The solely motif-doped Au36−xAgx(SPh-tBu)24(x = 1–8) nanoclusters: X-ray crystal structure and optical properties

Nanoscale ◽  
2016 ◽  
Vol 8 (33) ◽  
pp. 15317-15322 ◽  
Author(s):  
Jiqiang Fan ◽  
Yongbo Song ◽  
Jinsong Chai ◽  
Sha Yang ◽  
Tao Chen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
X Ray

scholarly journals Study on the Electrical, Structural, Chemical and Optical Properties of PVD Ta(N) Films Deposited with Different N2 Flow Rates

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 937
Author(s):  
Yingying Hu ◽  
Md Rasadujjaman ◽  
Yanrong Wang ◽  
Jing Zhang ◽  
Jiang Yan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Crystal Size ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
Flow Rates ◽  
X Ray ◽  
N2 Flow Rate

By reactive DC magnetron sputtering from a pure Ta target onto silicon substrates, Ta(N) films were prepared with different N2 flow rates of 0, 12, 17, 25, 38, and 58 sccm. The effects of N2 flow rate on the electrical properties, crystal structure, elemental composition, and optical properties of Ta(N) were studied. These properties were characterized by the four-probe method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE). Results show that the deposition rate decreases with an increase of N2 flows. Furthermore, as resistivity increases, the crystal size decreases, the crystal structure transitions from β-Ta to TaN(111), and finally becomes the N-rich phase Ta3N5(130, 040). Studying the optical properties, it is found that there are differences in the refractive index (n) and extinction coefficient (k) of Ta(N) with different thicknesses and different N2 flow rates, depending on the crystal size and crystal phase structure.

Two families of bis(imido) symmetrical Schiff bases: X-ray crystal structure and optical properties

2017 ◽  
Vol 1137 ◽  
pp. 681-691 ◽  
Author(s):  
Xiao-Na Ma ◽  
Xue-Jie Tan ◽  
Dian-Xiang Xing ◽  
Qi-Cheng Sui ◽  
Jian-Min Liu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Schiff Bases ◽  
X Ray

Electro-Optical Properties and X-ray Crystal Structure of a New Bisazomethine Dye

2008 ◽  
Vol 492 (1) ◽  
pp. 46/[410]-55/[419] ◽  
Author(s):  
Young-A Son ◽  
Shinya Matsumoto ◽  
Eun-Mi Han ◽  
Sheng Wang ◽  
Sung-Hoon Kim
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
X Ray

The crystal structure of horse met-myoglobin - I. General features: the arrangement of the polypeptide chains

1950 ◽  
Vol 201 (1064) ◽  
pp. 62-89 ◽  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Real Space ◽  
Monoclinic Space Group ◽  
X Ray ◽  
Vector Density ◽  
Molecular Weights ◽  
Plausible Model ◽  
Cell Dimensions ◽  
Polypeptide Chains

The preliminary results of an X-ray study of crystalline horse met-myoglobin are described. This protein crystallizes in the monoclinic space-group P2 1 with two molecules in general positions in the unit cell. The optical properties of the crystals show that the haem groups are parallel and lie approximately in the plane containing b and the internal bisector of β. a and c Patterson projections contain ridges of high vector density perpendicular to b and 15*4A apart; it is deduced that in real space the contents of the cell are arranged in pronounced layers of alternately high and low electron density, also perpendicular to b and 15*4 A apart. The b projections also exhibit rods of high vector density, 9*5 A apart and inclined at 20° to a . These rods are identified as the vector equivalents of the polypeptide chains, which thus run parallel to [20T] and 9*5 A apart. A Patterson projection along [20T] shows the rods well-resolved and in end-on view; by making certain plausible assumptions a Fourier projection has been made along the same direction. During shrinkage the cell dimensions change in such a way that the inter-chain distance alters very little; it is deduced that the molecules have flat sides parallel to (102) and that the liquid of crystallization is situated mainly on their [20T] faces. During shrinkage liquid is withdrawn and the molecules slide past one another along their flat sides. It is not possible to determine the whole shape of the molecule unequivocally; the most plausible model is a platelet built of four parallel co-planar lengths of chain each 54 A long (see figure 13). There are striking analogies between the structures of myoglobin and of horse haemoglobin. The type of chain folding seems to be the same in the two proteins, and probably the same as in a-keratin; and it may be that myoglobin has a structure analogous to that of one of the four layers of which haemoglobin is believed to be built up, the molecular weights of the two proteins being in the ratio 1:4.

scholarly journals Structure and Optical Properties of B'- Phase of Ag8SnSe6

2016 ◽  
Vol 17 (3) ◽  
pp. 346-349
Author(s):  
І.V. Semkiv
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Optical Absorption ◽  
Experimental Studies ◽  
Energy Dispersive Spectrum ◽  
Energy Dispersive ◽  
Interatomic Distances ◽  
X Ray ◽  
Good Agreement

Energy dispersive x-ray spectroscopy of lowtemperature b¢-Ag8SnSe6 crystalcarried out. Energy dispersive spectrum shows only peaks related to Ag8SnSe6. Experimental optical absorption spectrum and band gap value 0.82 eV are determined. Theoretical calculation of absorption spectrum shows good agreement with experimental studies. Modeling of crystal structure of Ag8SnSe6 argyrodite and interatomic distances calculation are carried out.

Synthesis and Fluorescence Properties of Water-Soluble L-Cysteine-Modified ZnSe:Ag Quantum Dots

2014 ◽  
Vol 1033-1034 ◽  
pp. 1172-1175
Author(s):  
Li Ping Lin ◽  
Feng Hua Huang ◽  
Pei Feng Chen
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Photoluminescence Spectrum ◽  
Water Soluble ◽  
Precipitation Method ◽  
X Ray ◽  
Surface Modifier ◽  
Co Precipitation

The water-soluble ZnSe:Ag quantum dots were synthesized in aqueous medium by chemical co-precipitation method with L-cysteine as surface modifier. The crystal structure and optical properties of the obtained ZnSe:Ag quantum dots have been characterized by X-ray power diffraction, infrared spectrum, UV-Vis absorption spectrum and photoluminescence spectrum. Results indicate that ZnSe:Ag quantum dots belong to the cubic blende structure and have good fluorescent characteristics. The L-cysteine modified on the surface of ZnSe:Ag quantum dots renders the quantum dots water-soluble, biocompatible.

The crystal-structure and optical properties of matlockite (PbFCl)

1934 ◽  
Vol 23 (146) ◽  
pp. 587-597 ◽  
Author(s):  
F. A. Bannister
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Single Crystal ◽  
British Museum ◽  
Museum Collection ◽  
X Ray ◽  
Fluorine Determination

It has recently been shown by W. Nieuwenkamp that matlockite is identical in chemical composition and crystal-structure with artificial lead fluochloride PbFC1. His conclusion is based upon powder photographs of the two substances and a fluorine determination of a specimen of matlockite from Matlock, Derbyshire. The present work was undertaken primarily to check Nieuwenkamp's interesting results. Access to an exceptionally fine suite of matlockite specimens in the British Museum collection made possible single crystal X-ray measurements, accurate optical determinations, and a new chemical analysis.

Synthesis, Crystal Structure, Luminescence, and Nonlinear Optical Properties of 2-[(E)-[[4-[2-(4-Methoxyphenyl)ethynyl]phenyl] imino]methyl]-4- [(E)-phenyldiazenyl]phenol

2020 ◽  
Vol 17 (8) ◽  
pp. 618-623
Author(s):  
Sagar Subhash Mohite ◽  
Aditya Babasaheb Patil-Deshmukh ◽  
Sanjay Shamrao Chavan
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Second Harmonic ◽  
Monoclinic Structure ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Shg Efficiency ◽  
Room Temperature Luminescence

2-((E)-((4-((4-methoxyphenyl)ethynyl)phenyl)imino)methyl-4-((E)phenyldiazenyl)phenol (1) have been synthesized and characterized. X-ray single crystal diffraction study of the compound 1 reveal a monoclinic structure. Room temperature luminescence is observed for 1 in CH2Cl2 solution due to π* → π transition. The SHG efficiency by Kurtz powder technique indicating the compound 1 displayed the second harmonic generation (SHG) property.

The synthesis, X-ray crystal structure and optical properties of novel 1-ferrocenyl-2-(3-phenyl-1H-1,2,4-triazol-5-ylthio)ethanone derivatives

2010 ◽  
Vol 76 (5) ◽  
pp. 531-536 ◽  
Author(s):  
Wei-Yong Liu ◽  
Yong-Sheng Xie ◽  
Bao-Xiang Zhao ◽  
Song Lian ◽  
Hong-Shui Lv ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
X Ray

scholarly journals Microstructure and optical properties of ZnO nanorods prepared by anodic arc plasma method

2018 ◽  
Vol 16 (1_suppl) ◽  
pp. 105-111
Author(s):  
Kan Li ◽  
Zhiqiang Wei ◽  
Xueliang Zhu ◽  
Wenhua Zhao ◽  
Xudong Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Zno Nanorods ◽  
Arc Plasma ◽  
X Ray ◽  
Plasma Method ◽  
Oxidizing Atmosphere ◽  
Hexagonal Wurtzite Crystal Structure ◽  
Wurtzite Crystal Structure ◽  
Hexagonal Wurtzite Crystal

Introduction: A one-dimensional ZnO nanostructure is a versatile and multifunctional n-type semiconductor. In this paper, ZnO nanorods were successfully prepared by the anodic arc plasma method in an oxidizing atmosphere. Methods: The composition, morphology, crystal microstructure, and optical properties of ZnO nanorods were characterized by using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and the corresponding selected-area electron diffraction (SAED), X-ray energy dispersive spectrometry (XEDS), ultraviolet-visible (UV-VIS) spectroscopy, Raman scattering spectrum (Raman), and photoluminescence spectrum (PL). Results: The experiment results show that ZnO nanorods synthesized by this method possess hexagonal wurtzite crystal structure with good crystallization, no other impurity phases are observed, the crystalline size is about 18 nm, and the lattice constant distortion occurs compared to that of bulk ZnO. The morphology of the sample is a rod-like shape, the length ranges from 100 nm to 300 nm, the average diameter is approximately 20 nm, and the aspect ratio is relatively high. The UV-VIS absorption spectrum occurs red shift, The Raman spectrum further demonstrates that the major peaks are assigned to ZnO optical vibrational modes, and the PL spectrum exhibits coexistence properties of ultraviolet (UV) and green emission. Conclusions: The results prove that ZnO nanorods with hexagonal wurtzite crystal structure were successfully prepared by the anodic arc plasma method in an oxidizing atmosphere.

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