Chitosan capped Ag/NiS nanocomposites: A novel colorimetric probe for detection of L-cysteine at nanomolar level and its anti-microbial activity
Bijandra KumarMohammad K. OklaMostafa A. Abdel-MaksoudWahidah H. Al‐QahtaniHamada AbdElgawadMunirah Saud AltukhayfiAjith M. ThomasLija L. RajuS. Sudheer Khan
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Flower-like MoS2 microspheres assembled by nanosheets have been successfully synthesized by a facile, environmentally friendly reaction in closed reactor at moderate temperature. The obtained products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The influences of reaction temperature and duration time were carefully investigated.
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The structure of Nb2O5 nanotubes was studied by electron diffraction and high-resolution transmission electron microscopy (HRTEM). The nanotubes were prepared from highly crystalline-layered K4Nb6O17 crystals grown from a KCl flux using the intercalating and exfoliating techniques. Nanotubes have a length of about 200 nm and a diameter of 20 nm. The observed electron diffraction patterns revealed that the nanotubes have a helical structure with the basal plane of (010) and the tube-axis parallel to the [201] direction. Their basal plane corresponds to the (010) plane of the layered K4Nb6O17 crystals. The helical lattice plane was directly observed by a Fourier filtered HRTEM image. Copyright © 2014 John Wiley & Sons, Ltd.
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Novel SrNb2O6 nanotubes with rhombic cross sections were produced via a facile hydrothermal route without any surfactants or templates by controlling the reaction conditions, such as the pH value and temperature. The prepared nanotubular powders were characterized using X-ray diffraction, field-emission electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). From the FESEM and HRTEM analysis, it was found that the morphological evolution of the one-dimensional tubular structure was originated from the stepwise bending growth in the [011] direction around the a-axis and its rhombic cross section was connected to the crystallographic nature.
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Remarkably oxidation-resistant nanoparticles of iron prepared at Tianjin University have been studied by electron diffraction and high-resolution transmission electron microscopy (HRTEM). HRTEM images clearly show the polyhedral epitaxy of γ-Fe2O3 layers on equivalent {100} facets of the {100} truncated {110} rhombic dodecahedral nanoparticles of iron. Oxide layers on {110} facets are formed by the lateral extension of the epitaxial {100} γ-Fe2O3 layers over adjacent {110} facets. The {110} oxide layers are bent and concave inward. The compressive γ-Fe2O3 layers which are about 4 nm thick give effective protection, according to the theory of Caberra–Mott, to the iron core from further oxidation.
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Nanorod
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As a demonstration of ab initio structure characterizations of nano metal organic framework (MOF) crystals by high resolution transmission electron microscopy (HRTEM) and electron diffraction tomography methods, a Zr-MOF (UiO-66) structure was determined and further confirmed by Rietveld refinements of powder X-ray diffraction. HRTEM gave direct imaging of the channels.
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Novel nanoplate-composed flowerlike Ag micro-nano structures were fabricated by a simple aqueous solution route.The products were characterized by X-ray diffraction(XRD),scanning electronic microscopy(SEM),transmission electron microscopy(TEM),high resolution transmission electron microscopy(HRTEM),and selected area electrical diffraction(SAED).The effect of pH on the morphology of the products was investigated and the mechanisms of the formation of the flowerlike Ag micro-nano structures were discussed preliminarily.The products were composed of a great deal of interlaced nanoplates,experiments indicated that these micro-nano structures have very strong SERS activity as SERS substrates.
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Microstructure changes of tungsten/carbon ( W / C ) multilayer films with heat treatments were investigated by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction. When the W / C amorphous multilayer films were annealed in vacuum at 800 or 900°C, the X-ray reflectivity became 30% higher than that of as-prepared ones in association with a slight increase of the periodic spacing of the multilayers. HRTEM images of the annealed specimens revealed the existence of randomly distributed microcrystallites of W 2 C in the W layers. The increase of X-ray reflectivity was interpreted well with a simple structural model assuming the decrease of the C -atom-number density in the C layers.
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