doping and properties
- Caching and Content Delivery
- Analytical Chemistry and Sensors
- Solar-Powered Water Purification Methods
Imperial College London
2021-2024
Institut Català d'Investigació Química
2024
Parc Científic de la Universitat de València
2014-2024
Centre for Process Innovation
2022
Universitat de València
2014-2020
Instituto de Física Corpuscular
2014-2019
Centro Médico Sanitas Valencia
2018
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...
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...
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
Mechanochemically synthesized stable and high performance Cs<sub>2</sub>AgBiBr<sub>6</sub>–Cu–RGO nanocomposite as a potential lead-free halide perovskite-based photocatalyst candidate for long-term application in solar fuel production.
Organic semiconductor nanoparticles (NPs) composed of an electron donor/acceptor (D/A) blend have recently emerged as efficient class hydrogen-evolution photocatalysts. It is demonstrated that using conjugated polymers functionalized with (oligo)ethylene glycol side chains in NP photocatalysts can greatly enhance their H2 -evolution efficiency compared to nonglycolated analogues. The strategy broadly applicable a range structurally diverse polymers. Transient spectroscopic studies show...
Abstract 2D polymers have emerged as one of the most promising classes organic photocatalysts for solar fuel production due to their tunability, charge‐transport properties, and robustness. They are however difficult process so there limited studies into formation heterojunction materials incorporating these components. In this work, a novel templating approach is used combine an imine‐based donor polymer acceptor formed through Knoevenagel condensation. Heterojunction shown be highly...
ZnO/BiOI heterojunction photoanode thin films were prepared by aerosol-assisted chemical vapour deposition, and the impact of growth temperature film thickness on water oxidation functionality was systematically investigated. A top ZnO layer with a 120 nm (deposited at 350 °C) 390 thick BiOI 300 found to achieve best photoelectrochemical performance heterojunction. The exhibited significant increase in activity, photocurrent 0.27 mA·cm−2 observed 1.1 VRHE (350 nm, 2.58 mW·cm−2), which is ~...
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...
This review surveyed the charge behavior in organic photocatalysis, and elucidated a correlation between molecular structure, dynamics photocatalytic performance.
Four solution-processable, linear conjugated polymers of intrinsic porosity are synthesised and tested for gas phase carbon dioxide photoreduction. The polymers' photoreduction efficiency is investigated as a function their porosity, optical properties, energy levels photoluminescence. All successfully form monoxide the main product, without addition metal co-catalysts. best performing single component polymer yields rate 66 μmol h-1 m-2, which we attribute to exhibiting macroporosity...
Abstract Photogenerating charges with long lifetimes to drive catalysis is challenging in organic semiconductors. Here, the role of a PM6 polymer overlayer on photoexcited carrier dynamics investigated Y6:PM6 bulk‐heterojunction (BHJ) photoanode undergoing ascorbic acid oxidation. With additional layer, hole lifetime increased solid state BHJ film. When electrically coupled hydrogen‐evolving platinum cathode, remarkably long‐lived polaron states are observed timescale seconds under...
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 Light‐induced water splitting (hν‐WS) for the production of hydrogen as a solar fuel is considered promising sustainable strategy replacement fossil fuels. An efficient system hν‐WS involves photoactive material that, upon shining light, capable separating and transferring charges to catalysts oxygen evolution processes. Covalent triazine‐based frameworks (CTFs) represent an interesting class 2D organic light‐absorbing materials that have recently emerged thanks their tunable...
Abstract Sensitized emission of lead halide perovskite nanoparticles (LHPNPs) can be achieved by near‐infrared (NIR) excitation nearby lanthanide‐doped upconversion (UCNPs) using a low‐cost diode laser. Here, the first preparation linear assemblies core and core–shell NPs, as well coassemblies LHPNPs UCNPs, within an open peapod‐like sulfate shell are reported. UCNPs with NaYF 4 matrix doped ytterbium thulium or erbium, inert in case core‐shell, all‐inorganic CsPbX 3 NPs (X = halide) chosen...
Abstract Organolead halide perovskites have emerged as exciting optoelectronic materials but a complete understanding of their photophysical properties is still lacking. Here, morphological series methylammonium lead bromide (MAPbBr 3 ) are studied by transient optical spectroscopies over eight orders magnitude in timescale to investigate the effect nanostructuring and surface states on charge carrier dynamics. The sample preparation route corresponding morphology changes influence position...
A novel preparation of lead halide, CH3NH3PbBr3, perovskite nanoparticle solid films from colloidal "naked" nanoparticles, that is, dispersible nanoparticles without any surfactant, is reported. The colloids are obtained by simply adding potassium ions, whose counterions both more lipophilic and less coordinating than bromide to the precursor solutions (CH3NH3Br/PbBr2 in dimethylformamide) following reprecipitation strategy. naked exhibit a low tendency aggregate solution, they effectively...
The preparation of densely-packed films from hybrid lead halide perovskite nanocrystals is not trivial. We demonstrate that nanoparticle solid with thicknesses hundreds nanometres can retain high photoluminescence and still sustain charge transport.
Abstract A flexible, highly sensitive sensor of oxygen in non‐aqueous solvents is described. It consists CdSe/ZnS nanoparticles decorated with a considerable number pyrene units, thus making the formation excimer possible. The emission and that nanoparticle are suitably separated from each other also excitation wavelength. This can be applied as ratiometric by using linear response lifetime combined excited state lifetime. nanohybrid has been assayed seven media different dielectric...
Light-induced water splitting (hv-WS) for the production of hydrogen as a solar fuel is considered promising sustainable strategy replacement fossil fuels. An efficient system hv-WS involves photoactive material that, upon shining light, capable separating and transferring charges to catalysts oxygen evolution processes. Covalent triazine-based frameworks (CTFs) represent an interesting class 2D organic light-absorbing materials that have recently emerged thanks their tunable structural,...
Abstract Metal halide perovskites are promising optoelectronic materials. Their electronic properties however rather unstable which is often assigned to ion migration. Ion migration can be readily influenced by an electric field (EF). Here, the response of photoluminescence (PL) individual MAPbX 3 (MA = CH NH , X I, Br) sub‐micrometer‐sized polycrystals EF studied. Alternating with frequency higher than 10 Hz found reversibly quench PL. It proposed that alternating when applied together...
Preparation of 1D assemblies lead halide-based nanoparticles inside a bromide polymer by concurrent formation lead(<sc>ii</sc>) oligomers and the in presence cyclohexanemethylammonium bromide.