A5042117533- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Radioactive element chemistry and processing
- Crystal Structures and Properties
- Nuclear materials and radiation effects
- Perovskite Materials and Applications
- Crystallography and molecular interactions
- Inorganic Fluorides and Related Compounds
- Nuclear Materials and Properties
- Solid-state spectroscopy and crystallography
- Chemical Synthesis and Characterization
- Inorganic Chemistry and Materials
- Luminescence Properties of Advanced Materials
- Advanced Condensed Matter Physics
- Lanthanide and Transition Metal Complexes
- Chemical Thermodynamics and Molecular Structure
- 2D Materials and Applications
- Radioactive contamination and transfer
- Crystal structures of chemical compounds
- Optical properties and cooling technologies in crystalline materials
- Advanced Semiconductor Detectors and Materials
- Radiation Detection and Scintillator Technologies
- Chalcogenide Semiconductor Thin Films
- Metal-Organic Frameworks: Synthesis and Applications
- Zeolite Catalysis and Synthesis
University of South Carolina
2018-2024
Northwestern University
2021-2024
University of Georgia
2023-2024
University of South Carolina Sumter
2018-2022
Samara National Research University
2011-2020
Forschungszentrum Jülich
2014-2018
Stadtwerke Jülich (Germany)
2016
Solution-processed perovskites are promising for hard X-ray and gamma-ray detection, but there limited reports on their performance under extremely intense X-rays. Here, a solution-grown all-inorganic perovskite CsPbBr3 single-crystal semiconductor detector capable of operating at ultrahigh flux 1010 photons s-1 mm-2 is reported. High-quality single crystals fabricated into detectors with Schottky diode structure eutectic gallium indium/CsPbBr3 /Au. A high reverse-bias voltage 1000 V (435...
Abstract Spectroscopic‐grade single crystal detectors can register the energies of individual X‐ray interactions enabling photon‐counting systems with superior resolution over traditional photoconductive detection systems. Current technical challenges have limited preparation perovskite semiconductors for energy‐discrimination detection. Here, this work reports deployment a spectroscopic‐grade CsPbBr 3 Schottky detector under reverse bias continuum hard in both photocurrent and spectroscopic...
Abstract Covalency in actinides has emerged as a resounding research topic on account of the technological importance separating minor from lanthanides for spent nuclear fuel processing, and utilization their distinct bonding properties been realized route towards overcoming this challenge. Because limited radial extent 4f orbitals, there is almost no electron participation lanthanides; not case actinides, which have extended 5f orbitals that are capable overlapping with ligand although to...
Halide perovskites doped with magnetic impurities (such as the transition metals Mn2+, Co2+, Ni2+) are being explored for a wide range of applications beyond photovoltaics, such spintronic devices, stable light-emitting diodes, single-photon emitters, and magneto-optical devices. However, despite several recent studies, there is no consensus on whether ions will predominantly replace octahedral B-site metal via substitution or reside at interstitial defect sites. Here, by performing...
The nature of the organic cation in two-dimensional (2D) hybrid lead iodide perovskites tailors structural and technological features resultant material. Herein, we present three new homologous series (100) with cations allylammonium (AA) containing an unsaturated C═C group iodopropylammonium (IdPA) iodine on chain: (AA)2MAn-1PbnI3n+1 (n = 3-4), [(AA)x(IdPA)1-x]2MAn-1PbnI3n+1 1-4), (IdPA)2MAn-1PbnI3n+1 as well their perovskite-related substructures. We report situ transformation AA layers...
Abstract Semiconductors for detecting hard radiation are confronted with considerable problems when operating at high photon fluxes. A perovskite CsPbBr 3 single‐crystal detector capable of X‐ray fluxes up to 10 photons s −1 mm −2 beam area ≤ 0.25 2 58.61 keV current‐mode detection is reported. The spectrometer‐grade melt‐grown detectors show a gamma‐ray energy resolution ~7.5% 122 57 Co and dark current as low 4.3 nA (0.5 ) reverse bias voltage 200 V (118 ). tested energies 8.2, 10,...
The perovskite compound CsPbBr3 has recently been discovered as a promising room-temperature semiconductor radiation detector, offering an inexpensive and easy-to-manufacture alternative to the current benchmark material Cd1-x Znx Te (CZT). performance of sensors is evaluated under harsh conditions, such high doses often found in industrial settings extreme space. Results show minimal degradation detector after exposure 1 Mrad Co-60 gamma radiation, with no significant change energy...
This frontier article focuses on the use of flux crystal growth for preparation new actinide containing materials, reviews history uranium phases, and highlights recent advances in field. Specifically, we discuss how developments f-element fueled by accelerated materials discovery via growth, have led to synthesis characterization families complex oxides, namely alkali/alkaline uranates, oxychlorides, oxychalcogenides, tellurites, molybdates, tungstates, chromates, phosphates, arsenates,...
X-ray photon-counting detectors capable of resolving the energies single photons are critical in medical imaging, and a high count rate is essential for detectors. Here, we report performance perovskite CsPbBr3 single-crystal semiconductor detector photon counting. The noise floor, energy response linearity, resolution, rate, polarization were evaluated. By fine-tuning working conditions, our with planar electrode can an incident ~0.099 ~0.336 Mcps/pixel at 10% 30% deadtime loss,...
Making semiconductor radiation detectors that work at room temperature relies heavily on the deposition and pixelation of electrodes. Electrode patterning perovskite solar cells widely implements laser scribing techniques, which is a convenient, scalable, inexpensive technique. However, this method has not found its application in detector yet, question whether can achieve high-quality patterns with minimum damage to crystal low interpixel cross-talk remains largely unanswered. To prove...
Hospital-acquired infections are considered a priority for public health systems, which poses significant burden society. High-touch surfaces of healthcare centers, including textiles, provide suitable environment pathogenic bacteria to grow, necessitating incorporating effective antibacterial agents into textiles. This paper introduces highly durable gel-like solution, Silver Shell finish, contains chitosan-bound silver chloride microparticles. The study investigates the coating's...
One of the primary methods for band gap tuning in metal halide perovskites has been (I/Br) mixing. Despite widespread usage this type chemical substitution perovskite photovoltaics, there is still little understanding structural impacts alloying, with assumption being formation ideal solid solutions. The FASnI3-xBrx (x = 0-3) family compounds provides first example where breaks down, as composition space broken into two unique regimes 0-2.9; x 2.9-3) based on their average structure former...
HfCuSi2-type pnictogen compounds have recently been shown to be a versatile platform for designing materials with topologically nontrivial band structures. However, these phases require strict control over the electron count tune Fermi level, which can only achieved in compositions A2+M2+Pn2 and A3+M+Pn2 (A = lanthanides, M transition metals, Pn pnictogens P-Bi) charge distribution. While such lanthanide thoroughly studied as candidate magnetic topological materials, their heavy element...
Twenty new alkali rare earth thiosilicates and thiogermanates with the general formula ALnTS4 (A = metal, Ln lanthanide, T Si, Ge) were grown as X-ray diffraction-quality single crystals from molten chloride fluxes. These include KNdSiS4, KPrSiS4, RbLnSiS4 (Ln Ce, Pr, Nd, Gd, Tb, Dy, Ho), RbLaGeS4, CsLnSiS4 La, Nd), CsLnGeS4 (La, Eu, Tb). Herein, we discuss use of a flux growth approach for preparation title compounds their structure determination via single-crystal diffraction. In addition,...
White-light broadband emission in the visible range from low-dimensional halide perovskites is commonly attributed to structural distortions lead bromide octahedra. In this paper, we report Dion–Jacobson-phase two-dimensional (2D) based on short aromatic diammonium cations, p-phenylene (pPDA), m-phenylene (mPDA), and two 1D compounds templated by o-phenylene (oPDA). All of exhibit white-light emission. Single-crystal X-ray diffraction analysis reveals that distortion Pb octahedra influenced...
A stable aluminum tris(dithiolene) triradical (3) was experimentally realized through a low-temperature reaction of the sterically demanding lithium dithiolene radical (2) with iodide. Compound 3 characterized by single-crystal X-ray diffraction, UV–vis and EPR spectroscopy, SQUID magnetometry, theoretical computations. The quartet ground state has been unambiguously confirmed variable-temperature continuous wave experiments magnetometry. Both magnetometry broken-symmetry DFT computations...
Crystals of two acetate complexes, Cs2{Sr[UO2L3]4} (1) and [Sr(H2O)6][UO2L3]2{Sr(H2O)4[UO2L3]2}2 (2), one n-butyrate complex, {Sr(H2O)4[UO2L3]2}·2H2O (3), uranium(VI), where L is a corresponding monocarboxylate ion, were studied by means FTIR spectroscopy single crystal X-ray analysis. The structure 1 contains pentanuclear anionic {Sr[UO2L3]4}2−, bonded in three dimensional framework electrostatic interactions with Cs+ cations. 2, addition to 'typical' uranyl triacetate complexes [UO2L3]−...
A series of new U(IV) and Th(IV) fluorides, Na7U6F31 (1), NaUF5 (2), NaU2F9 (3), KTh2F9 (4), NaTh2F9 (5), (H3O)Th3F13 (6), (H3O)U3F13 (7), was obtained using hydrothermal low-temperature flux methods. Mild reactions with uranyl acetate as a precursor yielded 1, 7, the monoclinic polymorph NaU2F9, whereas direct between UF4 NaF led to formation 2 orthorhombic (3). This highlights an unexpected difference in reaction products when different starting uranium sources are used. All seven...
The synthesis of four non-Löwenstein uranyl aluminophosphates, [Cs13Cl5][(UO2)3Al2O(PO4)6], Rb7[Al2O(PO4)3][(UO2)6O4(PO4)2], Cs3[Al2O(PO4)3][(UO2)3O2], and Rb3[Al2O(PO4)3][(UO2)3O2], the first phosphate salt-inclusion material [Cs4Cs4Cl][(UO2)4(PO4)5], a related structure Cs4[UO2Al2(PO4)4], all prepared by molten flux methods, is reported. All compounds are discussed from point view their structural features favoring, in some cases, ion-exchange properties. Löwenstein's rule, well known...
To determine the influence of lanthanide size on structures and properties thiophosphates, a thiophosphate series containing different lanthanides was synthesized via high temperature flux crystal growth their physical analyzed compared. Layered thiohypophosphates NaLnP2S6 (Ln = La, Ce, Pr) thiopyrophosphates CsLnP2S7 Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb, Y) were grown out an iodide using consistent reaction conditions across both series. Under mildly reducing conditions, rather rare example...
Actinide chalcogenides are of interest for fundamental studies the behavior 5f electrons in actinides located a soft ligand coordination environment. As exhibit an extremely high affinity oxygen, synthesis phase-pure actinide chalcogenide materials free oxide impurities is great challenge and, moreover, requires availability and use oxygen-free starting materials. Herein, we report new method, boron–chalcogen mixture (BCM) uranium based on mixture, where boron functions as "oxygen sponge" to...