Q.A. Drmosh

King Fahd University of Petroleum and Minerals, Az̧ Z̧ahrān, Eastern Province, Saudi Arabia

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Publications (12)18.02 Total impact

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    ABSTRACT: Zinc oxide (ZnO) thin film with an ultrathin layer of silver (Ag) atop was fabricated on glass substrate and a simple post-deposition annealing was carried out. A systematic observation was conducted to monitor morphological, structural and optical properties. The detailed morphological analysis by scanning electron microscope revealed that ZnO film surface became irregular with small pores dispersed all over the surface after the treatment, whereas the surface became smother with an ultrathin layer of Ag atop. Nucleation of Ag nanoparticles was observed initiated at the beginning of treatment. Preferential film orientation along c-axis with wurtzite hexagonal structure and a peak shift to red after treatment was confirmed by X-ray diffraction. Further investigation revealed that a stress relaxation from −0.51 GPa (compressive stress) to 0.58 GPa (tensile stress), grain growth from 13 to 31 nm and recrystallization with decreasing lattice constant (c) from 5.2655 to 5.1395 Å occurred after treatment. A reduction in optical band gap from 3.31 to 3.25 ± 0.01 eV was observed after the treatment with a slight increase in transmittance. At higher annealing temperatures, the weak photoluminescence emission did show blue shift from 367 to 364 nm and 362 nm. Elemental and compositional analysis was carried out by X-ray photoelectron spectroscopy. Such characteristics shift in structural and optical properties, in fact, plays a crucial role in determining device performances and overall efficiency.
    Journal of Materials Science Materials in Electronics 10/2014; · 1.49 Impact Factor
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    ABSTRACT: In this work, a simple two-steps process has been explained to fabricate silver (Ag) nanoparticles on Zinc Oxide (ZnO) thin film followed by their characterizations. The underneath layer ZnO thin film, as an example, was also investigated how the properties change during the course of nanoparticles fabrication. ZnO thin film was sputtered on standard glass substrate followed by further sputtering of an ultrathin Ag layer. Subsequently the specimen was treated at high temperature in inert environment. A periodic observation at specific temperature intervals confirmed the formation of Ag nanoparticles on ZnO thin film. Field-emission scanning electron microscopic (FESEM) observations revealed the size distribution of as-fabricated Ag nanoparticles in the range of 50-250 nm. Elemental analysis was also confirmed by SEM-aided energy dispersion spectroscopy. The underneath layer ZnO thin film was found to go through recrystallization, stress relaxation, and grain growth during the annealing process. Further treatment to ZnO only film showed a variation in surface topology with reference to those with Ag nanoparticles on ZnO. Such a system was also analysed with finite different time domain (FDTD) analysis. A typical model was considered and FDTD simulation was carried out to understand the trend of absorption depth profile within the absorbing layer involved in plasmonics solar cell.
    IOP Conference Series Materials Science and Engineering 08/2014; 64(1):012018.
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    ABSTRACT: We report structural and optical properties of Cu doped ZnO (ZnO:Cu) thin films deposited on glass substrate at room temperature by pulsed laser deposition (PLD) method without pre and post annealing contrary to all previous reports. For preparation of (ZnO:Cu) composites pure Zn and Cu targets in special geometrical arrangements were exposed to 248 nm radiations generated by KrF exciter laser. The laser energy was 200 mJ with 10 Hz frequency and 20 ns pulse width. The effect of Cu concentration on crystal structure, morphology, and optical properties were investigated by XRD, FESEM and photoluminescence spectrometer respectively. A systematic shift in ZnO (0 0 2) peak with Cu concentration observed in XRD spectra demonstrated that Cu ion has been incorporated in ZnO lattice. Uniform film with narrow size range grains were observed in FESEM images. The photoluminescence (PL) spectra measured at room temperature revealed a systematic red shift in ZnO emission peak and decrease in the band gap with the increase in Cu concentration. These results entail that PLD technique can be realized to deposit high quality crystalline ZnO and ZnO:Cu thin films without pre and post heat treatment which is normally practiced worldwide for such structures.
    Applied Surface Science 04/2013; 270:104–108. · 2.54 Impact Factor
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    ABSTRACT: Nanomaterials are of great interest due to their applications in many fields. The structural and efficacy of nano-materials depend strongly on the method applied for their synthesis. In this work, nanosized nickel oxide (NiO) particles were prepared by pulsed laser ablation (PLA) technique in 3% H2O2 aqueous solution The structural and optical properties of the NiO were investigated by X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscope (EDX), UV–Vis spectroscopy and Fourier-transform infrared spectroscopy (FT-IR). XRD analysis confirms that the phase is pure nickel oxide with lattice parameter = 0.42033 nm and 8 nm grain size while photoluminescence emission spectrum showed strong peak at 3.62 eV attributed to the band edge transition. FT-IR spectra depicts a strong band at ∼450 cm−1 which corresponds to the bending vibration of Ni–O bond. This work demonstrates that PLA is an effective method to control the size, impurity and minimal chemical waste generation which is the major problem with other wet chemical methods.
    Applied Surface Science 07/2012; 258(18):6982–6986. · 2.54 Impact Factor
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    ABSTRACT: Nano particles exhibit physical and chemical properties distinctively different from that of bulk due to high number of surface atoms, surface energy and surface area to volume ratio. Laser is a unique source of radiation and has been applied in the synthesis of nano structured metal oxides. The pulsed laser ablation (PLA) technique in liquid medium has been proven an effective and simple technique for preparing nanoparticles of high purity. Pulsed laser deposition (PLD) is another way to fabricate nano structured single crystal thin films of metal oxides. PLA technique has been applied in our laboratory for the growth of metal oxides such as nano-ZnO, nano-ZnO2 nano- SnO2, nano-Bi2O3, nano-NiO and nano-MnO2. Different techniques such as AFM, UV, FT-IR, PL and XRD were applied to characterize these materials. We will present our latest development in the growth of nano metal oxides using PLA and PLD.
    Proc SPIE 02/2011;
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    ABSTRACT: a b s t r a c t Multi-walled carbon nanotube/zinc oxide (MWCNT/ZnO) composites were synthesized by thermal hydrolysis method. The composites were prepared using multi-walled carbon nanotubes (MWCNTs) as a starting material, and zinc nitrate as a precursor. For characterization and morphological studies, different techniques such as FE-SEM, HRTEM, XRD, UV and FT-IR were applied. The photo catalytic activ-ity of the prepared composite was evaluated by measuring the degradation of acetaldehyde in aqueous solution under UV laser irradiation. Almost 50% enhancement in photocatalytic activity for removal of acetaldehyde was recorded by embedding ZnO nanoparticles on the surface of MWCNTs.
    Chemical Engineering Journal. 01/2011; 166:407-412.
  • Tawfik A Saleh, M A Gondal, Q A Drmosh
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    ABSTRACT: Nano-zinc oxide (n-ZnO) was loaded onto multi-walled carbon nanotubes (MWCNTs) via a hydrothermal process. Here pure n-ZnO used for loading was synthesized by the pulsed-laser ablation technique while MWCNTs were used as received. The synthesized MWCNT/ZnO nanocomposites were characterized using x-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy and Fourier transform infrared spectrometry. A model has been proposed for the structural nature of the alignment of ZnO on the surface of MWCNTs. The photocatalytic activity in the removal of highly toxic substances like cyanide (CN) was carried out in a special reactor using pulsed 355 nm UV generated by the third harmonic of an Nd:YAG laser. In order to understand the cyanide removal process, the study was carried out at different laser irradiation times, incident laser energies, pH of the solution and dosage of the MWCNT/ZnO nanocomposite. The study demonstrated that the CN removal process by MWCNT/ZnO composite has higher photocatalytic activity than pure n-ZnO and MWCNTs alone. The mechanism for the degradation using MWCNT/ZnO has been schematically explained. It was noticed that the oxidation process activity is affected by the pH of the solution, and after 20 min of UV laser irradiation, approximately 90% of CN had been degraded.
    Nanotechnology 11/2010; 21(49):495705. · 3.84 Impact Factor
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    M.A. Gondal, Q.A. Drmosh, T.A. Saleh
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    ABSTRACT: Many techniques are being developed for the synthesis of nano-structure ZnO which is extensively applied in many fields due to its unique properties. In present study, a pulsed laser ablation technique using 355 nm UV laser radiations generated by third harmonic of Nd:YAG laser was applied for synthesis of nano structured ZnO for hydrogen generation by water splitting, waste water and degradation of dyes for clean water supplies. A disk of high purity zinc target was fixed at the bottom of a glass cell and irradiated by laser to produce ZnO<sub align="right"> 2 </sub> nano particles which was further converted into ZnO nano particles by annealing at different temperatures. The nanoparticles were characterised by X-ray diffraction (XRD), photoluminescence (PL), and Raman spectroscopy techniques. The dependence of the structural and optical properties on annealing temperature was studied. It is worth mentioning that not only the grain size was changed with annealing temperature but the lattice parameters 'a' and 'c' were also altered which has not been reported in open literature.
    Int. J. of Nanoparticles. 01/2010; 3(3):257 - 266.
  • M.A. Gondal, Q.A. Drmosh, T.A. Saleh
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    ABSTRACT: Tin dioxide (SnO2) nanoparticles having 3 nm size were synthesized by irradiating pure tin metal using high power Nd:YAG laser in deionized water. Formation of nano-SnO2 crystallites was confirmed by X-ray diffraction (XRD) and AFM study. UV–vis absorption spectral studies showed a peak at 240 nm. FTIR spectrum showed a band in the range of 400–700 cm−1 which was assigned to Sn–O antisymmetric vibrations. Photoluminescence spectrum of synthesized SnO2 nanoparticles showed peak corresponding to 3.175, 2.901 and 2.613 eV respectively.
    Applied Surface Science 01/2010; · 2.54 Impact Factor
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    ABSTRACT: Zinc peroxide nanoparticles having grain size less than 5 nm were synthesized using pulsed laser ablation in aqueous solution in the presence of different surfactants and solid zinc target in 3% H2O2. The effect of surfactants on the optical and structure of ZnO2 was studied by applying different spectroscopic techniques. Structural properties and grain size of the synthesized nanoparticles were studied using XRD method. The presence of the cubic phase of zinc peroxide in all samples was confirmed with XRD, and the grain sizes were 4.7, 3.7, 3.3 and 2.8 nm in pure H2O2, and H2O2 mixed with SDS, CTAB and OGM respectively. For optical characterization, FTIR transmittance spectra of ZnO2 nanoparticles prepared with and without surfactants show a characteristic ZnO2 absorption at 435–445 cm−1. FTIR spectrum revealed that the adsorbed surfactants on zinc peroxide disappeared in case of CTAB and OGM while it appears in case of SDS. This could be due to high critical micelles SDS concentration comparing with others which is attributed to the adsorption anionic nature of this surfactant. Both FTIR and UV–vis spectra show a red shift in the presence of SDS and blue shift in the presence of CTAB and OGM. The blue shift in the absorption edge indicates the quantum confinement property of nanoparticles. The zinc peroxide nanoparticles prepared in additives-free media was also characterized by Raman spectra which show the characteristic peaks at 830–840 and 420–440 cm−1.
    Applied Surface Science 01/2010; · 2.54 Impact Factor
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    ABSTRACT: A pulsed laser emitting UV radiations generated by the third harmonic of Nd:YAG was applied for the synthesis of nano-structured ZnO2 and ZnO. For the synthesis of nanoparticles of ZnO2, a high-purity metallic plate of Zn target was fixed at the bottom of a glass cell, in the presence of deionized water mixed with oxidizing agent H2O2, under repeated laser irradiation. The optical properties, size and the morphology of the synthesized ZnO2 and ZnO by laser ablation was influenced strongly by post-annealing conditions which is not previously reported. By annealing ZnO2 at 200 °C for 8 h, the product (ZnO2) synthesized primarily was converted completely to ZnO. By variation of the annealing temperatures from 200 to 600 °C, the grain size of ZnO changes from 5 to 19 nm with a change in lattice parameters, the band gap and some other optical properties of nano-ZnO.
    Applied Surface Science 01/2009; · 2.54 Impact Factor
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    ABSTRACT: A laser-based method was developed for synthesis of nanostructured ZnO/ZnO<sub align="right">2</sub> using nanosecond pulsed laser ablation (PLA) on a metallic zinc target in water. Typical laser pulse energy for PLA process was between 40-130 milli-joules per pulse. The addition of an oxidising agent enhanced the nanoparticle yield by 100% and reduced the grain size drastically. A variety of analysis techniques were applied for the characterisation of products. To the best of our knowledge, this is the first time ZnO<sub align="right">2</sub> (zinc peroxide) having grain size of 5 nm are produced using laser ablation.
    Int. J. of Nanoparticles. 01/2009; 2(1/2/3/4/5/6):119-128.

Publication Stats

58 Citations
18.02 Total Impact Points

Institutions

  • 2009–2014
    • King Fahd University of Petroleum and Minerals
      • • Center of Research Excellence in Nanotechnology
      • • Department of Mechanical Engineering
      • • Department of Physics
      • • Department of Chemistry
      Az̧ Z̧ahrān, Eastern Province, Saudi Arabia