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- 저자 : A. R. Butt (검색결과 2 건)
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Influence of Iron Doping on Structural, Optical and Magnetic Properties of TiO2 Nanoparticles
R. Zahid,M. Manzoor,A. Rafi q,M. Ikram,M. Nafees,A. R. Butt,S. G. Hussain,S. Ali 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.5
In this study, various concentrations of Fe doped TiO2nanoparticles have been successfully synthesized using the sol–gelmethod. A variety of characterization techniques as ultra-violet visible (UV–Vis) spectroscopy, X-ray diffractometer (XRD),vibrating sample magnetometry (VSM) and field emission scanning electron microscopy (FESEM) were employed to analyzethe prepared nanopowders. XRD measurement confirmed the substitution of Fe ion without disturbing the tetragonal crystalsystem of TiO2. The crystallite size was found to decrease and lattice strain increases upon doping estimated by WilliamsonHall plot. Furthermore, the average grain size calculated by FESEM found was between 10 and 30 nm for pure and dopedTiO2. UV–Vis spectroscopy showed an increase in absorption accompanied red shift and increase in band gap energies from3.36 to 3.62 eV with the addition of Fe. The FTIR spectroscopy was employed to confirm the presence of functional groupsin the fabricated nanopowders. Upon mixing the saturation magnetization (Ms) varying from (2.12 to 1.51)10−2 emu/g wasobserved.
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Yetisen, A.K.,Butt, H.,Volpatti, L.R.,Pavlichenko, I.,Humar, M.,Kwok, S.J.J.,Koo, H.,Kim, K.S.,Naydenova, I.,Khademhosseini, A.,Hahn, S.K.,Yun, S.H. Pergamon Press ; Elsevier Science Ltd 2016 BIOTECHNOLOGY ADVANCES Vol.34 No.3
<P>Analyte-sensitive hydrogels that incorporate optical structures have emerged as sensing platforms for point-of-care diagnostics. The optical properties of the hydrogel sensors can be rationally designed and fabricated through self-assembly, microfabrication or laser writing. The advantages of photonic hydrogel sensors over conventional assay formats include label-free, quantitative, reusable, and continuous measurement capability that can be integrated with equipment-free text or image display. This Review explains the operation principles of photonic hydrogel sensors, presents syntheses of stimuli-responsive polymers, and provides an overview of qualitative and quantitative readout technologies. Applications in clinical samples are discussed, and potential future directions are identified. (C) 2015 Elsevier Inc. All rights reserved.</P>
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