FTIR Characterization Of PZT Nano Fibers Synthesized from Metallo-organic Compounds Using Electrospinning

2002 ◽  
Vol 736 ◽  
Author(s):  
Yu Wang ◽  
Jorge J. Santiago-Avilés
Keyword(s):  
Substrate Surface ◽  
Pyrochlore Phase ◽  
Precursor Solution ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Good Correspondence ◽  
X Ray ◽  
Ftir Characterization ◽  
Silicon Substrate Surface

ABSTRACTWe have synthesized Pb(Zr0.54Ti0.48)O3 fibers with diameter ranging from 500 nm to several microns using electrospinning and metallo-organics decomposition (MOD) techniques. By a refinement of our electrospinning technique, i.e. by increasing the viscosity of the precursor solution, and by adding a filter to the tip of the syringe, the diameter of synthesized PZT fibers has been reduced to the neighborhood of a hundred nanometers. The complex thermal decomposition was characterized using Fourier-transform infrared (FTIR) spectroscopy and x-ray diffraction (XRD). It was found that alcohol evaporated during electrospinning and that the organic groups had pyrolized before the intermediate pyrochlore phase was formed. There is a good correspondence between XRD and FTIR spectra. It was also found that a thin film of platinum coated on silicon substrate surface not only seems to have catalyzed the phase transformation to PZT but also favored the formation of 110 texture in the synthesized PZT fibers.

EFFECT OF ANNEALING ON THE PROPERTIES OF VANADIUM PENTOXIDE FILMS PREPARED BY SOL–GEL METHOD

2014 ◽  
Vol 21 (02) ◽  
pp. 1450027 ◽  
Author(s):  
YAQIANG LIU ◽  
XUELIAN DU ◽  
XUEQIN LIU
Keyword(s):  
Vanadium Pentoxide ◽  
Annealing Temperature ◽  
Substrate Surface ◽  
Sol Gel ◽  
Amorphous Structure ◽  
Spectral Transmittance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tauc Plot ◽  
Silicon Substrate Surface

The vanadium pentoxide ( V 2 O 5) films were obtained by using sol–gel procedure and then were annealed at different temperature in air. The effect of different annealing temperatures on the composition, the microstructure, the surface morphology and the optical properties of the films were characterized by methods such as by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and spectral transmittance. The results revealed that the film annealed at 150°C has amorphous structure and dense with a smooth surface and the films annealed at 300°C and 450°C have a polycrystalline V 2 O 5 structure with preferred growth orientation along (001) planes, the c-axis and perpendicular to the silicon substrate surface. From the spectral transmittance we determined the absorption edge using the Tauc plot. The results indicated that optical bandgap of V 2 O 5 thin films decreased with annealing temperature.

PVP-Assisted Sb-Doped SnO2 Nanofibers Synthesized by Electrospinning Process

2016 ◽  
Vol 675-676 ◽  
pp. 150-153
Author(s):  
Somtop Santibenchakul ◽  
Suwan Chaiyasith ◽  
Wisanu Pecharapa
Keyword(s):  
Crystal Structure ◽  
Tin Oxide ◽  
Doping Concentration ◽  
Precursor Solution ◽  
Injection Rate ◽  
Electrospinning Process ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Sb Doping

Well-defined Sb-doped tin oxide (ATO) nanofibers were synthesized by electrospinning technique. Polyvinylpyrrolidone (PVP), SnCl4·5H2O and SbCl3 were chosen as suitable precursors for preparing ATO nanofibers. All of precursors were homogeneously dissolved with the mixture solvent of dimethylformamide (DMF) and absolute ethanol. Electrospinning process was carried out at applied voltage of 10 kV and distance between needle tip to aluminium foil collector was fixed at 10 cm. The injection rate of precursor solution was controlled at 0.5 ml/hr. The as-spun nanofibers were calcined at 600°C with heating rate of 5 °C/min in order to remove the PVP template and improve the crystallinity of ATO structure. Effect of Sb doping concentration on their crystal structure was investigated. The morphology and crystal structure of the electrospun fibers were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). In this work, the obtained ATO nanofibers had average range diameter from 150 to 350 nm with rough surface. Sb doping concentration in ATO nanofibers plays a key role on their network morphology. The excellent doping concentration of Sb that offered the continuous fibrous and porous ATO nanofibers was 7%.

scholarly journals Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite

Open Physics ◽  
2013 ◽  
Vol 11 (2) ◽  
Author(s):  
Aleksandra Mielewczyk-Gryn ◽  
Tomasz Lendze ◽  
Katarzyna Gdula-Kasica ◽  
Piotr Jasinski ◽  
Andrzej Krupa ◽  
...  
Keyword(s):  
Sintering Temperature ◽  
Perovskite Phase ◽  
Pyrochlore Phase ◽  
Diffraction Method ◽  
Total Conductivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Interaction ◽  
Composite Samples

AbstractA composite of CaTi0.9Fe0.1O3 and electrolyte material, i.e. magnesium doped La0.98Mg0.02NbO4 was prepared and studied. The phase content and the sample microstructure was examined by an X-ray diffraction method and scanning electron microscopy. EDS measurements were done both for composite samples and the diffusion couple. The electrical properties were studied by four terminal DC method. The high-temperature interaction between the two components of the composite has been observed. It has been suggested that lanthanum diffused into the perovskite phase and substituted for calcium whereas calcium and niobium formed the Ca2Nb2O7 pyrochlore phase. At 1500°C very large crystallites of the pyrochlore were observed. Regardless of strong interaction between the composite components, its total conductivity was weakly dependent on the sintering temperature.

Adhesion Characterization of Zinc-Substituted Hydroxyapatite Coatings

2016 ◽  
Vol 720 ◽  
pp. 189-192
Author(s):  
Marcelo Henrique Prado da Silva ◽  
Daniel Navarro da Rocha ◽  
Felipe Nobre Moura ◽  
Andrea Machado Costa ◽  
Luis Henrique Leme Louro
Keyword(s):  
Hydrothermal Process ◽  
Precursor Solution ◽  
Second Step ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydroxyapatite Coatings ◽  
Zn Concentration ◽  
Zn Content ◽  
Scratch Tests

In this study, hydroxyapatite and Zn-containing hydroxyapatite coatings were produced and characterized with respect to adhesion. The coating technique consists of a two-step hydrothermal process. X-ray diffraction (XRD) analyses showed that, in the first step, the coatings consisted of parascholzite (JCPDS-01-086-2372), a mixture of parascholzite and monetite (JCPDS-01-071-1759), or parascholzite and brushite (JCPDS-72-0713), depending on Zn concentration in the precursor solution. The second step consisted of an alkali conversion in a KOH solution. The final coating was identified as pure hydroxyapatite (HA) or Zn-doped hydroxyapatite, depending on the precursor solution Zn content. Scratch tests on the pure HA coatings showed higher adhesion, when compared to Zn-substituted HA coatings.

Characterization of polyherbal-incorporated polycaprolactone nanofibrous mat for biomedical applications

2019 ◽  
Vol 34 (4-5) ◽  
pp. 401-411
Author(s):  
Rajalakshmi Ramamoorthy ◽  
Muthumanickkam Andiappan ◽  
Murugesan Muthalagu
Keyword(s):  
Drug Release ◽  
Biomedical Applications ◽  
X Ray Diffraction ◽  
Time Intervals ◽  
Drug Release Rate ◽  
Electrospinning Technique ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Physical And Chemical

The polyherbal-loaded polycaprolactone nanofibrous mat was prepared by electrospinning technique, and physical and chemical characteristics of nanofibrous mats were studied using scanning electron microscopy, x-ray diffraction, thermogravimetric analyzer, and Fourier transform infrared spectroscopy. The presence of various phytochemicals in the crude monoherbal and polyherbal extracts was analyzed. The antimicrobial activity and biocompatibility of the polyherbal-loaded nanofibrous mats were studied. The drug release pattern of the polyherbal-loaded nanofibrous mats was studied at different time intervals. The 5% drug-loaded nanofibrous mat shows higher sustainable drug release rate than 1% and 3% drug-loaded nanofibrous mats. The cell viability was found to be 98.91%, 98.77%, 98.5%, and 98.22% for polycaprolactone and 1%, 3%, and 5% for polyherbal-loaded nanofibrous mats, respectively.

Preparation and Characterization of Perovskite Pb(Mg1/3Nb2/3)O3-PbTiO3 by a Modified Polymerized Complex Process

2008 ◽  
Vol 368-372 ◽  
pp. 30-32 ◽  
Author(s):  
Jin Chen ◽  
Hui Qing Fan ◽  
Shao Jun Qiu
Keyword(s):  
Lead Acetate ◽  
Perovskite Phase ◽  
Pyrochlore Phase ◽  
Phase Evolution ◽  
Complex Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Complex Process ◽  
Scanning Electron

Relaxor-based ferroelectrics, 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (PMN-PT) with a pyrochlore-free phase, was prepared by a modified polymerized complex process. The reactive columbite (MgNb2O6) phase was synthesized by the polymerized complex method at 1050oC for 4 h with 3wt% excess MgO. Lead acetate and tetrebutyl titanate were used to synthesize pyrochlore-free PMN-PT powder via the columbite route, from 800oC to 900oC, in air for 4 h. X-ray diffraction and scanning electron microscopy were used to detect the perovskite phase evolution and the presence of the pyrochlore phase in PMN-PT. The formation of perovskite PMN-PT is a function of the time and temperature conditions of the precursor calcinations, and an optimum condition for the thermal decomposition of the precursor was determined to avoid the formation of the pyrochlore phase.

Fabrication and Optical Characterization of Silicon Carbide Nanofibers

2007 ◽  
Vol 1006 ◽  
Author(s):  
Saima Khan ◽  
Aurangzeb Khan ◽  
Martin E. Kordesch
Keyword(s):  
Silicon Carbide ◽  
Polyethylene Oxide ◽  
Average Diameter ◽  
Main Peak ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Broad Emission ◽  
Infrared Spectral

AbstractSilicon Carbide (SiC) nanofibers were synthesized from SiC powder dispersed in polyethylene oxide (PEO) solution in Chloroform using the electrospinning technique. The as-spun fibers were then annealed at 1000ËC to 7 hours. The average diameter of the annealed fibers is 500 nm while the length of the annealed fibers is about 50 µm. The fibers were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD) and Cathodoluminescence (CL). PL spectra from the annealed SiC fibers show a broad emission in the red-infrared spectral regime. The main peak is centered at 774 nm while the shoulder on the left is at 740 nm

Preparation and Characterization of Poly(Vinyl Alcohol) Nanofibers Containing ZnS Nanopaticles via Electrospinning

2007 ◽  
Vol 121-123 ◽  
pp. 641-644 ◽  
Author(s):  
H.Y. Wang ◽  
Yi Yang Zhao ◽  
Z.Y. Li ◽  
Xiao Feng Lu ◽  
C. Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Violet Emission ◽  
X Ray ◽  
Transmission Electron ◽  
Spectroscopy Studies

Poly(vinyl alcohol) (PVA) nanofibers containing functional ZnS nanoparticles have been successfully prepared by electrospinning technique. The ZnS/PVA mixture solution for electrospinning was obtained by reacting Zn(Ac)2 with Na2S in the PVA aqueous solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses revealed that the morphology of the ZnS/PVA nanofibers consists of the dispersion of ZnS nanopaticles with cubic structure in PVA nanofibers. The coordinations between –OH and Zn2+ were characterized by infrared spectroscopy. The photoluminescence spectroscopy studies showed that the ZnS/PVA nanofibers had a strong blue-violet emission band at 450 nm, which may be associated with defect-related emission of the ZnS.

Structural and Optical Characterization of Chemically Deposited Cuprous Oxide (Cu2O) Thin Film

2013 ◽  
Vol 678 ◽  
pp. 118-122 ◽  
Author(s):  
P. Usha Rajalakshmi ◽  
Rachel Oommen
Keyword(s):  
Cuprous Oxide ◽  
Optical Band Gap ◽  
Precursor Solution ◽  
Copper Nitrate ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Glass Slides ◽  
Cu2o Films

Thin films of cuprous oxide are grown on microscope glass slides by chemical bath deposition technique. Molar solutions of copper nitrate, hydrazine and TEA constituted the chemical bath. The depositions are made by optimizing the concentration of precursor solution. X-ray diffraction measurements revealed the phase formation in the oxide films. The optical characteristics of Cu2O films are analyzed by means of UV-Vis-NIR spectrophotometer. The effect of annealing on the structural and optical properties of the film is investigated. The calculated direct optical band gap of the films is in the range of 2.4-1.8 eV.

Structural characterization of thin films of the SrBi2Nb2O9ferroelectric Aurivillius phase epitaxially grown on (110)SrTiO3

2003 ◽  
Vol 36 (1) ◽  
pp. 96-102 ◽  
Author(s):  
J.-R. Duclère ◽  
M. Guilloux-Viry ◽  
A. Perrin
Keyword(s):  
Substrate Surface ◽  
A Priori ◽  
Relative Weight ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
Aurivillius Phase ◽  
X Ray ◽  
Film Substrate ◽  
Two Peaks

Aurivillius-phase SrBi2Nb2O9(SBN) films grown by pulsed-laser deposition on (110)SrTiO3are nearly (116) oriented as shown by their X-ray diffraction θ–2θ scans. A specific artifact, leading possibly to an erroneous deduction of a (115) and (116) mixture of orientations, has been highlighted. The films present a quite small mosaicity (ω-scan full width at half-maximum = 0.2–0.5°). Sharp electron channeling patterns (ECPs) with the expected twofold symmetry are the signature of film epitaxy. These ECPs often display the superimposition of two individual patterns, rotated by 180° with respect to each other: two families of oriented SBN crystallites, rotated in the same way, coexist in the films. Indeed, from symmetry considerations at the film–substrate interface, these two families area prioriequiprobable. Similarly, two peaks, 180° shifted, are observed for the 00 10 reflection φ scans and fully confirm this model. However, their relative intensity, which gives access to the quantitative distribution of the two families, shows that in many cases the two families do not present the same relative weight, in good correlation with the qualitative ECP observations, indicating a subtle asymmetrization at the nucleation or growth stage. The in-plane orientation is defined as: [\bar{1}10]F|| [001]Sand nearly [33\bar{1}]For [\bar{3}\bar{3}1]F|| [\bar{1}10]S(generating the two families). The film–substrate interfacial relationship is discussed, taking into account the possible facetting of the substrate surface and the occurrence of the (11\bar{7}) SBN plane as twin boundary.

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