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- 저자 : Ali A. S. M. Zahid (검색결과 2 건)
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마문,Ali A. S. M. Zahid,이인섭,강홍석,한재량 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.11
Self-assembled monolayers (SAMs) of mixed 1-octanethiol (OT) and 1-decanethiol (DT) that were formed on gold substrates at a high incubation temperature in a sealed container were characterized using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). In mixed-composition monolayer films, self-assembly of the mixture could induce phase separation into discrete molecular domains at higher incubation temperatures. Mixtures of the alkanethiol molecules affected the domain size, defect density, packing density, and binding features of the resultant SAMs prepared on gold substrates. Single-molecule-resolved STM images of mixed SAMs revealed both c(4 × 2) − ns (non-shifted) for DT and c(4 × 2) − s (shifted) for OT domains. For the mixed SAMs, the peak S2 (XPS) increased in intensity relative to the peak S1, reflecting significant modifications in the binding characteristics of the thiols and surface roughness upon mixing.
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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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