Prof. Farid Mahmoud El-Tantawy

Suez Canal University · Head of Department of Physics - Ismailia - Egypt

Synthesis of graphene doped silicon nanoparticles is important for many applications such as energy storage materials for lithium ion batteries and super capacitors. In this letter, we provide a simple, cost effective, and scalable thermal method to get a uniformly distributed spherical silicon nanoparticles within reduced graphene oxide. The distr...

The fabrication and photoelectrical properties of the photodiodes based on the ternary alloy of semiconductor nanocrystallite Pb0.9Cd0.1S with coumarin dopant were investigated. The structure, stability, melting temperature and optical bandgap of the prepared nanostructure were characterized by X-ray diffraction, thermogravimetric analysis, Infrare...

To prepare phosphotungstic acid (PTA) thin film was used drop-coating method. The film was dropped on p-Si having ohmic contact. The electrical and photovoltaic properties the fabricated Al/p-Si/phospotungstic acid(PTA)/Al photodiode were investigated. The current-voltage (I-V) measurements were carried out under dark and various illumination inten...

Coumarin doped with poly(3-hexylthiophene)/p-Si photodiodes were prepared by the drop-casting technique. The currentevoltage characteristics of the prepared diodes with the structure of Al/ P3HT:Coumarin/p-Si/Al diodes were investigated under dark and various illumination intensities using both IeV and CeV methods. Using both illuminated DC and tra...

In this study, the phosphotungstic acid /p-Si diode was fabricated by a drop coating method. The fabricated diode had excellent rectifying properties. The electrical properties of the diode were investigated in the temperature range of 50-400 K. The optical band gap of the phosphotungstic acid film was determined and found to be 3.66 eV. The electr...

Herein, the successful synthesis of bismuth trioxide (Bi2O3) nanorods via a new microwave-assisted hydrothermal technique is reported. Detailed characterizations for the prepared nanorods employing various analytical techniques were considered for their structural, compositional, morphological, optical and photocatalytic properties. The detailed re...

The present study introduces cyclotriphosphazene compounds substituted by dioxyphenylcoumarin as a photodiode application. Firstly, 7,8-dihydroxy-3-(3-methylphenyl)coumarin (1b) has been obtained by conventional as well as microwave assisted methods. Novel optoelectronic device characteristics for both mono and disubstituted dioxyphenylcoumarin bea...

The two complexes containing 2,6-bis(benzimidazol-2-yl)pyridine and 2-pyridine and 2-quinoline carboxylates were synthesized to fabricate organic photodiodes. The electrical properties of complex and complex diodes were investigated by current-voltage and capacitance-voltage measurements. The fabricated devices give a high rectification behavior wi...

The graphene oxide (GO) nanosheets doped poly(vinylidene fluoride) (PVDF) nanocomposites were successfully fabricated using the solution blending. The structural properties of the PVDF/GO nanocomposites were investigated using the field emission scanning electron microscopy (FESEM) and transmission electron microscopy (SEM) techniques. The surface...

High purity ruthenium dioxide (RuO2) nanoparticles with the average size is about 9 nm in diameter are readily synthesized through a low cost sol–gel method. RuO2 thin films have been deposited on SiO2 substrates by sol–gel spin coating techniques at room temperature, followed by annealing at 500 °C for 2 h. The result of X-ray diffraction indicate...

Drop casting deposition technique was used to fabricate graphene oxide doped methylene blue (GO doped MB) photodiode, Al/p-Si/GO doped MB/Au. The effects of illumination on the current–voltage (I–V) characteristics of the Al/p-Si/GO doped MB/Au Schottky diode for optical sensing applications were explored. The reverse current of the diode in the re...

A CuFeO2 film was prepared on p-type silicon wafer to fabricate an Al/CuFeO2/p-Si/Al diode by the sol–gel method. The temperature and frequency dependence of electrical characteristics of Al/CuFeO2/p-Si/Al diode were investigated using current–voltage (I–V) and capacitance/conductance–voltage (C/G–V) measurements. It is found that the ideality fact...

The CdSe quantum dots were deposited on p type Si(100) substrate by spin coating process. CdSe quantum dots were selected as the interlayer to reduce the reverse-bias leakage current of heterojunction. Various junction parameters were determined from the current-voltage (I–V) and capacitance-voltage (C–V) characteristics. Au/CdSe quantum dots/p-Si...

The interface states and series resistance properties of the Al/FeO-Al2O3/p-Si diode were investigated by the capacitance (C) and conductance (G) measurements. The measured capacitance and conductance values were corrected to eliminate the effect of series resistance to obtain the real capacitance and conductance values of the diode. The C and G ch...

The device parameters of Al/p-Si/Zn1-xAlxO-NiO/Al Schottky diode for x=0.005 were investigated over the 50K to 400K temperature range using direct current–voltage (I–V) and impedance spectroscopy. The films were prepared using the sol-gel method followed by spin-coating on p-Si substrate. The ideality factor, barrier height, resistance and capacita...

One step and facile synthesis of SnO 2 doped graphene oxide (GO) nanoparticles were conducted by applying a new doping method based on modified Hummer method. The structural and thermal behavior were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and thermal g...

Here, we report, for the first time, synthesis of Cu-doped GaN nanorods by a simple sol–gel approach in the absence of any catalyst. The morphology of the as-synthesized Cu-doped GaN nanorods was examined in terms of X-ray diffraction, field emission scanning electron microscopy, high-resolution scanning electron microscopy and energy-dispersive X-...

The modern advances in portable and flexible electronic devices require integration of flexibility into future electromagnetic interference shielding nanocomposites. Lightweight and flexible acrylonitrile butadiene rubber/graphene nanosheets (NBR/GN) nanocomposites were fabricated using conventional rubber – roll milling technique. The surface morp...

Sn–9Zn lead-free solders possess remarkable potential as candidates for low temperature electronic applications. In this study, it is proposed to utilize the advantages of Bi alloying and reducing the amount of Zn to improve oxidation resistance and reliability of eutectic Sn–9Zn solder. The results indicate that hypoeutectic Sn–6.5Zn alloy compose...

Sn–9Zn lead-free solders possess remarkable potential as candidates for low temperature electronic applications. In this study, it is proposed to utilize the advantages of Bi alloying and reducing the amount of Zn to improve oxidation resistance and reliability of eutectic Sn– 9Zn solder. The results indicate that hypoeutectic Sn– 6.5Zn alloy...

Large quantities of gallium nitride (GaN) nanoparticles were successfully synthesized via a facile sol-gel approach. X-ray diffraction analysis confirms the polycrystalline nature of the GaN with hexagonal wurtzite structure and lattice constants a = 0.3189 nm and c = 0.5185 nm. The morphology of the GaN film was investigated by field emission scan...

The films of Zn1−x Alx O:NiO (AZO; Al/Zn = 1.5 at.%, x = 0.5–2.0) were synthesized on glass substrates by sol–gel method. The morphological properties of the films were studied by atomic force microscopy. The surface morphology of the films is found to depend on the concentration of NiO. The optical band gap, Urbach energy and optical constants suc...

A novel functional nanocomposites microwave shielding material using natural rubber (NR) loaded with binary active fillers barium hexaferrite (BF) (BaFe12O19) and carbon nanoparticle (CB) were fabricated by conventional roll milling technique. Nanocrystalline barium hexaferrite with particle size of 16 nm were successfully synthesized by hydrotherm...

A novel photodetector of Al/GO:C8-BTBT/n-Si/Au with various graphene oxide (GO) contents has been investigated. The electrical properties of the diodes were characterized by current-voltage (I-V) and capacitance-voltage (C-V) measurements. The values of barrier height, ideality factor, and series resistance of the diodes were determined from I-V ch...

Nanocrystalline of Cu2O thin film was synthesized by sol–gel spin-coating technique. The spectrophotometric characteristics of transmission and reflection were studied for the film deposited on glass substrate. The optical absorption measurements near the absorption edge indicate that the absorption mechanism is due to allowed direct transition wit...

Au/reduced graphene:poly(3-hexylthiophene) (P3HT) nanocomposite/p-Si/Al diodes have been prepared and their electrical characteristics have been investigated using current–voltage, capacitance–voltage and conductance–voltage measurements. The electronic parameters such as ideality factor (n) and barrier height ($$\Phi _{\mathrm{B}0})$$ΦB0) were det...

Abstract Novel flower-like hierarchical nanostructures consisting of Mgx Zn1−x O semiconductors were successfully synthesized by the hydrothermal technique. X-ray diffraction results indicate that the Mgx Zn1−x O (x = 0-0.25 at %) samples are single hexagonal phase. The grain morphology and spatial compositions of Mgx Zn1−x O nanoflowers were syste...

Recently, wide band-gap III-Nirtride (III-N) materials and its alloys have attracted much research due to its unique properties and diverse field of applications. In the present study, GaN with various concentration of iron (Fe) in the range 0-5 at% nanostructures were prepared by facile solution process using (Ga(NO3)3·9H2O), iron (III) chloride h...

The electrical and optical properties of carbon nanotubes hybrid zinc oxide (ZnO-CNTs) nanocomposites synthesized by ball mill technique have been investigated. The nanocomposites were prepared using zinc oxide powder and carbon nanotube synthesized by catalytic thermal chemical vapor deposition (CVD). The diameters and lengths of the carbon nanotu...

Lithium-zinc-tin-oxide thin films were prepared by sol gel method. The structural and optical properties of the films were investigated. The optical band gaps of the LiZnSnO films were found to be 3.78 eV for 0 at.% Li, 3.77 eV for 1 at.% Li, 3.87 eV for 3 at.% Li and 3.85 eV for 5 at.% Li, respectively. Au/LiZnSnO/p-Si/Al photodiodes were fabricat...

We report the synthesis and the characterization of organic thin film transistor based on pentacene presenting SiO2 dielectric layer deposed by sol–gel method. The texture of the obtained layers was analyzed by atomic force microscopy technique. The results show that all electric parameters in static and dynamic regimes depend on the morphology of...

For the first time, the polyvinyl alcohol: graphene oxide nanocomposite films for various contents of graphene oxide nanosheets were prepared by spin coating method. The synthesized GO nanosheets and PVA/GO nanocomposites were characterized using field emission scanning electron microscope (FETEM) technique and energy dispersive X-ray spectroscopy...

Novel Schottky photodiode based on Al/p-Si/Li0.3V2O5/Au thin films have been successfully fabricated by sol–gel spin coating approach. The as-prepared films were characterized by X-ray diffraction (X-ray), Fourier transformed infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS) and atomic force microscopy (AFM). The diameters of...

Transition-metal-doped ZnO is considered a promising candidate for applications in spintronics. Thin films of ZnO at different Lanthanum (La) doping concentration varied from 1 to 4 wt% have been synthesized via a new facile sol–gel route using the spin coating approach. X-ray diffraction patterns of the films showed that the pure ZnO and La-doped...

The octylcyanobiphenyl (8CB) liquid crystal was doped by ZnO nanoparticles to improve the dielectric anisotropy parameters, as the image quality of liquid crystal displays (LCDs) is strongly dependent on the dielectric anisotropy of the liquid crystal. The dielectric anisotropy parameters of the liquid crystals have been determined. The magnitude o...

We synthesized CuGaO2 film by sol gel method to prepare a photodiode of p-Si/CuGaO2. The structural properties of the CuGaO2 film were investigated using atomic force microscope (AFM). The optical band gap of the CuGaO2 film was found to be 3.64 eV. The photoresponse characteristics indicate that the diode exhibits a photoconducting behavior. The p...

The nickel oxide nanoparticles were synthesized by sol gel method to improve the properties of nematic octylcyanobiphenyl (8CB) liquid crystal. Dielectric and electrical properties of nematic octylcyanobiphenyl (8CB) liquid crystal doped with nickel oxide nanoparticles (DNPs) have been investigated. The dielectric anisotropy parameters have shown a...

Nano-structured graphene oxide (GO) freestanding paper was synthesized by an arc recharge technique in flowing of oxygen for the first time. This technique offers new ways on how e.g. layers structure nanomaterials could be produced. The morphology and structural properties of the as-synthesized GO were examined by means of X-ray diffraction, Fouri...

A new Schottky diode (InFe2O4/p-Si/Al) was fabricated using the sol–gel spin coating technique. The current–voltage (I–V) characteristics of the Schottky diode were investigated under various illumination intensities. The value of ideality factor (n) and zero-bias barrier height (ΦB0) for all illuminations was determined by using the forward-bias I...

The optical properties of the CdO and Pt doped CdO thin films synthesized by sol-gel technique were investigated. The lowest grain size value (81.34 nm) was found to be for CdO thin film. The Pt doped CdO films are transformed to clusters with nanoparticles. The transparency properties of the CdO thin film is changed with Pt doping. The plots of re...

ZnO nanotubes with the wurtzite structure have been successfully synthesized via simple hydrothermal solution route using zinc nitrate, urea and KOH for the first time. The structural, compositions and morphology architectures of the as synthesized ZnO nanotubes was performed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (F...

Nanocrystalline tungsten oxide (WO3) has unique properties and immense application potential toward nanodevice fabrication. The WO3 nanorods were successfully synthesized via a facile hydrothermal reaction technique at low temperature using phosphotungstic acid and urea for the first time. This method provides a fast, simple, low cost and green lar...

Al/Cd0.4ZnO0.6/p-Si Schottky photodiode was successfully fabricated via sol–gel process. The current–voltage characteristics of the diode were performed in dark and illumination conditions. The electronic parameters of the diode were determined using the thermionic emission theory. The values of ideality factor (n) and barrier height (ΦB0) values o...

In this work, we have systematically investigated the effects of illumination intensity on the electrical characteristics of GaFeO3/p-Si heterostructure. The current-voltage (I-V) measurements of the heterostructure based on GaFeO3 thin film were performed in dark and under different illumination intensities. The photocurrent in the reverse biased...

Novel magnesium oxide (MgO) nanobelt structures were successfully synthesized on a large scale, low cost and catalyst free by a microwave hydrothermal route using the magnesium metal and potassium hydroxide precursors at 200 °C for 10 min. The synthesized MgO nanobelts were systemically characterized by power X-ray diffraction (XRD), scanning elect...

A novel conducting polyvinyl alcohol (PVA) reinforced silver (Ag) nanoparticles were successfully synthesized for electromagnetic wave shielding at microwave frequency. The microstructures of the nanocomposites were examined by means of X-ray diffraction, field-emission scanning electron microscope and transmission scanning microscopy. Mechanical a...

In this study, the influence of carbon nanotubes (CNT) in concentrations from 2 to 10 phr on the dielectric (dielectric permittivity, dielectric loss angle tangent) and microwave (reflection coefficient, attenuation coefficient, shielding effectiveness) properties of nanocomposites on the basis of natural rubber has been investigated in the wide fr...

In this study, the influence of fullerenes in concentrations from 0.5 to 1.5 phr on the dielectric (dielectric permittivity, dielectric loss angle tangent) and microwave (reflection coefficient, attenuation coefficient, shielding effectiveness) properties of nanocomposites on the basis of natural rubber has been investigated in the 1-12 GHz frequen...

A new kind of p-type Schottky diode was successfully fabricated based entirely on Al/NiAl2O4/p-Si/Al spinel using the sol–gel spin coating approach. The estimated values of particle size and surface roughness of the as prepared NiAl2O4 film are found to be 168–362 nm and 27.735 nm, respectively. The electrical properties of the Al/NiAl2O4/p-Si/Al d...