Growth and microstructure of Cd1-xZnxS films deposited by hot-wall evaporation technique

1990 ◽  
Vol 48 (4) ◽  
pp. 700-701
Author(s):  
S. Chaudhuri ◽  
A. Dhar ◽  
A.K. Pal
Keyword(s):  
Electron Microscope ◽  
Cadmium Sulphide ◽  
Zinc Sulphide ◽  
Window Layer ◽  
Transmission Electron ◽  
Zn Content ◽  
Recent Developments ◽  
Evaporation Technique ◽  
Cadmium Zinc ◽  
Substrate Source

Recent developments in the field of solar photovaltaic technology with CdS as window layer indicated that Cd1-x Znx S is more suitable as the window layer because its propeerties may be tailored by simply adjusting the Zn content. It is known that the band gap of (Cd, Zn) S increases linearly with increasing Zn in the film.We report here our studies on the growth and microstructure of thin films of cadmium zinc sulphide (Cd1-xZnxS) with the values of x in the range (0<x<0.27). Films were deposited by coevaporation of cadmium sulphide and zinc sulphide by the hot wall evaporation. Three different substrates (NaCl, KCl and LiF) were used for deposition of films in the thickness range 70 - 90 nanometer. The substrate, source and hot wall temperatures were 510 K, 1170 K and 480 K respectively.The microstructure of the films (fig. 1 ,2,3) were observed by transmission electron microscope (Hitachi H 600) and scanning electron microscope (Hitachi S-2300).

scholarly journals Green synthesis of Zinc sulphide (ZnS) nanostructures using S. frutescences plant extract for photocatalytic degradation of dyes and antibiotics

2021 ◽  
Author(s):  
Shonisani Munyai ◽  
Louisa Mahlaule Glory ◽  
Nomso Charmaine Hintsho-Mbita
Keyword(s):  
Electron Microscope ◽  
Zinc Sulphide ◽  
Gravimetric Analysis ◽  
Liquid Chromatography Mass Spectrometry ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Multifunctional Material ◽  
Degradation Of Dyes ◽  
Transmission Electron ◽  
Degradation Analysis

Abstract Pollutants such as dyes and pharmaceuticals have become a problem in the environment, thus there is a need to find multifunctional materials that are safe and can be used for the removal of various pollutants. In this study, we report on the synthesis of Zinc sulphide (ZnS) nanostructures and their use as photocatalysts for the degradation of dyes and various antibiotics. Fourier transform infrared spectroscopy(FTIR) confirmed the functional groups found in plants and these were linked to the biomolecules identified through Liquid chromatography-mass spectrometry (LCMS). Ultraviolet-visible spectroscopy (UV-vis) and X-ray diffraction (XRD) confirmed the formation of the ZnS nanostructures. Thermal Gravimetric Analysis (TGA) and Brunner Emmet Teller (BET) confirmed the material was thermally stable up until 480oC and mesoporous in nature, respectively. Scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that the material is spherical in shape and energy dispersive spectroscopy (EDS) further corroborated their formation. From the degradation analysis, 90% of the malachite green (MG) dye could be degraded in 60 min at optimum conditions (pH 6, 25 mg and 10 mg/L) and the holes were responsible for the degradation. Lastly, when tested against antibiotics, the ZnS material managed to degrade both the sulfisoxazole (SSX) and sulfamethoxazole (SMX). These results showed that the ZnS nanoparticles could be used as a multifunctional material for the degradation of various pollutants.

Gas reaction chamber for gas-solid interaction studies by high-resolution TEM

1994 ◽  
Vol 52 ◽  
pp. 494-495 ◽  
Author(s):  
Renu Sharma ◽  
Karl Weiss ◽  
Michael McKelvy ◽  
William Glaunsinger
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Cross Section ◽  
Reaction Chamber ◽  
Side View ◽  
Transmission Electron ◽  
Environmental Cell ◽  
High Resolution Tem ◽  
Recent Developments ◽  
High Resolution Images

An environmental cell (E-cell) is a gas reaction chamber mounted inside an electron microscope column where thin solid samples can be observed under various gases (O2, H2, N2, NH3 etc.) at selected temperatures. Even though the idea of having an E-cell incorporated in the microscope column is as old as transmission electron microscopy itself, recent developments in the instrumentation and designs of both the microscopes and E-cells have made it possible to obtain high resolution images (0.3-0.6 nm). We have used the differentially pumped model proposed by Swan to modify a PHILLIPS 400T transmission electron microscope for gas-solid studies.Figure la shows a side view cross section schematic of the E-cell fitted in the 9 mm gap between twin lens objective pole pieces. It consists of a small chamber with 200 and 400 μm apertures on sides a and a’ respectively. The walls are machined at the same angle as the pole pieces for an optimum fit to the conical exterior of the pole pieces and the cell is held firmly in place with o-rings (b).

Atomic Observation of the Sublimation Process of the Pb (111) Surface

2003 ◽  
Vol 10 (02n03) ◽  
pp. 455-459 ◽  
Author(s):  
T. Tanigaki ◽  
H. Suzuki ◽  
Y. Kimura ◽  
C. Kaito ◽  
Y. Saito
Keyword(s):  
Electron Microscope ◽  
Video Recording ◽  
Carbon Film ◽  
Atomic Layer ◽  
Carbon Layer ◽  
Sublimation Process ◽  
Step Flow ◽  
Transmission Electron ◽  
Evaporation Technique ◽  
Gas Evaporation Technique

The dynamic behavior of the sublimation process using ultrafine Pb particles produced by the gas evaporation technique was examined at the level of atomic resolution using a transmission electron microscope equipped with a real-time video-recording system. The ultrafine Pb particles coated with a carbon layer with a thickness of the order of 5 nm were prepared in the electron microscope by heating particles on carbon film at 300°C. Sublimation of the Pb particle covered with the carbon layer took place above 470°C, which is slightly higher than the melting point of Pb. Sublimation occurred at the surface with a higher surface energy. The sublimation process of the (111) surface was clearly observed at an atomic level. It was found that two- or four-atomic-layer step flow was observed at the (111) surface. At the (111) surface between the stacking faults, two-layer and successive one-layer sublimation occurred.

Scanning transmission electron diffraction methods

2019 ◽  
Vol 75 (4) ◽  
pp. 475-484 ◽  
Author(s):  
Alexander Stuart Eggeman
Keyword(s):  
Crystal Structure ◽  
Electron Microscope ◽  
Electron Diffraction ◽  
Data Storage ◽  
Transmission Electron Microscope ◽  
Computer Control ◽  
Secondary Phases ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Recent Developments

Scanning diffraction experiments are approaches that take advantage of many of the recent advances in technology (e.g. computer control, detectors, data storage and analysis) for the transmission electron microscope, allowing the crystal structure of materials to be studied with extremely high precision at local positions across large areas of sample. The ability to map the changing crystal structure makes such experiments a powerful tool for the study of microstructure in all its forms from grains and orientations, to secondary phases and interfaces, strain and defects. This review will introduce some of the fundamental concepts behind the breadth of the technique and showcase some of the recent developments in experiment development and applications to materials.

Deposition of cadmium sulphide and cadmium zinc sulphide thin films by photochemical deposition and their characterisation

2006 ◽  
Vol 22 (1) ◽  
pp. 73-77 ◽  
Author(s):  
M. Gunasekaran ◽  
R. Gopalakrishnan ◽  
R. Sivakumar ◽  
P. Ramasamy ◽  
M. Ichimura
Keyword(s):  
Thin Films ◽  
Cadmium Sulphide ◽  
Zinc Sulphide ◽  
Photochemical Deposition ◽  
Cadmium Zinc

scholarly journals Biosynthesis and Antimicrobial Activity of Semiconductor Nanoparticles against Oral Pathogens

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
C. Malarkodi ◽  
S. Rajeshkumar ◽  
K. Paulkumar ◽  
M. Vanaja ◽  
G. Gnanajobitha ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Blood Circulation ◽  
Cadmium Sulphide ◽  
Zinc Sulphide ◽  
X Ray Diffraction ◽  
Zns Nanoparticles ◽  
Transmission Electron ◽  
Oral Pathogens ◽  
Amine Groups ◽  
Average Size

Dental care is an essential phenomenon in human health. Oral pathogens can cause severe break which may show the way to serious issues in human disease like blood circulation and coronary disease. In the current study, we demonstrated the synthesis and antimicrobial activity of cadmium sulphide and zinc sulphide nanoparticles against oral pathogens. The process for the synthesis of cadmium sulphide (CdS) and zinc sulphide (ZnS) nanoparticles is fast, novel, and ecofriendly. Formation of cadmium sulphide (CdS) and zinc sulphide (ZnS) nanoparticles was confirmed by surface plasmon spectra using UV-Vis spectrophotometer. The morphology of crystalline phase of nanoparticles was determined from transmission electron microscopy (TEM) and X-ray diffraction (XRD) spectra. The average size of cadmium sulphide (CdS) and zinc sulphide (ZnS) nanoparticles was in the range of 10 nm to 25 nm and 65 nm, respectively, and the observed morphology was spherical. The results indicated that the proteins, which contain amine groups, played a reducing and controlling responsibility during the formation of cadmium sulphide (CdS) and zinc sulphide (ZnS) nanoparticles in the colloidal solution. The antimicrobial activity was assessed against oral pathogens such asStreptococcussp.Staphylococcussp.Lactobacillussp., andCandida albicansand these results confirmed that the sulphide nanoparticles are exhibiting good bactericidal activity.

A Reproducible Selective Stain for Cardiac Sarcoplasmic Reticulum

1974 ◽  
Vol 32 ◽  
pp. 214-215
Author(s):  
R. A. Waugh ◽  
J. R. Sommer
Keyword(s):  
Complex System ◽  
Electron Microscope ◽  
Sarcoplasmic Reticulum ◽  
Transmission Electron Microscope ◽  
Electron Microscopic ◽  
Cardiac Sarcoplasmic Reticulum ◽  
Transmission Electron

Cardiac sarcoplasmic reticulum (SR) is a complex system of intracellular tubules that, due to their small size and juxtaposition to such electron-dense structures as mitochondria and myofibrils, are often inconspicuous in conventionally prepared electron microscopic material. This study reports a method with which the SR is selectively “stained” which facilitates visualizationwith the transmission electron microscope.

Surface Structure of the Spores of Glugea Weissenbergi

1969 ◽  
Vol 27 ◽  
pp. 238-239
Author(s):  
Sanford H. Vernick ◽  
Anastasios Tousimis ◽  
Victor Sprague
Keyword(s):  
Electron Microscope ◽  
Surface Structure ◽  
Transmission Electron Microscope ◽  
Mature Spore ◽  
Spore Surface ◽  
Sectioned Material ◽  
Transmission Electron ◽  
Surface Detail

Recent electron microscope studies have greatly expanded our knowledge of the structure of the Microsporida, particularly of the developing and mature spore. Since these studies involved mainly sectioned material, they have revealed much internal detail of the spores but relatively little surface detail. This report concerns observations on the spore surface by means of the transmission electron microscope.

The High Resolution Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 316-317
Author(s):  
A. V. Crewe
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
High Vacuum ◽  
Scanning Transmission Electron Microscope ◽  
Ultra High Vacuum ◽  
Resolving Power ◽  
Imaging Characteristics ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
The Moment

The high resolution STEM is now a fact of life. I think that we have, in the last few years, demonstrated that this instrument is capable of the same resolving power as a CEM but is sufficiently different in its imaging characteristics to offer some real advantages.It seems possible to prove in a quite general way that only a field emission source can give adequate intensity for the highest resolution^ and at the moment this means operating at ultra high vacuum levels. Our experience, however, is that neither the source nor the vacuum are difficult to manage and indeed are simpler than many other systems and substantially trouble-free.

S.E.M.-T.E.M. Image Comparison

1971 ◽  
Vol 29 ◽  
pp. 132-133
Author(s):  
G. M. Greene ◽  
J. W. Sprys
Keyword(s):  
Electron Microscope ◽  
Low Carbon Steel ◽  
Secondary Emission ◽  
Low Carbon ◽  
Preparation Time ◽  
Actual Surface ◽  
Fine Detail ◽  
Transmission Electron ◽  
Transmission Study ◽  
Large Sections

The present study demonstrates that fracture surfaces appear strikingly different when observed in the transmission electron microscope by replication and in the scanning electron microscope by backscattering and secondary emission. It is important to know what form these differences take because of the limitations of each instrument. Replication is useful for study of surfaces too large for insertion into the S.E.M. and for resolution of fine detail at high magnification with the T.E.M. Scanning microscopy reduces sample preparation time and allows large sections of the actual surface to be viewed.In the present investigation various modes of the S.E.M. along with the transmission mode in the T.E.M. were used to study one area of a fatigue surface of a low carbon steel. Following transmission study of a platinum carbon replica in the T.E.M. and S.E.M. the replica was coated with a gold layer approximately 200A° in thickness to improve electron emission.

Sign in / Sign up

Export Citation Format

Share Document