Prof. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street

354

Publications Which contain the keyword: TEM

Compensation of native donor doping in ScN: Carrier concentration control and p-type ScN

2018-09-26 10:50:25 Keywords TEM,

Scandium nitride (ScN) is an emerging indirect bandgap rocksalt semiconductor that has attracted significant attention in recent years for its potential applications in thermoelectric energy conversion devices, as a semiconducting component in epitaxial metal/semiconductor superlattices and as a substrate material for high quality GaN growth. Due to the presence of oxygen impurities and native defects such as nitrogen vacancies, sputter-deposited ... Read more

Ink-Jet Printed CMOS Electronics from Oxide Semiconductors

2018-09-26 11:59:02 Keywords FIB, TEM, AFM, SEM, Field-effect transistor (FET), Oxide semiconductors,

Complementary metal oxide semiconductor (CMOS) technology with high transconductance and signal gain is mandatory for practicable digital/analog logic electronics. However, high performance all-oxide CMOS logics are scarcely reported in the literature; specifi cally, not at all for solution-processed/printed transistors. As a major step toward solution-processed all-oxide electronics, here it is shown that using a highly effi cient electrolyte-gating approach one ... Read more

Void-mediated coherency-strain relaxation and impediment of cubic-to-hexagonal transformation in epitaxial metastable metal/semiconductor TiN/Al0.72Sc0.28N multilayers

2018-09-26 10:34:46 Keywords TEM, Multilayer Films, Hardness,

Bulk metastable phases can be stabilized during thin-film growth by employing substrates with similar crystal structure and lattice parameter, albeit over a thickness range limited by coherency-strain relaxation. Expanding that strategy, growth of superlattices comprising one stable and another metastable compound with similar crystal structure and lattice parameters are known to yield epitaxial stabilization over a few nanometers of thickness. ... Read more

Tailoring of surface plasmon resonances in TiN/(Al0.72Sc0.28)N multilayers by dielectric layer thickness variation

2018-09-26 09:46:25 Keywords TEM, Plasmon resonance,

Alternative designs of plasmonic metamaterials for applications in solar energyharvesting devices are necessary due to pure noble metal-based nanostructures’ incompatibility with CMOS technology, limited thermal and chemical stability, and high losses in the visible spectrum. In the present study, we demonstrate the design of a material based on a multilayer architecture with systematically varying dielectric interlayer thicknesses that result in ... Read more

Recent advances in synthesis, characterization and biological activity of nano sized Schiff base amino acid M (II) complexes

2018-09-16 13:48:24 Keywords DNA interaction, Antimicrobial, TEM, TGA, amino acid, Azomethine, IR, NMR,

Azomethine amino ligands derived from the condensation of 3-methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acids (L-phenylalanine (P) and DL-tryptophan (T)) were synthesized. All ligands were analyzed by IR, 1H NMR, 13C NMR and their melting points. Interaction of the obtained azomethine amino ligands with metal salts produced novel nano sized Fe (II) and Cu (II) complexes. The isolated complexes ... Read more

CuFe2O4 nanoparticles: an efficient heterogeneous magnetically separable catalyst for synthesis of some novel propynyl-1H-imidazoles derivatives

2018-09-11 16:39:44 Keywords superparamagnetic materials, TEM, non-chromatographic methods, 5-Tetrasubstituted imida, recovered catalyst, efficient catalyst , Magnetic CuFe2O4 nanoparticles,

The non-toxic magnetic CuFe2O4 nanoparticles have been synthesized, characterized, and used as an efficient catalyst for synthesis of new derivatives for 1,2,4,5-tetrasubstituted imidazoles in excellent yields. The synthesized compounds work-up easy and purification of products are performed without chromatographic methods. The catalyst can be recovered for the subsequent reactions and reused without any appreciable loss. Read more

Hydrothermal preparation and characterization of ZnFe2O4 magnetic nanoparticles as catalyst for the synthesis of multi‐substituted imidazoles

2018-09-04 06:29:35 Keywords ZnFe 2O 4 nanoparticles, superparamagnetic materials, imidazoles, efficient catalyst , TEM, SEM, EDAX, XRD,

Nanoparticles are key focus of research for a wide range of novel applications. As such, ZnFe2O4 magnetic nanoparticles were synthesized hydrothermally and characterized via scanning and transmission electron microscopies, powder X‐ray diffraction, energy‐dispersive X‐ray and infrared spectroscopies, thermogravimetric analysis and magnetic measurements. They were used as a robust catalyst for the synthesis of a series of biologically active multi‐substituted imidazoles ... Read more

Electric, thermoelectric and magnetic characterization of γ-Fe2O3 and Co3O4 nanoparticles synthesized by facile thermal decomposition of metal-Schiff base complexes

2018-09-04 06:19:19 Keywords nanoparticles, XRD, IR, Magnetic Electric, Spinel, Co3O4, Fe2O3, TEM, Thermal Decomposition,

Using novel compounds for synthesis of metal oxide nanomaterials can tune their physical properties due to the associated variation in the shape, size and crystallinity. In this work, γ-Fe2O3 and Co3O4 nanoparticles were successfully prepared by a facile thermal decomposition route, employing [Fe(C32H22N4O2)]·2H2O and [Co(C16H11N3O4)].12">12H2O complexes, respectively as new precursors. The x-ray diffraction and high resolution transmission electron microscopy investigation ... Read more

Removal of Toxic Pb(II) Ions from Aqueous Solution by Nano Sized Flamboyant Pod (Delonix regia)

2018-09-11 15:35:36 Keywords TEM, XRD, Removal, Lead, Biosorbent, Kinetic parameters, Biosorption capacities, Delonix regia pod,

The removing of toxic heavy metals from aqueous solution by agricultural biosorbents was investigated by studying the effect of nano sized (Delonix regia) and chemically modified biosorbent citric acid Delonix regia (CADR) for removing of Pb2+ ions. TEM, XRD and EDS, FT-IR, SEM methods were used for characterizing the biosorbent(Delonix regia). The effect of contact time, pH,temperature, dosage of biosorbent, ... Read more

Effect of chromium substitution on the structural and magnetic properties of nanocrystalline zinc ferrite

2018-09-11 14:58:39 Keywords XRD, SEM, TEM, Nano structures, Chemical synthesis, EDAX, Rietveld analysis, Magnetometer,

Single-phase Cr doped zinc ferrites have been synthesized by hydrothermal method. The crystal structure, microstructure, crystallite size and distribution, composition and magnetic properties of the synthesized nanoparticles were determined using X-ray powder diffraction, electron microscopies and vibrating sample magnetometry. Powders are composed of ultrafine spherical nanoparticles with a highly homogeneous elemental composition. The nanoparticles have partially inversed cubic spinel structure ... Read more

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AddressBehind hospital of Sohag University - Ali Ebn Abi Taleb Street
Phone547500406
Fax934601159
Emailahmedabudief@science.sohag.edu.eg

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