scholarly journals Structural, Optical, Electrical and Photocatalytic Degradation Properties of Cadmium Sulfide Nanopaticles by Sol Gel Methodd

2020 ◽  
Vol 32 (9) ◽  
pp. 2347-2355
Author(s):  
M. SANKAR ◽  
M. JOTHIBAS ◽  
A. MUTHUVEL ◽  
B. ARUN KUMAR
Keyword(s):  
Electron Microscopy ◽  
Cadmium Sulfide ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Cds Nanoparticles ◽  
Potential Candidate ◽  
Morphological Transformation ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Uv Visible

Cadmium sulfide (CdS) nanoparticles were synthesized via inexpensive sol gel method at different sintering temperature (350, 400 and 450 °C). The synthesized CdS nanoparticles have been characterized by X-ray diffraction, UV-visible spectroscopy, photoluminescence spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy and Fourier transform infrared spectroscopy. The XRD pattern confirmed the formation of hexagonal Wurtzite structure for all the sintering temperatures. The crystallite size, microstrain and dislocation density have been evaluated using XRD data. SEM and HR-TEM analysis showed morphological transformation with better crystallite and spherical shaped CdS nanoparticles were observed. EDS is also performed to confirm the elemental composition of CdS nanoparticles. FT-IR analysis identified the absorption peaks of the Cd-S extension with moisture content. The UV-visible spectra showed absorption peak in the range of 223-257 nm and optical band gap decrease with increase of sintering temperatures. In addition the synthesized CdS nanoparticles were effectively used to degrade methyl orange dye under sunlight irradiation. The CdS nanoparticles were the potential candidate for optoelectronic applications.

Silver Doped Nano-Sized Bioglass Ceramics: Synthesis, Characterization and Biocompatibility Studies

2016 ◽  
Vol 860 ◽  
pp. 25-28 ◽  
Author(s):  
Chinnasamy Ramaraj Mariappan ◽  
Narender Ranga
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
Bending Vibrations ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Calcium Phosphosilicate ◽  
Uv Visible

We report on the structural and biocompatibility properties of nanosized calcium phosphosilicate bioglass ceramics doped with 0, 2, 4 and 6 mol% Ag2O. Silver doped bioceramics were synthesized by sol-gel method. The prepared samples were characterized by means of powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-visible and high resolution transmission electron microscopy. The XRD reveals the glass-ceramic nature of the samples. The FT-IR spectra show the possible stretching and bending vibrations of silicate and phosphate groups. Absorptions in UV-visible spectra reveal the silver embedment as Ag+/Ago form into the glass matrix. nanosize of the glass ceramics is confirmed by HR-TEM analysis. The bioactivity of silver doped bioceramics was investigated by in-vitro method with Dulbecco’s Modified Eagel’s Medium. It confirms the formation of bone-like hydroxylapatite layer formation on the surface of bioceramics.

Functionalized Silicate Supported TiO2-ZnO Nanocomposite Film and its Application in Simultaneous Photocatalytic Degradation of Toxic Molecules

2013 ◽  
Vol 764 ◽  
pp. 255-265 ◽  
Author(s):  
R. Dhanalakshmi ◽  
A. Pandikumar ◽  
R. Ramaraj
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Potential Candidate ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Molar Ratios ◽  
Amine Functionalized ◽  
Transmission Electron

The TiO2-ZnO nanocomposite materials ((TiO2-ZnO)NCM) with different molar ratios (Ti:Zn) was synthesized by chemical route and dispersed in functionalized silicate sol-gel matrix (Silicate/(TiO2-ZnO)NCM)). The as prepared Silicate/(TiO2-ZnO)NCM were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. The dispersion of the small amount of (TiO2-ZnO)NCM in silicate sol-gel matrix paves the way for the preparation of solid-state thin film photocatalyst which is advantageous for the separation of the catalyst from solution, the substrates and the reaction products. The simultaneous photoinduced oxidation of methylene blue (MB) dye and reduction of Cr (VI) to Cr (III) was examined at different amine functionalized silicate sol-gel embedded (TiO2-ZnO)NCM films. The (TiO2-ZnO)NCM dispersed into the amine functionalized silicate sol-gel matrix (TPDT) exhibited enhanced photocatalytic activity when compared to the (TiO2-ZnO)NCM without the silicate sol-gel. The functionalized silicate sol-gel supported (TiO2-ZnO)NCM is a potential candidate for energy conversion and environment remediation and cleaning applications.

Controlling the Absorption of Gold Nanoparticles via Green Synthesis Using Sargassum crassifolium Extract

2018 ◽  
Vol 765 ◽  
pp. 44-48 ◽  
Author(s):  
Angeline F. Maceda ◽  
Johnny Jim S. Ouano ◽  
Mar Christian O. Que ◽  
Blessie A. Basilia ◽  
Melchor J. Potestas ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Ftir Spectroscopy ◽  
Capping Agent ◽  
Visible Spectroscopy ◽  
Spectroscopy Analysis ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Uv Visible

This work controls the absorption of gold nanoparticles (GNPs) via green synthesis utilizingSargassumcrassifoliumextract. The amount of seaweed extract acts as both reducing (from Au+to Au0) and capping agent. TheS.crassifoliumextract is mainly composed of biomolecules such as protein and phenolic compounds which are responsible for the synthesis of GNPs. The synthesized GNPs were characterized using UV-Visible spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and Transmission Electron Microscopy (TEM). UV-Vis spectra revealed peaks around 505 nm to 544 nm which corresponds to the Surface Plasmon Resonance (SPR) of GNPs. FTIR spectroscopy analysis showed peak at 825 cm-1and 1144 cm-1which corresponds to the signature peaks of GNPs. Polydisperse GNPs with varied sizes (between 5 nm to 300 nm) were further confirmed by TEM analysis.

scholarly journals Characterization of Enhanced Antibacterial Effects of Silver Loaded Cerium Oxide Catalyst

2018 ◽  
Vol 34 (6) ◽  
pp. 2895-2901
Author(s):  
Gusliani Eka Putri ◽  
Syukri Arief ◽  
Novesar Jamarun ◽  
Feni Rahayu Gusti ◽  
Annisa Novita Sary
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Sol Gel ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
The Difference

Silver-cerium nanoparticles had been successfully synthesized using the sol-gel method by silver nitrate as a source of silver and cerium nitrate hexahydrate as a source of cerium. The synthesized silver-cerium nanoparticles had been characterized by X-ray diffraction,transmission electron microscopy, and scanning electron microscopy-energy dispersive X-ray. Based on the results of XRD and TEM analysis showed silver-cerium nanoparticles were spherical with the dominant size range of 8.9 -12.73 nm. SEM-EDX analysis showed silver nanoparticles covered by cerium nanoparticles that were known as the core-shell structure. Silver nanoparticles doped with cerium nanoparticles (CeONP) showed an increase in inhibitory with an increase a zone of inhibition after being doped with cerium nanoparticles. The disinfection effect of Ag-doped CeONP was more pronounced on Staphylococcus aureus than Escherichia coli, although the difference was not wide.

Sub-Micrometer SiO2@ZnMoO4:Tb3+ Core-Shell Phosphors: Sol-Gel Synthesis and Characterization

2013 ◽  
Vol 800 ◽  
pp. 436-439
Author(s):  
Hu Yang ◽  
Xiao Bo Zhang ◽  
Juan Li ◽  
Yu Jun Lu
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Emission Spectra ◽  
Green Emission ◽  
Core Shell ◽  
Uniform Size ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Shell Particles ◽  
Sol Gel Synthesis

ZnMoO4:Tb3+ phosphor layers were grown on monodisperse SiO2 particles through a simple sol-gel method, resulting in the formation of core-shell structured SiO2@ZnMoO4:Tb3+ sub-microspheres. The resulting SiO2@ZnMoO4:Tb3+ core-shell particles were characterized by powder X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM) and photoluminescence(PL). SEM and TEM analysis indicates that the obtained sub-microspheres have a uniform size distribution and obvious core-shell structure. SiO2@ZnMoO4:Tb3+ sub-microspheres show strong green emission under ultraviolet(275nm) illumination and the emission spectra are dominated by a 5D4→7F5 transition of Tb3+(543nm,green) from the ZnMoO4:Tb3+ shells. The optimum concentration for Tb3+ was determined to be 5 mol% of Zn2+ in ZnMoO4 host shells.

Synthesis and Characterization of Cadmium Sulfide Nanoparticles via a Simple Thermal Decompose Method

2016 ◽  
Vol 35 (10) ◽  
pp. 1013-1016
Author(s):  
Hamideh Seyghalkar ◽  
Mohammad Sabet ◽  
Masoud Salavati-Niasari
Keyword(s):  
Electron Microscopy ◽  
Cadmium Sulfide ◽  
Cds Nanoparticles ◽  
X Ray Diffraction ◽  
Product Size ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
Surface Purity ◽  
Ft Ir

AbstractIn this work, cadmium sulfide (CdS) nanoparticles were synthesized from a new Cd-octanoate complex via a simple thermal decompose method. The crystallinity of the product was obtained from X-ray diffraction (XRD) pattern. The morphology and product size were analyzed via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Also Fourier transform infrared (FT-IR) spectroscopy was used to investigate the CdS surface purity. Finally, the optical properties of the product were obtained from photoluminescence (PL) spectroscopy.

Preparation and Photocatalytic Properties of TiO2/SiO2Composite Nanofibers

2007 ◽  
Vol 1056 ◽  
Author(s):  
Sung Wook Lee ◽  
Tae Ho Lim ◽  
Sang Beom Kim ◽  
Dong Ho Hyun
Keyword(s):  
Electron Microscopy ◽  
Surface Morphology ◽  
Composite Nanofibers ◽  
Sol Gel ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Direct Preparation ◽  
Ft Ir ◽  
Uv Visible

ABSTRACT(1-x)SiO2/(x)TiO2composite micro/nano scale fibers with various compositions were successfully prepared by electrospinning their sol-gel precursors of titanium(IV) isopropoxide(TiP), and tetraethyl orthosilicate(TEOS), followed by calcinations. Any gelator or binder was not used in this direct preparation process for composite fibers. The surface morphology and structure of sintered composite fibers were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and Fourier transform infrared (FT-IR). The crystallization behavior and surface morphology of the as-spun fibers were largely influenced by the calcination temperature and the content of TiO2. The photocatalytic activity of SiO2/TiO2composite fibers was examined by UV-DRS spectra. The experiments demonstrated that the MB in aqueous solution was successfully photodegraded using SiO2/TiO2composite nanofibers under UV-visible light irradiation.

Transmission Electron Microscopy of an Aluminum-Silver-Stainless Steel Solid State Bond

1985 ◽  
Vol 43 ◽  
pp. 172-173
Author(s):  
M. J. Carr ◽  
J. F. Shewbridge ◽  
T. O. Wilford
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid State ◽  
Specimen Preparation ◽  
Dimensional Control ◽  
Tem Analysis ◽  
Metal Parts ◽  
Dissimilar Metal ◽  
Transmission Electron ◽  
Short Time

Strong solid state bonds are routinely produced between physical vapor deposited (PVD) silver coatings deposited on sputter cleaned surfaces of two dissimilar metal parts. The low temperature (200°C) and short time (10 min) used in the bonding cycle are advantageous from the standpoint of productivity and dimensional control. These conditions unfortunately produce no microstructural changes at or near the interface that are detectable by optical, SEM, or microprobe examination. Microstructural problems arising at these interfaces could therefore easily go undetected by these techniques. TEM analysis has not been previously applied to this problem because of the difficulty in specimen preparation. The purpose of this paper is to describe our technique for preparing specimens from solid state bonds and to present our initial observations of the microstructural details of such bonds.

Synthesis of ZnO/ZnFe2O4 nanocomposites in organic-free media and their photocatalytic activity under natural sunlight

2020 ◽  
Vol 14 (2) ◽  
pp. 6801-6810
Author(s):  
Rahmayeni Rahmayeni ◽  
Zulhadjri Zulhadjri ◽  
Yeni Stiadi ◽  
Agusnar Harry ◽  
Syukri Arief
Keyword(s):  
Electron Microscopy ◽  
Hexagonal Wurtzite Structure ◽  
Rice Grain ◽  
X Ray Diffraction ◽  
Homogeneous Sphere ◽  
Natural Sunlight ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Free Media ◽  
Photocatalytic Applications

Nanocomposite ZnO/ZnFe2O4 photocatalysts with different proportions of ZnFe2O4 were synthesized in organic-free media using metal nitric as precursors. The ZnO phase with hexagonal wurtzite structure and low crystallinity of ZnFe2O4 was confirmed using XRD (X-Ray diffraction). Different morphologies of the nanocomposites were obtained ranging from rice grain-like with a porous surface to homogeneous sphere-like nanoparticles as shown in Scanning Electron Microscopy (SEM) and TEM Transmission Electron Microscopy (TEM) studies. Magnetic properties measured by Visible Sampler Magnetometer (VSM) showed diamagnetic and paramagnetic behavior for the nanocomposites. Analysis with Diffuse Reflectance Spectrophotometer (DRS) UV-vis showed an increase the composition of ferrite in composites increasing its ability to absorb visible light. Photocatalytic activities of ZnO/ZnFe2O4 nanocomposites on the degradation of Rhodamine B dye reached 95.6% after 3 h under natural sunlight suggesting their suitability for sunlight driven photocatalytic applications. 

TEM Sample Preparation Tricks for Advanced DRAMs

2015 ◽  
Author(s):  
Ching Shan Sung ◽  
Hsiu Ting Lee ◽  
Jian Shing Luo
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sample Preparation ◽  
Integrated Circuit ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Tem Analysis ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Characterization Of Materials

Abstract Transmission electron microscopy (TEM) plays an important role in the structural analysis and characterization of materials for process evaluation and failure analysis in the integrated circuit (IC) industry as device shrinkage continues. It is well known that a high quality TEM sample is one of the keys which enables to facilitate successful TEM analysis. This paper demonstrates a few examples to show the tricks on positioning, protection deposition, sample dicing, and focused ion beam milling of the TEM sample preparation for advanced DRAMs. The micro-structures of the devices and samples architectures were observed by using cross sectional transmission electron microscopy, scanning electron microscopy, and optical microscopy. Following these tricks can help readers to prepare TEM samples with higher quality and efficiency.

Sign in / Sign up

Export Citation Format

Share Document