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Photoluminescent Carbon Dots
In article number 2206587, Miroslav Medveď, Giorgio Zoppellaro, Radek Zbořil, Michal Otyepka, and co‐workers report on the photogeneration of long‐lived magnetic electron/hole polaron states in aspartic acid‐based carbon dots and their use in the photoproduction of hydrogen peroxide through the water oxidation reaction. The spatial anisotropy arising from the multilayer...
Photoactivation of aspartic acid‐based carbon dots (Asp‐CDs) induces the generation of spin‐separated species, including electron/hole (e−/h+) polarons and spin‐coupled triplet states, as uniquely confirmed by the light‐induced electron paramagnetic resonance spectroscopy. The relative population of the e−/h+ pairs and triplet species depends on the solvent polarity, featuring a substantial stabilization...
Inorganic electrides have been proved to be efficient hosts for incorporating transition metals, which can effectively act as active sites giving an outstanding catalytic performance. Here, it is demonstrated that a reusable and recyclable (for more than 7 times) copper‐based intermetallic electride catalyst (LaCu0.67Si1.33), in which the Cu sites activated by anionic electrons with low‐work function...
Heavy Metal Detection
In article number 2201003 by Aristides Bakandritsos, Michal Otyepka, and co‐workers, recyclable fluorescent nanographenes with high‐affinity pockets for toxic metals enable selective and highly effective decontamination of natural water and quality monitoring with sub‐nanomolar sensitivity for lead and cadmium via photoluminescence quenching or optical lateral‐flow sensors.
Access to clean water for drinking, sanitation, and irrigation is a major sustainable development goal of the United Nations. Thus, technologies for cleaning water and quality‐monitoring must become widely accessible and of low‐cost, while being effective, selective, sustainable, and eco‐friendly. To meet this challenge, hetero‐bifunctional nanographene fluorescent beacons with high‐affinity pockets...
Hybrid Materials
In article number 2104628, Demetrios D. Chronopoulos, Kolleboyina Jayaramulu, Michal Otyepka, and co‐workers review the integration of carbon nanotubes with metal–organic frameworks into hybrid materials with augmented properties, otherwise difficult to accomplish by a single class of materials. The authors map the growth, structure, synthetic strategies, properties, and specific...
Metal–organic frameworks (MOFs) materials constructed by the coordination chemistry of metal ions and organic ligands are important members of the crystalline materials family. Owing to their exceptional properties, for example, high porosity, tunable pore size, and large surface area, MOFs have been applied in several fields such as gas or liquid adsorbents, sensors, batteries, and supercapacitors...
In the present work the authors show that anodic TiO2 nanotubes (NT) show excellent harvesting properties for Pt single atoms (Pt SAs) from highly dilute Pt solutions. The tube walls of anodic nanotubes, after adequate annealing to anatase, provide ample of suitable trapping sites—that is, surface Ti3+‐Ov (Ov: oxygen vacancy) defects that are highly effective to extract and accumulate Pt in the form...
Single‐atom catalysts (SACs) have aroused great attention due to their high atom efficiency and unprecedented catalytic properties. A remaining challenge is to anchor the single atoms individually on support materials via strong interactions. Herein, single atom Co sites have been developed on functionalized graphene by taking advantage of the strong interaction between Co2+ ions and the nitrile group...
A heterogeneous catalyst is a backbone of modern sustainable green industries; and understanding the relationship between its structure and properties is the key for its advancement. Recently, many upscaling synthesis strategies for the development of a variety of respectable control atomically precise heterogeneous catalysts are reported and explored for various important applications in catalysis...
With increasing concerns for global warming, the solar‐driven photocatalytic reduction of CO2 into chemical fuels like methanol is a propitious route to enrich energy supplies, with concomitant reduction of the abundant CO2 stockpiles. Herein, a novel single atom‐confinement and a strategy are reported toward single ruthenium atoms dispersion over porous carbon nitride surface. Ruthenium single atom...
In article number 2004891, Roland A. Fischer, Kolleboyina Jayaramulu, and co‐workers present a few strategies reported for synthesizing hybrid MOFs by encapsulating various perovskite halides (hybrids denoted as MHP@MOF). The resultant hybrids show enhanced properties including synergic features such as long‐term stability under moisture, water, continuous high temperatures, and UV‐light illumination,...
Metal halide perovskites (MHPs) have excellent optoelectronic and photovoltaic applications because of their cost‐effectiveness, tunable emission, high photoluminescence quantum yields, and excellent charge carrier properties. However, the potential applications of the entire MHP family are facing a major challenge arising from its weak resistance to moisture, polar solvents, temperature, and light...
Here, a Sb‐doped SnO2 (ATO) nanorod underneath an α‐Fe2O3 nanorod sheathed with TiO2 for photoelectrochemical (PEC) water splitting is reported. The experimental results, corroborated with theoretical analysis, demonstrate that the ATO nanorod underlayer effect on the α‐Fe2O3 nanorod sheathed with TiO2 enhances the PEC water splitting performance. The growth of the well‐defined ATO nanorods is reported...
Chemically functional core/shell microtubes made of biodegradable polymers are fabricated using coaxial electrospinning. The luminal walls are chemically functionalized, allowing for regioselective chemical binding or adsorption inside the microtube. Attaching catalytic nanoparticles or enzymes to the luminal walls converts the microtubes into bubble‐propelled microrockets. Upon exposure to ultrasound,...
Solid‐state powders of CdTe quantum dots embedded in a NaCl matrix are applied as a highly sensitive probe for luminescence thermal imaging and sensing across a wide range of temperatures by A. L. Rogach and co‐workers on page 466. They show how the emission color changes over the whole spectral range from green to red as a function of temperature, and demonstrate that the luminescence originating...
Temperature‐dependent optical studies of semiconductor quantum dots (QDs) are fundamentally important for a variety of sensing and imaging applications. The steady‐state and time‐resolved photoluminescence properties of CdTe QDs in the size range from 2.3 to 3.1 nm embedded into a protective matrix of NaCl are studied as a function of temperature from 80 to 360 K. The temperature coefficient is found...
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