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A Review on the Applications of Quantum Dots in Sample Preparation.
J Sep Sci
January 2025
Department of Ocean Science, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran.
In recent years, despite significant advances in preconcentration and preparation techniques that have led to efficient recovery and accurate measurement of target compounds. There is still a need to develop adsorbents with unique and efficient features such as high pore volume and surface area, reactivity, easy synthesis, low toxicity, and compatibility with the environment, which increase the adsorption capacity and increase extraction efficiency. Semiconductor nanocrystals called quantum dots (QDs) with a size of less than 10 nm are three-dimensional nanoparticles with a spherical, rod, or disc structure that have significant potential in extraction as adsorbents due to their excellent properties such as low toxicity, reactivity, environmental friendliness, and hydrophilic and hydrophobic interactions.
View Article and Find Full Text PDFHydrogen Sensing via Heterolytic H2 Activation at Room Temperature by Atomic Layer Deposited Ceria.
ChemSusChem
January 2025
Brandenburgische Technische Universitat Cottbus-Senftenberg, Angewandte Physik und Halbleiterspektroskopie, Konrad-Zuse-Str. 1, 03046, Cottbus, GERMANY.
Ultrathin atomic layer deposited ceria films (< 20 nm) are capable of H2 heterolytic activation at room temperature, undergoing a significant reduction regardless of the absolute pressure, as measured under in-situ conditions by near ambient pressure X-ray photoelectron spectroscopy. ALD-ceria can gradually reduce as a function of H2 concentration under H2/O2 environments, especially for diluted mixtures below 10%. At room temperature, this reduction is limited to the surface region, where the hydroxylation of the ceria surface induces a charge transfer towards the ceria matrix, reducing Ce4+ cations to Ce3+.
View Article and Find Full Text PDFStack bonding in pentacene and its derivatives.
Phys Chem Chem Phys
January 2025
Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, USA.
Understanding the nature of π-stacking interactions is important to molecular recognition, self-assembly, and organic semiconductors. The stack bond order (SBO) model of π-stacking has shown that the conformations of dimers are found at orientations where the combinations of monomer MOs are overall bonding within the stack. DFT calculations show that parallel displaced minima found on the potential energy surface for the π-stacked dimers of pentacene and perfluoropentacene occur when the dimer MOs are constructed from combinations of monomer MOs with an allowed SBO.
View Article and Find Full Text PDFRecent Advances of Macrostructural Porous Silicon for Biomedical Applications.
ACS Appl Mater Interfaces
January 2025
College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea.
Porous silicon (pSi) has gained substantial attention as a versatile material for various biomedical applications due to its unique structural and functional properties. Initially used as a semiconductor material, pSi has transitioned into a bioactive platform, enabling its use in drug delivery systems, biosensing, tissue engineering scaffolds, and implantable devices. This review explores recent advancements in macrostructural pSi, emphasizing its biocompatibility, biodegradability, high surface area, and tunable properties.
View Article and Find Full Text PDFSurface Composition Impacts Selectivity of ZnTe Photocathodes in Photoelectrochemical CO Reduction Reaction.
ACS Energy Lett
January 2025
Liquid Sunlight Alliance, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States.
Light-driven reduction of CO into chemicals using a photoelectrochemical (PEC) approach is considered as a promising way to meet the carbon neutral target. The very top surface of the photoelectrode and semiconductor/electrolyte interface plays a pivotal role in defining the performance for PEC CO reduction. However, such impact remains poorly understood.
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