scholarly journals 2D Organic–Inorganic Hybrid Perovskite Quantum Well Materials and Their Dramatical X-ray Optoelectronic Properties

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5539
Author(s):  
Huiwen Chen ◽  
Yunlong Li ◽  
Dongfeng Xue
Keyword(s):  
Quantum Wells ◽  
Generation X ◽  
Three Dimensional ◽  
Intermolecular Forces ◽  
Optoelectronic Properties ◽  
Oriented Growth ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Hybrid Perovskite ◽  
Out Of Plane

Two-dimensional organic–inorganic hybrid perovskites (2D OIHPs) have attracted extensive attention in the field of X-ray detection due to their excellent stability compared to traditional three-dimensional OIHPs and the strong optoelectronic response to X-ray along the quantum wells. In this review, the nucleation and growth process as well as intermolecular forces for controlling out-of-plane growth are summarized along with the oriented growth mechanism. The optoelectronic properties in 2D OIHP under irradiation of X-ray are also discussed. Finally, conclusions and outlook for orientation 2D OIHP quantum wells and their challenges in application of direct X-ray detection are given. This review will provide a basic understanding on the strategy of designing 2D OIHP thick films as promising X-ray photoconductors, which may inspire the development of next-generation X-ray detectors.

scholarly journals Structural elements regulating the photochromicity in a cyanobacteriochrome

2020 ◽  
Vol 117 (5) ◽  
pp. 2432-2440 ◽  
Author(s):  
Xiuling Xu ◽  
Astrid Höppner ◽  
Christian Wiebeler ◽  
Kai-Hong Zhao ◽  
Igor Schapiro ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Structural Data ◽  
Spectral Shift ◽  
Structural Elements ◽  
Systematic Analysis ◽  
X Ray ◽  
Peculiar Form ◽  
Out Of Plane ◽  
Distinct Features ◽  
Protein Environment

The three-dimensional (3D) crystal structures of the GAF3 domain of cyanobacteriochrome Slr1393 (Synechocystis PCC6803) carrying a phycocyanobilin chromophore could be solved in both 15-Z dark-adapted state, Pr, λmax = 649 nm, and 15-E photoproduct, Pg, λmax = 536 nm (resolution, 1.6 and 1.86 Å, respectively). The structural data allowed identifying the large spectral shift of the Pr-to-Pg conversion as resulting from an out-of-plane rotation of the chromophore’s peripheral rings and an outward movement of a short helix formed from a formerly unstructured loop. In addition, a third structure (2.1-Å resolution) starting from the photoproduct crystals allowed identification of elements that regulate the absorption maxima. In this peculiar form, generated during X-ray exposition, protein and chromophore conformation still resemble the photoproduct state, except for the D-ring already in 15-Z configuration and tilted out of plane akin the dark state. Due to its formation from the photoproduct, it might be considered an early conformational change initiating the parental state-recovering photocycle. The high quality and the distinct features of the three forms allowed for applying quantum-chemical calculations in the framework of multiscale modeling to rationalize the absorption maxima changes. A systematic analysis of the PCB chromophore in the presence and absence of the protein environment showed that the direct electrostatic effect is negligible on the spectral tuning. However, the protein forces the outer pyrrole rings of the chromophore to deviate from coplanarity, which is identified as the dominating factor for the color regulation.

Two novel organic–inorganic hybrid materials from tetrachloridometallate(II) salts and 4-[(E)-2-(pyridin-1-ium-2-yl)ethenyl]pyridinium

2015 ◽  
Vol 71 (1) ◽  
pp. 48-52 ◽  
Author(s):  
José J. Campos-Gaxiola ◽  
Susana P. Arredondo Rea ◽  
Ramón Corral Higuera ◽  
Herbert Höpfl ◽  
Adriana Cruz Enríquez
Keyword(s):  
Three Dimensional ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Pyridinium Cation ◽  
Hydrogen Bonding Interactions ◽  
Dimensional Network ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Two organic–inorganic hybrid compounds have been prepared by the combination of the 4-[(E)-2-(pyridin-1-ium-2-yl)ethenyl]pyridinium cation with perhalometallate anions to give 4-[(E)-2-(pyridin-1-ium-2-yl)ethenyl]pyridinium tetrachloridocobaltate(II), (C12H12N2)[CoCl4], (I), and 4-[(E)-2-(pyridin-1-ium-2-yl)ethenyl]pyridinium tetrachloridozincate(II), (C12H12N2)[ZnCl4], (II). The compounds have been structurally characterized by single-crystal X-ray diffraction analysis, showing the formation of a three-dimensional network throughX—H...ClnM−(X= C, N+;n= 1, 2;M= CoII, ZnII) hydrogen-bonding interactions and π–π stacking interactions. The title compounds were also characterized by FT–IR spectroscopy and thermogravimetric analysis (TGA).

scholarly journals Structure and Magnetization of Strontium Hexaferrite (SrFe12O19) Films Prepared by Pulsed Laser Deposition

2021 ◽  
Vol 8 ◽  
Author(s):  
M. Khojaste khoo ◽  
P. Kameli
Keyword(s):  
Pulsed Laser Deposition ◽  
Quantum Interference ◽  
Pulsed Laser ◽  
Hysteresis Loops ◽  
Laser Deposition ◽  
Strontium Hexaferrite ◽  
X Ray Diffraction ◽  
Oriented Growth ◽  
X Ray ◽  
Out Of Plane

M-type strontium hexaferrite (SrM) thin films show excellent magnetic properties and uniaxial magnetic anisotropy. We systematically investigated the magnetism of SrM films prepared by pulsed-laser deposition on different substrates [Al2O3 (11¯02), SrTiO3 (100), ZnO (0001), and LiNbO3 (0001)] at vacuum (10−4 Pa) and a substrate temperature of 800°C. Prepared films were annealed in air at a temperature of 1,000°C for 2 hours. This investigation determined the effect of annealing and different substrates on the morphology, strain, and hysteresis loops of the films. The prepared films were characterized using x-ray diffractometry, Raman spectroscopy, scanning electron microscopy, and superconducting quantum interference device (SQUID) magnetometry. X-ray diffraction analyses confirmed c-oriented growth along the out-of-plane direction in most films. We found that annealing causes enhanced crystallization in films and a significant increase in coercivity. The highest coercivity of ∼11 KOe was measured for the film deposited on the Al2O3 (11¯02) substrate.

Towards Superior X-ray Detection Performance of Two-dimensional Halide Perovskite Crystals by Adjusting Anisotropic Transport Behavior

2021 ◽  
Author(s):  
Bao Xiao ◽  
Qihao Sun ◽  
Fangbao Wang ◽  
Shiyao Wang ◽  
Binbin Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Detection Performance ◽  
Two Dimensional ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Transport Behavior ◽  
Halide Perovskites ◽  
Anisotropic Transport ◽  
Halide Perovskite ◽  
Optoelectronic Applications

Two-dimensional (2D) organic-inorganic hybrid halide perovskites have recently attracted extensive attention for electronic and optoelectronic applications due to their tunable properties and superior stability compared with their three-dimensional (3D) counterparts....

scholarly journals The structure of polyisoprenes. VI An investigation of the molecular structure of dibenzyl by X-ray analysis

1947 ◽  
Vol 188 (1013) ◽  
pp. 222-236 ◽  
Keyword(s):  
Molecular Structure ◽  
Standard Length ◽  
Three Dimensional ◽  
Intermolecular Forces ◽  
The Other ◽  
X Ray ◽  
Bond Lengths ◽  
Benzene Rings ◽  
Carbon Bonds ◽  
Atomic Parameters

The molecular structure of dibenzyl has been determined to an accuracy of about 0.01A by using extensive X-ray data in three-dimensional Fourier syntheses to refine the approximate atomic parameters originally derived by Robertson. The three formally single-carbon bonds joining the benzene rings have lengths of 1.50, 1.48 and 1.50A and make angles of 115° with each other. The departure from the standard length of 1.54A is discussed in relation to the analogous systems of polyisoprenes and 1.5 dienes where related effects have been observed. The dimensions of the benzene rings also reflect the unusual character of the acyclic carbon bonds, two of the aromatic bond lengths being 1.39A and the other four 1.37A. The molecule, although possessing a centre of symmetry, is not absolutely symmetrical, since the central CH 2 — CH 2 bond is inclined at 70.5° to the plane of the benzene rings. This is ascribed to the influence of intermolecular forces.

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