Seham KamalCairo University | CU · faculty of science
Seham Kamal
Ph D
Organic-inorganic hybrid perovskites
Graphene nanocomposites
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45
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March 2002 - November 2015
Publications
Publications (45)
Hybrid perovskite crystals NH3(CH2)nNH3MCl4 (M: Co, Mn, and n = 4, 5, 9), abbreviated CnMCl studied elswhere are investigated in terms of structural analysis, DSC, Infrared, and UV-visible spectroscopy properties. The structures of these salts are compared in terms of parametrs and space groups relationship symmetry. BFDH (Bravais-Fridel, Donnay–Ha...
Organic- inorganic hybrid perovskites gain considerable attention recently and more studies have been done as changing the halide, metal ion and the ligand enables to tune the optical, electric, magnetic, ferroelectric properties. Halide perovskites in particular lead halides are interesting semiconductors with a direct band gap (1.5 eV) which enab...
Single crystals of bis(1,2-diaminepropane) di-μ-chloro-bis[diaquadichloromanganate(II)] dichloride have been prepared by evaporation from ethanoic solution. The triclinic X-ray crystal structure is built as layers of centrosymmetric dimers of [Mn(Cl)4(H2O)2]²⁻ octahedra and 1,2-diaminopropane. The inorganic part consists of Mn octahedra shar...
Three 2D hybrid perovskite materials based on long chain diammonium NH3(CH2)9NH3MCl4 (M: Mn, Co, Cu) were prepared and characterized. The single crystal X-ray diffraction analysis showed that the novel compound NH3(CH2)9NH3MnCl4 (denoted C9Mn) crystallized in the monoclinic P21/c (Z=4) with the unit cell parameters a=7.405(3) Å, b=7.102(3) Å, c=29....
Rice straw nanofibers (RSNF) with high lignin content were used in making nanocomposites with graphene oxide (GO) at loading ratios from 0.625% to 5% (based on weight of RSNF). The prepared RSNF/GO films were characterized regarding their tensile strength, equilibrium moisture content (EMC), and electrical properties. Microstructure of the films wa...
Layered 2D organic-inorganic hybrid perovskite (OIHs) of the diammonium series, 1,5 di-aminepentane tetrachloro manganate NH3(CH2)5NH3MnCl4 denoted C5MnCl and 1,6 di-aminhexane tetrachloro manganate NH3(CH2)6NH3MnCl4 (C6MnCl) were prepared by slow evaporation method, and structurally characterized by single crystal X-ray diffraction analysis. The C...
Organic-inorganic hybrid perovskites NH3(CH2)nNH3CoCl4 (n = 4, 9) single crystals are prepared by solution precipitation method. Single crystal X-ray diffractions are performed. Both compounds crystallized in the centrosymmetric triclinic P-1 (Z=2) space group; the determined parametrs for the novel salt NH3(CH2)9NH3CoCl4 are: a=7.3113(4) Å, b=10.2...
Single crystals of two organic-inorganic hybrid (OIH) perovskites containing 1,5 pentylenediammonium, [NH3-(CH2)5–NH3] MnCl3.47Br0.53 (C5MnCB) and [NH3-(CH2)5–NH3] CoCl2.72Br1.28 (C5CoCB) were grown from solution by evaporation. The structure is investigated by single crystal x-ray diffraction, and infrared and Raman spectroscopy is used to help pr...
In the present work, graphene oxide GO is prepared by chemical exfoliation of graphite using Hummer’s method. A facile and green synthesis of ZnO–rGO nanocomposite is performed using aloe vera plant extract. The characterization tools (XRD, FTIR, FESEM, HrTEM, AFM) proved the formation of single phase of ZnO–rGO nanocomposite. Since the environment...
Organic‐inorganic hybrid perovskites (OIHs) are exceptionally promising sector of novel materials for optoelectronic applications. In this work, the OIHs of the formula [(NH3)2(CH2)3]CuCl4 labeled by C3CuCl and [(NH3)2(CH2)4]CuCl2Br2 labeled by C4CuClBr are prepared by slow evaporation method. The synthesis process is achieved by mixing equimolar e...
In the present work graphene nanocomposite of CuO‐rGO was synthesized by simple precipitation reaction. Characterization by different techniques confirms the reduction of graphene oxide and formation of CuO‐rGO. The CuO nanocrystals are uniformly distributed on graphene sheets. Neutron and X‐ray diffraction prove the formation of single phase of Cu...
In the present work graphene oxide GO prepared by chemical exifliation of graphite using Hummer’s method. A facile and green synthesis of ZnO-rGO nanocomposite was performed via Alovera plant extract. The characterization tools (XRD-FTIR- FESEM-TEM- AFM) proved the formation of single phase of ZnO-rGO nanocomposite . Since the environmental contami...
Whereas ferric oxide particles are common catalyst for energetic oxidizers such as ammonium perchlorate (APC), reduced graphene oxide (RGO) with superior thermal conductivity as well as high interfacial surface area could be candidate substrate for advanced catalytic systems. This study reports on the facile synthesis of RGO-Fe2O3 nanocomposite as...
Perovskite-graphene nanocomposites of rare-earth LaFeO3-rGO and LaFeO3 nanoparticles are synthesized and characterized. The preparation was done by citrate sol-gel method. The structural characterization has been performed using XRD and FT-IR. Scanning electron microscope (SEM) and atomic force microscope (AFM) were used to analyze the morphology o...
We present an experimental and theoretical study of the perovskite-graphene nanocomposites LaFeO3 – rGO, where we demonstrate a easy way to prepare this compound using citrate auto-compulsion method, starting from corresponding metal nitrate and graphene oxide solution. The Hummer’s method was used to prepare graphene oxide by chemical exfoliation...
![Figure 5. diffused reflectance of [NH 3 (CH 2 ) 3 NH 3 ]BiCl 5, the...](publication/336450403/figure/fig2/AS:813019760177152@1570850424917/diffused-reflectance-of-NH-3-CH-2-3-NH-3-BiCl-5-the-inset-fig-represent-the-band_Q320.jpg)
![The H-bond geometry of hybrid perovskite [(NH 3 ) 2 (CH 2 ) 3 ]BiCl 5 ,...](publication/336450403/figure/tbl1/AS:813019760173057@1570850424951/The-H-bond-geometry-of-hybrid-perovskite-NH-3-2-CH-2-3-BiCl-5-Donner-atom-D-N_Q320.jpg)
In the pages that follow,the structure of the crystal, unit cell dimension and complete structure information will be shown by single crystal x-ray diffraction and measuring some physical properties of 1D propylene diammonium pentachloro bismuthate [(NH 3 ) 2 (CH 2 ) 3 ]BiCl 5 organic-inorganic hybrid perovskites (OIHs).Slow evaporation method is u...
In this work the crystal structure by single crystal X-ray measurement and optical properties of 1D propane-1,2-diammonium pentachlorobismuthate [NH 3 CH 2 CH(NH 3 )CH 3 ]BiCl 5 organic–inorganic hybrid perovskite are presented. It is prepared by mixing ethanolic solution of equimolar ratios (1:1) of its basic components. The title compound crystal...
In this work, facile synthesis of Mn3O4-reduced graphene oxide (Mn3O4-rGO nanocomposite is presented, in which the reduction of graphene oxide and the nucleation of Mn3O4 on the graphene sheet occur simultaneously with the aid of hydrazine hydrate followed by heat treatment of the precipitate at 400°C in air. The characterization tools prove the fo...
![Fig. 5 diffused reflectance of [NH3(CH2)3NH3]BiCl5, the inset fig...](profile/H-Ayoub/publication/332353029/figure/fig2/AS:746547759312896@1555002264788/diffused-reflectance-of-NH3CH23NH3BiCl5-the-inset-fig-represent-the-band-gap-energy_Q320.jpg)
In the pages that follow ,the structure of the crystal , unit cell dimension and complete structure information will be shown by single crystal x-ray diffraction and measuring some physical properties of 1D propylene diammonium pentachloro bismuthate [(NH3)2(CH2)3]BiCl5 organic-inorganic hybrid perovskites (OIHs).Slow evaporation method is used to...
The 2-D organic–inorganic hybrid perovskites of the formula [(NH3)(CH2)7(NH3)]CuClxBr4−x, x = 0, 2 and 4 were prepared by slow evaporation from ethanolic solution in stoichiometric ratio 1:1 (organic/inorganic). Microchemical analysis and x-ray diffraction (XRD) were used to confirm the formation of the presently investigated hybrids. Differential...
Hummer’s method was used to prepare graphene oxide (GO) by chemical exfoliation of graphite. Simple precipitation method was used for the preparation of hybrid nanocomposites MgO–rGO and Fe2O3–rGO. A 0.3 Molar of corresponding metal nitrate solution and GO solution are used for the preparation process. XRD, FT-IR, and XPS were used to characterize...
[(CH2)7(NH3)2]CoCl4 crystallizes in the triclinic system, space group P-1 with two molecules per asymmetric unit cell (Z = 2). The unit cell dimensions are a = 7.3107 (2) Å b = 10.1841 (3) Å c = 11.2690 (4) Å α = 66.81 (2), β = 78.85 (12), and γ = 87.66 (2). The unit cell volume and the calculated density are 756.11 (4) ų and 1.463 Mg m⁻³, respect...
In the present study, morphology, size distribution, and magnetic properties of magnesium/potassium nano ferrite samples with the chemical formula Mg0.5+x K1−2xFe2O4; 0 ≤ x ≤ 0.35 have been reported. The X-ray diffraction analysis of the studied samples confirms the formation of single phase cubic spinel structure. This phase is prepared with Mg–K/...
Layered 2D organic–inorganic hybrid perovskite (OIHS) of the diammonium series, 1,5 di-aminepentane tetrachloro mangenate ([NH3–(CH2)5–NH3] MnCl4) was prepared by slow evaporation and reducing temperature method and characterized by single crystal X-ray diffraction analysis. Its structure consists of organic cation, [NH3(CH2)5NH3]⁺² extended in a z...
![XRD pattern of [NH3(CH2)nNH3]CuCl4, n = 7, 9 denoted 2CnCuCl and 2C7CuCB](publication/318594190/figure/fig2/AS:779414098964482@1562838210420/XRD-pattern-of-NH3CH2nNH3CuCl4-n7-9-denoted-2CnCuCl-and-2C7CuCB_Q320.jpg)
![a, b optical absorbance spectra of [(NH3)(CH2)n(NH3)]CuCl4, n = 6,7,9...](publication/318594190/figure/fig5/AS:779414098944017@1562838210843/a-b-optical-absorbance-spectra-of-NH3CH2nNH3CuCl4-n6-7-9-and_Q320.jpg)
Diammonium series of Cu hybrid perovskites of the formula [(NH3)(CH2)n(NH3)]CuCl4, n = 6–9 are prepared from an ethanolic solution in stoichiometric ratio 1:1 (organic/inorganic). Formation of the desired material was confirmed and characterizes by microchemical analysis, FTIR, XRD and XPS spectra. The structure consists of corner-shared octahedron...
[(CH2)7(NH3)2]CoBr4, triclinic crystal has a space group P with two molecules per asymmetric unit cell (Z = 2). Unit cell dimensions are: a = 7.6588 (3) Å, b = 10.5160 (3) Å, c = 11.3319 (5) Å, α = 66.745 (2) °, β = 77.2258 (13) °, γ = 88.001 (2) °, volume = 816.37(5) ų and calculated density = 2.078 Mgm⁻³. The structure consists of [CoBr4]²⁻tetra...
The layered organic-inorganic hybrid of [NH3-(CH2)7-NH3]CaCl2Br2 has been synthesized from ethanolic solution by gradual cooling to room temperature. The reaction molar ratio is (1:1) organic/inorganic. Formation of the hybrid was confirmed by microchemical analysis, FTIR, and XRD. Thermal analysis DSC shows four transitions associated with solid–s...
Anew organic-inorganic 2Dhybrid perovskite [NH3(CH2)4NH3]CoCl4,1,4butane diammonium tetra-chlorocobaltate, has been synthesized. Blue prismatic single crystals were grown from ethanolic solution in 1:1stoichiometric ratio (organic/inorganic) by gradual cooling to room temperature after heating at 70 °Cfor 1 hour.The hybrid crystallizes in a triclin...
The fundamental question in nano-technology is ”Why nano-material properties differ than bulk one?” and the answer is associated by phonons interaction in small amount of atoms. This question will not be solved unless the atomic vibration motion of molecules is being determined. In this work, an attempt to solve some simple molecules (H2O and NH3)...
Recently a great deal of attention has been devoted to preparation and characterization of graphene and hybrids based on graphene sheets. The physical and chemical properties of functionalized graphene nanocomposites could be tailored according to the various applications (energetic, environmental and technological) for example, solar and fuel cell...
Synthesis, crystal structure, IR spectroscopy and thermal properties of layered organic-inorganic 2D perovskite hybrid [NH3(CH2)5NH3]MnCl4; 1,5 di-ammonium- pentane tetrachloro mangenate
Seham K. Abdel-Aal, Ahmed S. Abdel-Rahman
Physics department, Faculty of Science, Cairo University
Corresponding Author email seham@sci.cu.edu.eg
Abstract
Organic–...
Synthesis, characterization and phase transition of 2-D organic-inorganic perovskite hybrid of [NH3-(CH2)7-NH3]CuCl4
1,7 diaminoheptan tetrachloro-cupperate
S.K. Abdel-Aal
Physics department, Faculty of Science, Cairo University
Abstract
Organic–inorganic hybrids (OIHs) materials enable the combination of useful organic and inorganic character...
Synthesis and structure of perovskite organic-inorganic hybrid of [NH3(CH2)4NH3CoCl4] 1,4 butane diammonium tetrachlorocobaltate
Seham Kamal. Abdel-Aal
, Physics Department, Faculty of Science, Cairo University, Egypt.
Correspondence e-mail: seham@sci.cu.edu.eg
A new organic-inorganic hybrid [NH3(CH2)4NH3]CoCl4, 1,4 butane diammonium tetra-chloro...
Crystal and molecular structure of organic -inorganic hybrid of C5H16N2MnCl4 view along 001 plan
Manganese diammonium hybrid [(CH2)7(NH3)2]MnCl4, Organic-inorganic hybrid perovskites is studied by X-ray, thermal and impedance spectroscopy. The obtained lattice parameters are
a (Å) b (Å) c (Å) (º) β (º) (º) V (Å 3)
6.81 7.89 14.72 63.46 67.20 57.11 584.2
The DSC thermograph of the hybrid (scanning rate of 100C/min.) between 250 K and 400...
photo from cif file by Hg programm
Abstract: 1,7-Heptanediammonium-dichlorodibromo-cobaltate (II), with molecular formula [(CH2)7(NH3)2]CoCl2Br2,
has been synthesized. It is triclinic P�1, a = 7.4042 (4) A ° , b = 10.3484 (5) A ° , c = 11.3554 (6) A ° , a = 66.289 (3)�
b = 78.425 (2)�, c = 86.546 (3)�. Its crystal structure contains distorted tetrahedral [CoCl2Br2]2- anions and zigz...
Questions
Questions (2)
Dear Colleagues could any one tell me the difference between ferroelectric and Electret ?
Dear college, while I was measuring polarization Vs electric field (Hysteresis loop measurement) at different temperature for organic -inorganic hybrid material of the formula (NH3 (CH2)n NH3 MX4 at high temperature I obtain a saturated Hysteresis loop (as seen in the attached file) resemble for ferroelectric material, the thermal results shows an endothermic peak at that high temperature where the saturated hys loop occurs, is that a ferroelectric liquid crystalline phase it occurs before melting the sample could I contact with professor or doctor specialized in liquid crystal to discuss the data. ?
