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The Impact of Silver Codoping on Tb Luminescence in Lithium Tetraborate Glasses.
Luminescence
January 2025
Vlokh Institute of Physical Optics, Ivan Franko National University of Lviv, Lviv, Ukraine.
Spectroscopic properties of Tb-doped and Tb-Ag codoped lithium tetraborate (LTB) glasses with LiBO (or LiO-2BO) composition are investigated and analysed using electron paramagnetic resonance (EPR), optical absorption, photoluminescence (PL) and photoluminescence excitation (PLE) spectra, PL decay kinetics and absolute quantum yield (QY) measurements. PL spectra of the investigated glasses show numerous narrow emission bands corresponding to the D → F (J = 6-0) and D → F (J = 5-3) transitions of Tb (4f) ions. The most intense PL band of Tb ions at 541 nm (D → F transition) is characterised by a lifetime slightly exceeding 2.
View Article and Find Full Text PDFA Spectrochemical Series for Electron Spin Relaxation.
J Am Chem Soc
January 2025
Division of Chemistry and Chemical Engineering, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.
Controlling the rate of electron spin relaxation in paramagnetic molecules is essential for contemporary applications in molecular magnetism and quantum information science. However, the physical mechanisms of spin relaxation remain incompletely understood, and new spectroscopic observables play an important role in evaluating spin dynamics mechanisms and structure-property relationships. Here, we use cryogenic magnetic circular dichroism (MCD) spectroscopy and pulse electron paramagnetic resonance (EPR) in tandem to examine the impact of ligand field (d-d) excited states on spin relaxation rates.
View Article and Find Full Text PDFLiquid-crystal-imprinted synthesis of chiral polypyrroles without a chiral centre using a two-step method of spark-discharge oligomerisation-electrochemical polymerisation.
Nanoscale
January 2025
Department of Materials Science, Institute of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan.
Pyrrole in a cholesteric liquid crystal was discharged using a Tesla coil to generate pyrrole radicals, affording linear-shaped nano-ordered pyrrole oligomers. Subsequently, the electrochemical polymerisation of a pre-oriented pyrrole oligomer having good affinity for liquid crystals was performed to achieve polypyrrole-imprinted asymmetry from the cholesteric liquid crystal structure. The resultant polymers were analysed using polarising optical microscopy observations, scanning electron microscopy, electrochemistry, optical spectroscopy, and electron spin resonance.
View Article and Find Full Text PDFSynthesis and characterization of allomelanin model from 1,8-dihydroxynaphthalene autooxidation.
Sci Rep
January 2025
Faculty of Biochemistry, Biophysics and Biotechnology, Department of Plant Physiology and Biochemistry, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland.
In this work a novel method for synthesis of 1,8-dihydroxynaphthalene melanin was presented, as well as the physicochemical properties, molecular structure, and characteristics of the pigment. The proposed synthesis protocol is simple and cost-effective with no enzymes or catalysts needed. The final product is not adsorbed on any surface, since the pigment is the result of autooxidation of 1,8-dihydroxynaphthalene.
View Article and Find Full Text PDFMechanism of oxygen vacancy engineering CoO/FeO regulated electrocatalytic reduction of nitrate to ammonia.
J Colloid Interface Sci
December 2024
College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, PR China; Key Laboratory for Rural Ecosystem Health in the Dongting Lake Area of Hunan Province, Changsha 410128, PR China; Yuelushan Laboratory, Hongqi Road, Changsha, Hunan 410128, PR China. Electronic address:
To enhance the activity of the nitrate reduction reaction (NORR), the development of oxygen vacancies electrocatalysts is a promising approach for improving the efficiency of ammonia synthesis. However, the mechanism by which oxygen vacancies regulate NORR to ammonia remains poorly understood. In this study, a series of CoO/FeO composite catalysts derived from ZIF-67 containing oxygen vacancies (OVs) were synthesized to elucidate the role of OVs on the activity and selectivity of ammonia synthesis.
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