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Photoinduced Fröhlich Interaction-Driven Distinct Electron- and Hole-Polaron Behaviors in Hybrid Organic-Inorganic Perovskites by Ultrafast Terahertz Probes.
ACS Nano
January 2025
School of Information Science and Technology and Department of Optical Science and Engineering and Key Laboratory of Micro and Nano Photonic Structures (MOE), Fudan University, Shanghai 200433, China.
The formation of large polarons resulting from the Fröhlich coupling of photogenerated carriers with the polarized crystal lattice is considered crucial in shaping the outstanding optoelectronic properties in hybrid organic-inorganic perovskite crystals. Until now, the initial polaron dynamics after photoexcitation have remained elusive in the hybrid perovskite system. Here, based on the terahertz time-domain spectroscopy and optical-pump terahertz probe, we access the nature of interplay between photoexcited unbound charge carriers and optical phonons in MAPbBr within the initial 5 ps after excitation and have demonstrated the simultaneous existence of both electron- and hole-polarons, together with the photogenerated carrier dynamic process.
View Article and Find Full Text PDFBiarsenical-based fluorescent labeling of metallothioneins as a method for ultrasensitive quantification of poly-Cys targets.
Anal Chim Acta
February 2025
Department of Chemical Biology, Faculty of Biotechnology, University of Wroclaw, Joliot-Curie 14a, 50-383, Wrocław, Poland. Electronic address:
Background: Mammalian metallothioneins (MTs) play a crucial role in maintaining Zn(II) and Cu(I) homeostasis, as well as regulating the cellular redox potential. They are involved in cancer resistance to cisplatin-related drugs and the sequestration of toxic metal ions. To investigate their participation in specific physiological and pathological processes, it is imperative to develop an analytical method for measuring changes in protein concentration both in vitro and in vivo.
View Article and Find Full Text PDFProbing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy.
Environ Sci Technol
January 2025
Institute of Earth Surface Dynamics, University of Lausanne, Lausanne 1015 CH, Switzerland.
Interactions among microbes, minerals, and organic matter are key controls on carbon, nutrient, and contaminant dynamics in soils and sediments. However, probing these interactions at relevant scales and through time remains an analytical challenge due to both their complex nature and the need for tools permitting nondestructive and real-time analysis at sufficient spatial resolution. Here, we demonstrate the ability and provide analytical recommendations for the submicron-scale characterization of complex mineral-organic microstructures using optical photothermal infrared (O-PTIR) microscopy.
View Article and Find Full Text PDFSynthesis and Characterization of Thallium-Texaphyrin Nanoparticles and Their Assessment as Potential Delivery Systems for Auger Electron-Emitting Tl to Cancer Cells.
Mol Pharm
January 2025
Princess Margaret Cancer Centre, University Health Network, Toronto M5G 1L7, Canada.
Thallium-201 is an Auger electron-emitting radionuclide with significant potential for targeted molecular radiotherapy of cancer. It stands out among other Auger electron emitters by releasing approximately 37 Auger and Coster-Kronig electrons per decay, which is one of the highest numbers in its category. It has also a convenient half-life of 73 h, a stable daughter product, established production methods, and demonstrated high radiotoxicity.
View Article and Find Full Text PDFDirect observation of ultrafast cluster dynamics in supercritical carbon dioxide using X-ray Photon Correlation Spectroscopy.
Nat Commun
December 2024
Mechanical Engineering Department, Stanford University, Stanford, CA, 94305, USA.
Supercritical fluids exhibit distinct thermodynamic and transport properties, making them of particular interest for a wide range of scientific and engineering applications. These anomalous properties emerge from structural heterogeneities due to the formation of molecular clusters at conditions above the critical point. While the static behavior of these clusters and their effects on the thermodynamic response functions have been recognized, the relation between the ultrafast cluster dynamics and transport properties remains elusive.
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