Investigation of structural, electronic and optical properties of pure and Ag-doped TiO sub(2) nanofibers fabricated by electrospinning

Pure and 1, 2, and 3 wt% Ag doped TiO sub(2) nanofibers were prepared by electrospinning method at different applied voltages and heights at a constant flow rate of 2 mL/h. Characterization of the prepared samples was performed by x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic f...

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Bibliographic Details
Published in:Crystal research and technology (1979) 2016-01, Vol.51 (1), p.65-73
Main Authors: Cicek Bezir, Nalan, Evcin, Atilla, Kayali, Refik, Kasikci Oezen, Murivet, Oktay, Ayse
Format: Article
Language:English
Subjects:
Atomic force microscopy
Crystal structure
Electrospinning
Nanofibers
Scanning electron microscopy
Silver
Titanium dioxide
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Summary:Pure and 1, 2, and 3 wt% Ag doped TiO sub(2) nanofibers were prepared by electrospinning method at different applied voltages and heights at a constant flow rate of 2 mL/h. Characterization of the prepared samples was performed by x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microcopy (AFM),four point probe method (FPPM), the differential scanning calorimetry/the thermal gravimetric analysis (DSC/TGA), ultraviolet/visible spectrometry (UV/VIS), and energy dispersive X-ray spectrometer (EDX). It was found that the thermally untreated pure TiO sub(2) nanofibers and thermally treated (at 500 degree C) samples have the crystalline phase of anatase (A), and mixed anatase and rutile (A+R) phases, respectively. It was also observed that the content of the silver does not affect the crystal structure, but plays strengthening role in the rutile structure. SEM micrographs showed that all fabricated nanofiber samples have uniform morphologies, and AFM measurements indicated that the nanofibers were formed in three-dimensional coils. The band gap values of the nanofiber samples obtained from UV/VIS measurements revealed that band gap values of the nanofiber samples decrease while the diameter of the nanofiber increases. SEM images of the thermally untreated and treated and AFM image of thermally untreated with 3% Ag doped TiO sub(2) nanofibers are seen. The diameters of thermally treated fibers decrease without having any change in their shapes much. AFM images at below shows that the nanofibers are developed as three-dimensional coils under the action two repulsive electric forces between the uniformly distributed charges carried with the jet.
ISSN:0232-1300
1521-4079
DOI:10.1002/crat.201500159