scholarly journals Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-precipitation Method

2021 ◽  
Author(s):  
P. Raju ◽  
Joseph Prince Jesuraj ◽  
S. Muthukumaran
Keyword(s):  
Energy Gap ◽  
Precipitation Method ◽  
Co Precipitation

scholarly journals Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-Precipitation Method

2021 ◽  
Author(s):  
P. Raju ◽  
Joseph Prince Jesuraj ◽  
S. Muthukumaran
Keyword(s):  
Crystallite Size ◽  
Energy Gap ◽  
Wavelength Region ◽  
Lattice Parameter ◽  
Precipitation Method ◽  
Optical Absorbance ◽  
Stability Measurement ◽  
Cubic Structure ◽  
The Stability ◽  
Co Precipitation

Abstract The controlled synthesis of Cd0.9Zn0.1S, Cd0.89Zn0.1Cu0.01S and Cd0.87Zn0.1Cu0.03S nanostructures by simple chemical co-precipitation technique was reported. The XRD investigation confirmed the basic CdS cubic structure on Zn-doped CdS and also Zn, Cu dual doped CdS with no secondary/impurity related phases. No modification in cubic structure was detected during the addition of Zn/Cu into CdS. The reduction of crystallite size from 63 Å to 40 Å and the changes in lattice parameter confirmed the incorporation of Cu into Cd0.9Zn0.1S and generation of Cu related defects. The shift of absorption edge along upper wavelength region and elevated absorption intensity by Cu doping can be accredited to the collective consequence of quantization and the generation of defect associated states. The enhanced optical absorbance and the reduced energy gap recommended that Cd0.87Zn0.1Cu0.03S nanostructure is useful to enhance the efficiency of opto-electronic devices. The presence of Cd-S / Zn-Cd-S /Zn/Cu-Cd-S chemical bonding were confirmed by Fourier transform infrared investigation. The elevated green emissions by Cu incorporation was explained by decrease of crystallite size and creation of more defects. Zn, Cu dual doped CdS nanostructures are recognized as the possible and also efficient photo-catalyst for the removal dyes like methylene blue. The enhanced photo-catalytic behaviour of Zn, Cu dual doped CdS is the collective consequences of high density electron-hole pairs creation, enhanced absorbance in the visible wavelength, surface area enhancement, reduced energy gap and the formation of novel defect associated states. The stability measurement signified that Cu doped Cd0.9Zn0.1S exhibits superior dye removal ability and better stability even after 6 repetitive runs with limited photo-corrosion.

scholarly journals Thermopower Enhancement of Rutile-type SnO2 Nanocrystalline Using Facile Co-Precipitation Method

2020 ◽  
Vol 20 (2) ◽  
pp. 82
Author(s):  
Nadya Larasati Kartika ◽  
Budi Adiperdana ◽  
Asep Ridwan Nugraha ◽  
Ardita Septiani ◽  
Dadang Mulyadi ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Density Functional ◽  
Energy Gap ◽  
Oxide Semiconductor ◽  
Precipitation Method ◽  
Strongly Correlated ◽  
X Ray Diffraction ◽  
High Carrier Mobility ◽  
Co Precipitation ◽  
Quantum Espresso

Metal oxide semiconductor has attracted so much attention due to its high carrier mobility. Herein, thermoelectric study of nanocrystalline SnO2 through a simple co-precipitation method is conducted to enhance the Seebeck coefficient (S). X-ray diffraction, thermogravimetric analysis (TGA), resistivity (r), Seebeck coefficient (S), and power factor (PF) measurements are conducted to analyze the thermoelectric properties of the material. The measurements show that there are two interesting results, which are the unusual resistivity behavior and the high value of the S. Resistivity behavior shows a non-reflective intermediate semiconductor-metals behavior where the turning point occurs at 250 o C. This behavior is strongly correlated to the surface oxide reaction due to annealing temperature. The maximum S likely occurs at 250 ºC, since the curve shows a slight thermopower peak at 250 ºC. The value of the S is quite high with around twenty times higher than other publications about SnO2 thermoelectric material, this happens due to the bandgap broadening. The energy gap of SnO2 calculated using density functional theory (DFT), which was performed by Quantum Espresso 6.6. The result shows that there is a broadening energy gap at different momentum or wave factor. Nanocrystalline semiconductors material is giving an impact to increase the width of bandgap due to quantum confinement and could enhance the thermopower especially in SnO2 nanocrystalline

SYNTHESIS AND CHARACTERIZATION OF (CdSe)1-X(ZnS)x MIXED POLYCRYSTALLINE SEMICONDUCTORS BY CO-PRECIPITATION METHOD

2002 ◽  
Vol 16 (19) ◽  
pp. 2885-2899
Author(s):  
K. YADAIAH ◽  
ABDUL NAYEEM ◽  
M. SOMI REDDY ◽  
M. NAGABHOOSHANAM
Keyword(s):  
Energy Gap ◽  
Nitrogen Atmosphere ◽  
Hexagonal Structure ◽  
Ion Source ◽  
Precipitation Method ◽  
Scanning Electron Micrographs ◽  
Chemical Homogeneity ◽  
X Ray ◽  
Co Precipitation

The polycrystalline (CdSe)1-x (ZnS)x semiconductor powder with (0 ≤ x ≤ 1) has been prepared by controlled co-precipitation method from an alkaline medium using thiourea as a sulphide ion source. Pellets are made out of these powders under 10 tonnes/sq.cm pressure and are sintered at 800°C for 2 hours in nitrogen atmosphere. X-ray studies have indicated that the compounds are polycrystalline in nature with mixed hexagonal structure of CdSe with x = 0-0.3 and cubic structure of ZnS with x = 1. The chemical homogeneity of the samples was observed from the EDAX and also noted that the atomic contents present were as per the constituents taken in the solution. Lattice parameters (a and c) of all the compounds are determined from the X-ray data and are found to decrease with the increase in ZnS content. It is also observed that the grain size decreases with the increase in x from 0-0.6 and later it remained almost the same till x reaches 0.9. Optical studies indicated that the energy gap was as high as 5.2 eV and remained almost same throughout the composition range x = 0-1. Scanning electron micrographs have shown platelet like structure in CdSe and mixed compounds where as a mixed Cubic and Hexagonal structure in ZnS. The results are explained based on different phases present in the compounds.

scholarly journals Structural and Optoelectronic Properties of Zinc Sulfide Thin Films Synthesized by Co-Precipitation Method

2019 ◽  
Vol 27 (2) ◽  
pp. 287-302
Author(s):  
V.H. Choudapur ◽  
S.B. Kapatkar ◽  
A.B. Raju
Keyword(s):  
Zinc Sulfide ◽  
Energy Gap ◽  
Quantum Confinement Effect ◽  
Wide Bandgap ◽  
Precipitation Method ◽  
Cubic Phase ◽  
Uv Detectors ◽  
Sulphur Concentration ◽  
Co Precipitation ◽  
Sulfide Nanocrystals

Abstract Wide bandgap Zinc Sulfide nanocrystals are prepared by a simple co-precipitation method at different precursor concentrations. The influence of sulphur concentration in Zinc sulfide on morphological, optical and electric properties is found to be significant. The Zinc Sulfide nanomaterial was prepared using low-cost starting materials and deionised water as the solvent. As synthesized Zinc Sulfide nanocrystals were analyzed using X-ray diffraction (XRD), Energy Dispersive Spectroscopy (EDS) analysis, UV-Visible Spectrophotometry, Photoluminescence (PL), Scanning electron Microscopy (SEM), Ellipsometry techniques and electric conductivity measurements. XRD patterns revealed that ZnS nanocrystals are polycrystalline, cubic phase with (111) preferred orientation. The obtained crystallites have sizes in the range of 5 to 11 nm. EDS pattern confirms the purity of the films. From optical absorption measurements, it is clear that the direct energy gap decreases from 5.2 to 4.4eV with the increase in sulphur concentration in ZnS and exhibit large quantum confinement effect. Ellipsometry was used to determine the optical constants and film thickness. The films deposited on ITO – coated glass was used to record the IV Characteristics of the films by two probe method. The wide-bandgap, conducting materials have applications in optoelectronic devices such as high-frequency UV detectors and thin-film solar cells.

scholarly journals Optical properties for prepared polyaniline / Ferro fluid nano composites

2019 ◽  
Vol 14 (31) ◽  
pp. 161-168
Author(s):  
Salma M. Hassan
Keyword(s):  
Optical Properties ◽  
Energy Gap ◽  
Chemical Oxidation ◽  
Precipitation Method ◽  
Optical Energy Gap ◽  
In Situ Chemical Oxidation ◽  
Chemical Oxidation Polymerization ◽  
Fluid Concentration ◽  
Co Precipitation

Pure nano Ferro fluid was synthesized by chemical co-precipitation method. The composite of polyaniline with nano sized Ferro fluid was prepared by In-situ–chemical oxidation polymerization method with ammonium per sulphate as an oxidant in aqueous hydrochloric acid under constant stirring at room temperature. The optical properties, absorption, transmission, optical energy gap (Eg) and optical constant refractive index (n) have been investigated. The value of the Eg decreased with increasing Ferro fluid concentration.

scholarly journals Low-Temperature Co-Precipitation Synthesis of HoFeO3 Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 238
Author(s):  
Vo Quang Mai ◽  
Nguyen Anh Tien
Keyword(s):  
Low Temperature ◽  
Single Phase ◽  
Crystal Size ◽  
Energy Gap ◽  
Precipitation Method ◽  
Optical Energy Gap ◽  
Superparamagnetic Behaviour ◽  
Different Temperatures ◽  
Co Precipitation ◽  
20 Nm

In this research, we investigate and discuss the characteristics of HoFeO3 nanoparticles synthesized by the co-precipitation method at low temperature (t° ≤ 4 °C). The single-phase HoFeO3 samples with the orthorhombic structure formed after annealing of the precipitates at different temperatures up to 950 °C. The annealed HoFeO3 nanoparticles have an average crystal size of 10–20 nm (SEM, TEM). UV-Vis spectrum of HoFeO3 sample annealed at 750 °C showed strong UV and Vis absorption with small optical energy gap (Eg = 1.56 eV). In the range temperature of 100–300 K, the HoFeO3 samples showed superparamagnetic behaviour at 5 kOe with high magnetization (Ms = 1.3–2.4 emu/g) and very low susceptibility (χ << 1).

SYNTHESIS AND CHARACTERIZATION OF Cd1-xZnxS:Cu CRYSTALS BY CO-PRECIPITATION METHOD

2001 ◽  
Vol 15 (17) ◽  
pp. 2387-2407 ◽  
Author(s):  
ABDUL NAYEEM ◽  
K. YADAIAH ◽  
G. VAJRALINGAM ◽  
P. MAHESH ◽  
M. NAGABHOOSHANAM
Keyword(s):  
Energy Gap ◽  
Precipitation Method ◽  
Optical Energy Gap ◽  
Chemical Homogeneity ◽  
X Ray ◽  
Cubic Structure ◽  
Co Precipitation ◽  
Controlled Precipitation

Copper doped Cd 1-x Zn x S compounds were prepared by controlled precipitation method with 0≤x≤1. The samples were characterized by X-ray, chemical analysis, optical absorption, and SEM studies. The X-ray studies have indicated that the compounds have polycrystalline nature with mixed Hexagonal and Cubic structure of CdS with x=0–0.6, the structure changed to a prominent cubic structure of ZnS with x>0.6. Optical studies have shown that the grain size increased with x varying from 0–0.2 and then it decreased. It was also observed that the optical energy gap decreased with x till x ⋍ 0.2, attained a minimum with x=0.2 and then it increased gradually. The values of E g obtained for CdS and ZnS were 2.21 eV and 2.53 eV. The chemical homogeneity of the samples was also observed from the EDAX and noted that the sulfur and copper contents remained almost the same, and the decrease in Cd and increase in Zn atoms occurred systematically. The results were explained on the basis of different phases formed and the role of copper impurity.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

Exploring the characterization of Ni doped MgO nanoparticles using co-precipitation method

2020 ◽  
Vol 3 (1) ◽  
pp. 30-33
Author(s):  
Muthulakshmi M ◽  
Madhumitha G
Keyword(s):  
Magnesium Oxide ◽  
Analytical Techniques ◽  
Nickel Chloride ◽  
Precipitation Method ◽  
Crystalline Powder ◽  
High Melting Point ◽  
Design Synthesis ◽  
Mgo Nanoparticles ◽  
Co Precipitation

Nanotechnology is a field of applied science focused on design, synthesis and characterization of nanomaterials. The nickel and magnesium have improved their applications in transparent electrodes and nano electronics. In addition, magnesium oxide has moisture resistance and high melting point properties. In the present work has been carried out in the development of green crystalline powder of nickel doped magnesium oxide nanoparticles by Co-precipitation method, from the mixture of nickel chloride and magnesium chloride with KOH as solvent. From the XRD results, crystalline size of the particle can be observed. Spherical structure of Ni doped MgO nanoparticles were indicated by SEM results and powdered composition of samples were obtained from FTIR. EDAX represents the peak composition of the nanoparticle. The above analytical techniques have confirmed that the Ni doped MgO nanoparticles obtained from the mixture of NiCl2 and MgCl2.

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