scholarly journals X-ray induced disulfide bond cleavage studied with EPR, optical absorption and X-ray diffraction

2013 ◽  
Vol 69 (a1) ◽  
pp. s86-s86
Author(s):  
Edward H. Snell ◽  
Kristi A. Sutton ◽  
Paul Black ◽  
Kermit R. Mercer ◽  
Elspeth F. Garman ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Disulfide Bond ◽  
Bond Cleavage ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals X-ray induced disulfide bond cleavage studied with EPR, optical absorption and X-ray diffraction

2013 ◽  
Vol 69 (a1) ◽  
pp. s405-s405
Author(s):  
Edward H. Snell ◽  
Kristin A. Sutton ◽  
Paul Black ◽  
Kermit R. Mercer ◽  
Elspeth F. Garman ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Disulfide Bond ◽  
Bond Cleavage ◽  
X Ray Diffraction ◽  
X Ray

Energy Band Gap Studies of CdS Nanomaterials

2008 ◽  
Vol 3 ◽  
pp. 97-102 ◽  
Author(s):  
Dinu Patidar ◽  
K.S. Rathore ◽  
N.S. Saxena ◽  
Kananbala Sharma ◽  
T.P. Sharma
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Energy Band ◽  
Chemical Method ◽  
Optical Absorption Spectroscopy ◽  
Cds Nanoparticles ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Simple Chemical

The CdS nanoparticles of different sizes are synthesized by a simple chemical method. Here, CdS nanoparticles are grown through the reaction of solution of different concentration of CdCl2 with H2S. X-ray diffraction pattern confirms nano nature of CdS and has been used to determine the size of particle. Optical absorption spectroscopy is used to measure the energy band gap of these nanomaterials by using Tauc relation. Energy band gap ranging between 3.12 eV to 2.47 eV have been obtained for the samples containing the nanoparticles in the range of 2.3 to 6.0 nm size. A correlation between the band gap and size of the nanoparticles is also established.

Crystallization Process and Chemical Disorder in Flash Evaporated Amorphous Gallium Antimonide Films

1993 ◽  
Vol 321 ◽  
Author(s):  
J. H. Dias Da Silva ◽  
I. Cisneros ◽  
L. P. Cardoso
Keyword(s):  
Optical Absorption ◽  
Absorption Edge ◽  
Gallium Antimonide ◽  
Crystallization Process ◽  
Optical Absorption Edge ◽  
X Ray Diffraction ◽  
Flash Evaporation ◽  
X Ray ◽  
Local Ordering ◽  
Chemical Disorder

ABSTRACTIn this work we describe a flash evaporation system specially built to produce Amorphous films of III-V compounds and characterize GaSb films using optical, electrical and X-Ray diffraction Measurements. Changes in the composition of the GaSb samples were obtained by the use of different crucible temperatures. In such samples, consequently, the optical absorption edge and the DC electrical conductivity were Modified. The departure from stoichiometry in GaSb films is analyzed on the basis of these results which can be used as an evidence of the chemical disorder. This kind of disorder is represented by either wrong bonds or sites with different coordination.Thermal annealing with a sequence of increasing temperatures first induced detectable variations in the optical absorption edge and in the vibrational properties of the Amorphous GaSb. These variations are compatible with the GaSb local ordering and were observed by Raman scattering and infrared absorption spectra. The annealing at higher temperatures allowed the crystallization of the material confirmed by X-Ray diffraction. From these experimental results a crystallization mechanism based on the segregation of Sb excess coming from the crystallized regions toward the Amorphous tissue is proposed.

Crystalline phase transformation of colloidal cadmium sulfide nanocrystals

2017 ◽  
Vol 31 (06) ◽  
pp. 1750037
Author(s):  
M. Ghali ◽  
A. M. Eissa ◽  
M. M. Mosaad
Keyword(s):  
Phase Transformation ◽  
Optical Absorption ◽  
Crystalline Phase ◽  
Growth Conditions ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
X Ray ◽  
Ph Values ◽  
Transmission Electron

In this paper, we give a microscopic view concerning influence of the growth conditions on the physical properties of nanocrystals (NCs) thin films made of CdS, prepared using chemical bath deposition CBD technique. We show a crystalline phase transformation of CdS NCs from hexagonal wurtzite (W) structure to cubic zincblende (ZB) when the growth conditions change, particularly the solution pH values. This effect was confirmed using X-ray diffraction (XRD), transmission electron microscopy (TEM), optical absorption and photoluminescence (PL) measurements. The optical absorption spectra allow calculation of the bandgap value, [Formula: see text], where significant increase [Formula: see text]200 meV in the CdS bandgap when transforming from Hexagonal to Cubic phase was found.

N–O Bond Cleavage During the Deprotonation of N,O-Bis(trimethylsilyl)hydroxylamine

2008 ◽  
Vol 63 (3) ◽  
pp. 339-341 ◽  
Author(s):  
Ajay Venugopal ◽  
Alexander Willner ◽  
Norbert W. Mitzel
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Bond Cleavage ◽  
State Structure ◽  
X Ray Diffraction ◽  
Solid State Structure ◽  
X Ray ◽  
Potassium Hydride ◽  
Oxygen Atoms

The reaction of N,O-bis(trimethylsilyl)hydroxylamine with potassium hydride in pentane affords a product of the formula {K6[OSiMe3]4[ON(SiMe3)2]2}, resulting from deprotonation followed by N-O bond cleavage and 1,2-silylshift. The compound was characterised by elemental analysis and by single crystal X-ray diffraction. The aggregate consists of a K3O3 bis-cubane core, with N(SiMe3)2 groups at the oxygen atoms shared by the two cubes, andMe3Si groups attached to the four O vertices. Two weak K···N interactions are also detected in the solid state structure.

Self-Connected Cds Nanocrystals as Precursors for Anisotropic Semiconducting Films

1994 ◽  
Vol 346 ◽  
Author(s):  
A. Chemseddine
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Band Gap ◽  
Polymeric Material ◽  
Fibrous Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Cds Films

ABSTRACTMonosized and anisotropically capped CdS nanocrystals have the property to self-connect into a polymeric material. The viscosity of this fibrous material can be adjusted to fabricate texturized and homogeneous coatings. These films can be thermally converted into pure CdS films. Based on the size dependent band gap of this semiconductor, the absorbance of the film can be fine-tuned through the size of the particle-precursor or by controlling the film heat treatment. The evolution of the film nanostructure with temperature was investigated by optical absorption, DTA, SEM and X-ray diffraction techniques.

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