scholarly journals Morphology Manipulation and Related Properties of High Crystalline Bi2S3 Nanorods by Reflux Approach

2018 ◽  
Vol 4 (5) ◽  
pp. 524-526
Author(s):  
J. Arumugam ◽  
A. Dhayal Raj ◽  
A. Albert Irudayaraj
Keyword(s):  
High Resolution ◽  
Critical Role ◽  
Precursor Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Increase With Increase ◽  
Crystallite Sizes ◽  
Ftir Spectrometer ◽  
Diffraction Patterns ◽  
Transmission Microscope

One dimensional Bi2S3 nanorods have been successfully synthesized by a very simple reflux method with different precursor concentration for 2 hours at 180 �C. The as-synthesized Bi2S3 powders were characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HRSEM), high resolution transmission microscope (HRTEM), UV-Vis spectrometer, Fourier transform infrared (FTIR) spectrometer. X-ray diffraction (XRD) results show that the resulting nanocrystals have an orthorhombic structure. X-ray diffraction patterns indicate a polycrystalline nature and the crystallite sizes seem increase with increase in the concentration. The HRSEM and HRTEM images reveal that the diameter of the nanorods increase with increasing concentration of the precursor. Morphological analysis reveals that the as-prepared Bi2S3 nanorods can be tuned to morphology by varying precursor concentration from 0.01 M to 0.001 M. The bismuth nitrate, which is known to be a linear polymer, plays a critical role as a precursor and a template for the growth of uniform Bi2S3 nanorods. Bi2S3 nanorods are good absorbents of solar radiation and hence can be used in solar cells.

scholarly journals High-speed classification of coherent X-ray diffraction patterns on the K computer for high-resolution single biomolecule imaging

2013 ◽  
Vol 20 (6) ◽  
pp. 899-904 ◽  
Author(s):  
Atsushi Tokuhisa ◽  
Junya Arai ◽  
Yasumasa Joti ◽  
Yoshiyuki Ohno ◽  
Toyohisa Kameyama ◽  
...  
Keyword(s):  
High Resolution ◽  
High Speed ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Resolution Single

The Effect of Pb on the Interface Structure of Fe/Cr(100) Metallic Multilayers

2000 ◽  
Vol 648 ◽  
Author(s):  
Kyu-Young Kim ◽  
Masao Kamiko ◽  
Sang-Mun Oh ◽  
Guang-Hong Lu ◽  
Ryoichi Yamamoto
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Interface Structure ◽  
Metallic Multilayers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Interface Structures

AbstractWe investigated the differences in the interface structures and magnetotransport properties between surfactant-mediated multilayers and normal ones. From the observations of RHEED and High-Resolution X-ray diffraction patterns, we confirmed that the surfaces of Fe/Cr(100) multilayers with Pb are flatter and the interfaces are sharper than one without Pb, which means that Pb operates as an effective surfactant. The magnetoresistance(MR) ratio of the multilayers prepared with Pb was larger than that of the multilayers prepared without Pb. The change of resistance with magnetic field was larger for the multilayers with a surfactant.

scholarly journals Synthesis of Platinum Nanoparticles from K2PtCl4 Solution Using Bacterial Cellulose Matrix

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
H. F. Aritonang ◽  
D. Onggo ◽  
C. Ciptati ◽  
C. L. Radiman
Keyword(s):  
Bacterial Cellulose ◽  
Pt Nanoparticles ◽  
Precursor Solution ◽  
Hydrogen Gas ◽  
Precursor Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Potassium Tetrachloroplatinate ◽  
Diffraction Patterns ◽  
Tga Analysis

Platinum (Pt) nanoparticles have been synthesized from a precursor solution of potassium tetrachloroplatinate (K2PtCl4) using a matrix of bacterial cellulose (BC). The formation of Pt nanoparticles occurs at the surface and the inside of the BC membrane by reducing the precursor solution with a hydrogen gas reductant. The Pt nanoparticles obtained from the variations of precursor concentration, between 3 mM and 30 mM, and the formation of Pt nanoparticles have been studied using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetry analysis (TGA). Based on X-ray diffraction patterns, Pt particles have sizes between 6.3 nm and 9.3 nm, and the Pt particle size increases with an increase in precursor concentration. The morphology of the Pt nanoparticles was observed by SEM-EDS and the content of Pt particles inside the membrane is higher than that on the surface of BC membranes. This analysis corresponds to the TGA analysis, but the TGA analysis is more representative in how it describes the content of Pt particles in the BC membrane.

The Formation of New Periodicities after N-Implantation in 4H- and 6H-SiC Samples

2013 ◽  
Vol 740-742 ◽  
pp. 447-450
Author(s):  
Konstantinos Zekentes ◽  
Katerina Tsagaraki ◽  
Aikaterini Breza ◽  
Nikolaos Frangis
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Periodic Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Nitrogen Ions ◽  
Diffraction Patterns ◽  
Post Implantation

The purpose of the present study is to study the crystal periodicities that appear in 4H- and 6H-SiC material after the implantation with nitrogen and prior to post-implantation annealing. High Resolution X-Ray diffraction (HRXRD) and Transmission Electron Microscopy (TEM) have been employed towards this purpose. Extra peaks at smaller, than the main (00n) peak, diffraction angles in HRXRD scans and extra spots in the electron diffraction patterns have been observed due to the presence of these periodicities. Higher lattice constant periodic structures are apparently formed from the implanted nitrogen ions located at interstitial sites and disappear after the annealing and the resulting positioning of nitrogen atoms in substitutional sites.

PREPARATION AND HOMOGENEITY OF LANTHANIDE-DOPED CERIA NANOCRYSTAL DISPERSIONS

2000 ◽  
Vol 14 (03) ◽  
pp. 79-88 ◽  
Author(s):  
A. HARTRIDGE ◽  
A. K. BHATTACHARYA
Keyword(s):  
High Resolution ◽  
Anion Vacancy ◽  
Dark Field ◽  
Correlation Spectroscopy ◽  
Inorganic Materials ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Large Area ◽  
X Ray ◽  
Crystallite Sizes

Aqueous sols of solid solutions of the general formula Ce 1-x Ln x O 2-x/2□x/2 (Ln=entire lanthanide range, x = 0–0.50 and =anion vacancy) were synthesized using inorganic materials. The sols contained single-phase nanocrystals with particle sizes between 7–20 nm from photon correlation spectroscopy and crystallite sizes around 5 nm from X-ray diffraction. The nanocrystals were dispersed on an amorphous silica support and individual crystals examined for composition and structure by high-resolution TEM/EDAX. High-resolution pictures showed the nanocrystals to be between 4–6 nm in size, in agreement with X-ray diffraction results. Conical dark field and bright field pictures of the same area highlighted nanocrystals to be analyzed and microdiffraction of these crystals showed spot patterns of various individual planes of the fcc fluorite lattice giving lattice parameters, depending on dopant, between 5.6–5.9 Å. EDAX analysis of individual crystals compared closely to each other, to that of an average over a large area and to that of the nominal composition.

Identification of a new trace 114R SiC by HREM

1999 ◽  
Vol 55 (2) ◽  
pp. 255-257 ◽  
Author(s):  
X. Y. Yang ◽  
G. Y. Shi ◽  
X. M. Meng ◽  
H. L. Huang ◽  
Y. K. Wu
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Matrix Model ◽  
High Resolution Electron Microscopy ◽  
Stacking Sequence ◽  
X Ray Diffraction ◽  
X Ray ◽  
Resolution Electron ◽  
Diffraction Patterns

Using electron diffraction patterns and high-resolution electron microscopy (HREM), a trace 114R SiC in commercial α-SiC powder (mainly 6H SiC according to X-ray diffraction) has been discovered. In a hexagonal unit cell its stacking sequence is [(33)4(34)2]3, the periodicity along the c axis is 286.14 Å and a = b = 3.073 Å. 114R belongs to the structure series of (33) n34(33) m34 predicted theoretically by Pandey & Krishna [Mater. Sci. Eng. (1975), 20, 243–249] on the basis of the faulted matrix model.

Evaluation of Freezing Methods by Low Temperature X-Ray Diffraction

1977 ◽  
Vol 35 ◽  
pp. 330-333
Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello
Keyword(s):  
Biological Materials ◽  
Molecular Organization ◽  
X Ray Diffraction ◽  
Glass Capillary ◽  
X Ray ◽  
Rate Dependent ◽  
Before And After ◽  
Freeze Etching ◽  
Diffraction Patterns ◽  
Set Up

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

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