scholarly journals Variation in the material properties by nickel substitution in copper tellurate

2020 ◽  
Author(s):  
Sudarshana Dhanarath Mardolkar ◽  
A. V. Salker
Keyword(s):  
Visible Region ◽  
Photoluminescence Property ◽  
Precipitation Method ◽  
Magnetic Studies ◽  
Dielectric Parameters ◽  
Chemical Route ◽  
Wide Range ◽  
Lower Temperature ◽  
Co Precipitation ◽  
First Time

Abstract A series of pristine and nickel doped copper tellurates possessing a wide range of applications are studied here. Use of a simple wet chemical route that is co-precipitation method has been employed for the first time, which involves the formation of desired compounds at a relatively lower temperature, thus modifying their properties. All the prepared compounds are characterized and investigated by XRD, TG – DTA, XPS, SEM, TEM to examine their phase purity, thermal stability, chemical state, and microstructural properties. The electrical resistivity studies showed an insulator - semiconductor transition behavior. Magnetic studies revealed the paramagnetic nature of the material. Antiferromagnetic to paramagnetic transition was observed at T N ~ 60 K in case of Cu 2.7 Ni 0.3 TeO 6 sample. Thermoelectric studies indicated a change in conduction mechanism with temperature. Dielectric properties with respect to frequency showed an increase in dielectric parameters with increasing dopant content. Photoluminescence property has been studied and found to show emission in the visible region.

scholarly journals Nitrogen and Bromide Co-Doped Hydroxyapatite Thin Films with Antimicrobial Properties

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1505
Author(s):  
Simona Liliana Iconaru ◽  
Carmen Steluta Ciobanu ◽  
Daniela Predoi ◽  
Mikael Motelica-Heino ◽  
Constantin Cătălin Negrilă ◽  
...  
Keyword(s):  
Thin Films ◽  
Antimicrobial Activity ◽  
Spin Coating ◽  
Thin Layers ◽  
Precipitation Method ◽  
X Ray ◽  
Co Precipitation ◽  
First Time ◽  
Co Doped

Hydroxyapatite (Ca10(PO4)6(OH)2, HAp), due to its high biocompatibility, is widely used as biomaterial. Doping with various ions of hydroxyapatite is performed to acquire properties as close as possible to the biological apatite present in bones and teeth. In this research the results of a study performed on thin films of hydroxyapatite co-doped with nitrogen and bromine (NBrHAp) are presented for the first time. The NBrHAp suspension was obtained by performing the adapted co-precipitation method using cetyltrimethylammonium bromide (CTAB). The thin layers of NBrHAp were obtained by spin-coating. The stability of the NBrHAp suspension was examined by ultrasound measurements. The thin layers obtained by the spin-coating method were examined by scanning electron microscopy (SEM), optical microscopy (OM), and metallographic microscopy (MM). The presence of nitrogen and bromine were highlighted by energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) studies. Fourier transform infrared spectroscopy (FTIR) was used to highlight the chemical status of nitrogen and bromine. In addition, the powder obtained from the NBrHAp suspension was analyzed by XRD. Moreover, the in vitro antimicrobial activity of the NBrHAp suspensions and coatings was investigated using the reference microbial strains Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Candida albicans ATCC 10231. The results highlighted the successful obtainment of N and Br co-doped hydroxyapatite suspension for the first time by an adapted co-precipitation method. The obtained suspension was used to produce pure NBrHAp composite thin films with superior morphological properties. The NBrHAp suspensions and coatings exhibited in vitro antimicrobial activity against bacterial and fungal strains and revealed their good antimicrobial activity.

XRD and Photoluminescence Properties of CaSO4:Dy Phosphor Synthesized by New Co-Precipitation Method

2017 ◽  
Vol 888 ◽  
pp. 333-337 ◽  
Author(s):  
Nadira Kamarudin ◽  
Wan Saffiey Wan Abdullah ◽  
Muhammad Azmi Abdul Hamid
Keyword(s):  
Calcium Sulfate ◽  
Average Crystallite Size ◽  
Information Storage ◽  
Precipitation Method ◽  
Photoluminescence Properties ◽  
Orthorhombic Crystal ◽  
Phosphor Material ◽  
X Ray ◽  
Wide Range ◽  
Co Precipitation

This paper presents the luminescence properties of dysprosium (Dy) doped calcium sulfate (CaSO4) phosphor material produced by co-precipitation technique with 0.1 - 0.5 mol% concentration of dopant. The crystallinity of the produced powder was studied using x-ray powder diffraction (XRD). The XRD spectrum shows high purity anhydrite CaSO4 phosphor material produced. The average crystallite size of 74 nm with orthorhombic crystal system was obtained. The luminescence behavior of produced CaSO4: Dy was studied using a photoluminescence (PL) spectrometer. The excitation and emission spectrum peaks associated with defects and vacancies of the phosphor material at claimed crystalline phase. The mixed peaks of excitation and emission that corresponds to micro and nano sized particle was shown for the produced powders. These properties show that the produced powders have wide range of luminescence detection with many electron traps ready for thermoluminescence (TL) information storage.

Synthesis of tin oxide activated by DAN grafting and Mo nanoparticle insertion for optoelectronic properties improvement

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 95405-95416 ◽  
Author(s):  
N. Bouazizi ◽  
R. Bargougui ◽  
A. Benghnia ◽  
J. Vieillard ◽  
S. Ammar ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Optoelectronic Properties ◽  
Precipitation Method ◽  
New Material ◽  
Co Precipitation ◽  
First Time

Tin oxide (SnO2) was synthesized via a co-precipitation method and activated by 1,5 diaminonaphthalene (DAN) grafting and molybdenum nanoparticle (Mo-NPs) incorporation for the first time as a new material.

scholarly journals Synthesis, Characterization and Mechanical Properties of Nanocomposites Based on Novel Carbon Nanowires and Polystyrene

2020 ◽  
Vol 10 (17) ◽  
pp. 5737
Author(s):  
Vasilis Kostas ◽  
Maria Baikousi ◽  
Nektaria-Marianthi Barkoula ◽  
Aris Giannakas ◽  
Antonios Kouloumpis ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Analytical Techniques ◽  
Polymer Nanocomposite ◽  
Precipitation Method ◽  
Templating Method ◽  
Polymer Properties ◽  
Wide Range ◽  
First Time ◽  
Range Of Values ◽  
Carbon Nanowires

Carbon into polymer nanocomposite is so far a common additive for the enhancement of the polymer properties. The properties of the polymer, such as thermal, and especially its mechanical properties, are improved by the homogeneously dispersed carbon nanoparticles on the polymer matrix. In this study, carbon wires in nano dimensions are, for the very first time, synthesized via the hard templating method from the silicate matrix MCM-41, and used as nano additives of polystyrene. The carbon nanowires were chemically oxidized, and further modified by attaching octadecylamine molecules, for the development of organic functionalities onto carbon nanowires surface. The nanocomposite materials of polystyrene with the modified carbon nanowires were prepared by a solution-precipitation method at three nano additive to polymer loadings (1, 3 and 5 wt%). The as-derived nanocomposites were studied with a combination of characterization and analytical techniques. The results showed that the thermal and mechanical properties of the polystyrene nanocomposites gradually improved while increasing nano-additive loading until 3 wt%. More specifically, the 3 wt% loading sample showed the best mechanical properties, while the 5 wt% sample was difficult to achieve satisfactory dispersion of carbon nanowires and consequently has a wide range of values.

scholarly journals Structure, electronic properties, morphology evolution, and photocatalytic activity in PbMoO4 and Pb1−2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions

2020 ◽  
Vol 22 (44) ◽  
pp. 25876-25891
Author(s):  
E. O. Gomes ◽  
L. Gracia ◽  
A. A. G. Santiago ◽  
R. L. Tranquilin ◽  
F. V. Motta ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electronic Properties ◽  
Solid Solutions ◽  
Precipitation Method ◽  
Morphology Evolution ◽  
Water Based ◽  
Co Precipitation ◽  
First Time

In this work PbMoO4 and Pb1−2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions have been successfully prepared, for the first time, by a simple co-precipitation method and the as-synthesized samples were subjected to a water-based reflux treatment.

Co-Precipitation Synthesis of BiFeO3 Powders

2010 ◽  
Vol 105-106 ◽  
pp. 286-288 ◽  
Author(s):  
Hai Yang Bo ◽  
Guo Qiang Tan ◽  
Hong Yan Miao ◽  
Ao Xia
Keyword(s):  
Calcination Temperature ◽  
Bismuth Ferrite ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Infrared Spectrophotometer ◽  
Lower Temperature ◽  
Co Precipitation

Bismuth ferrite powders were synthesized by a simple citric acid complexing co-precipitation method at much lower temperature of 600°C. The work studies the calcination temperature and molar ratio of Fe and Bi on the structure and morphology. The as-prepared BiFeO3 powder was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscope and Fourier transform infrared spectrophotometer. The result shows that the phase pure BiFeO3 powders with cubic morphology were prepared as the calcination temperature was 600°C and molar ratio of Fe and Bi was 1:1. The nanoparticles was uniform with the size of about 200nm.

STRUCTURAL, SURFACE MORPHOLOGICAL AND MAGNETIC STUDIES OF Zn1−xFexS (x=0.00–0.10) DILUTED MAGNETIC SEMICONDUCTORS GROWN BY CO-PRECIPITATION METHOD

2018 ◽  
Vol 25 (01) ◽  
pp. 1850044
Author(s):  
M. HASSAN ◽  
M. GHAZANFAR ◽  
N. AROOJ ◽  
S. RIAZ ◽  
S. SAJJAD HUSSAIN ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Hysteresis Loops ◽  
Secondary Phase ◽  
Precipitation Method ◽  
Ferromagnetic Behavior ◽  
Magnetic Studies ◽  
Diluted Magnetic ◽  
Co Precipitation

We have fabricated Zn[Formula: see text]FexS ([Formula: see text], 0.02, 0.04, 0.06, 0.08 and 0.10) diluted magnetic semiconductors using co-precipitation method. X-ray diffraction patterns depict that Zn[Formula: see text]FexS appears as a dominant phase with cubic zinc blende structure and nanoscale crystallite size. In addition, a secondary phase of rhombohedral ZnS also appears; however, no additional phase arises that primarily belongs to Fe dopant. Using Debye–Scherrer relation, the crystallite size is found to be in the range of 20–27[Formula: see text]nm, which is in good agreement with the crystallite size calculated using the Williamson–Hall (WH) plot method. The appearance of secondary phase provoked to study the residual strain using Stokes–Wilson equation, which is nearly consistent to that observed using WH plot method. The surface morphology, revealed using scanning electron microscopy, depicts non-uniform surface structure with a variety of grains and void dimensions. Hysteresis loops measured for Zn[Formula: see text]FexS at room temperature (RT) illustrate a paramagnetic behavior at higher fields; however, small ferromagnetic behavior is evident due to the small openings of the measured hysteresis loops around the origin. The measured RT ferromagnetism reveals the potential spintronic device applications of the studied diluted magnetic semiconductors.

Preparation of highly luminescent BaSO4 protected CdTe quantum dots as conversion materials for excellent color-rendering white LEDs

2015 ◽  
Vol 3 (12) ◽  
pp. 2831-2836 ◽  
Author(s):  
Yajing Chang ◽  
Xudong Yao ◽  
Zhongping Zhang ◽  
Danlu Jiang ◽  
Yalan Yu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Precipitation Method ◽  
White Leds ◽  
Conversion Materials ◽  
Co Precipitation ◽  
Color Rendering ◽  
First Time ◽  
Excellent Color ◽  
Inorganic Matrix

For the first time, colloidal CdTe quantum dots are incorporated into an inorganic matrix, BaSO4, through a co-precipitation method.

scholarly journals Synthesis and Characterization of TiO2 Nanoparticles for Solar Cell Applications

2019 ◽  
Vol 8 (9) ◽  
pp. 2462-2465
Keyword(s):  
Solar Cell ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Synthesis Method ◽  
Pollutant Removal ◽  
Precipitation Method ◽  
Micro Particles ◽  
Wide Range ◽  
Titanium Tetra Isopropoxide ◽  
Co Precipitation

Titanium dioxide (TiO2 ) nanoparticles were synthesized using three different approaches successfully. These approaches were adopted as per different applications of TiO2 nanoparticles. These samples were characterized using X- ray diffraction (XRD) technique. XRD revealed nanocrystalline regime of TiO2 nanoparticles in each approach. The calculated size of nanoparticle was less than 11 nm in the used chemical approaches. Prominent and broad peaks were observed in XRD pattern for all samples, which showed all samples were in nanocrytalline form. The particle size was calculated for first three most intense prominent XRD peaks. By adopting sol gel method using Titanium tetra isopropoxide (TTIP) as precursor, the synthesized Titania particles were pure anatas and of size 7 to 11nm and using co-precipitation method using TiCl3 as precursor synthesized Titania were pure rutile and of size 3 to 7 nm. The co-precipitation method has been best suited for getting smaller nanoparticles. It was also observed that Solid state mechanical reduction root can be used to reduce the size of Titania micro-particles up to about 60 nm but phase of nanoparticles remains same as starting microparticles. It has been seen that the material properties of TiO2 can be tuned by proper method of synthesis. The work may play important role to choose particular synthesis method for specific application. These nano synthesized TiO2 materials may be used in a wide range of applications such as dye sensitized solar cell, photocatalysis, antibacterial, environment pollutant removal and photoactivated self cleaning properties etc

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