A5103250893- Carbon Nanotubes in Composites
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Silicon Nanostructures and Photoluminescence
- Advanced Condensed Matter Physics
- Fullerene Chemistry and Applications
- Superconductivity in MgB2 and Alloys
- Thin-Film Transistor Technologies
- Adsorption and biosorption for pollutant removal
- Electrocatalysts for Energy Conversion
- Advancements in Battery Materials
- Iron-based superconductors research
- Aluminum Alloys Composites Properties
- Boron and Carbon Nanomaterials Research
- Catalytic Processes in Materials Science
- Microwave Dielectric Ceramics Synthesis
- High-pressure geophysics and materials
- Metal-Organic Frameworks: Synthesis and Applications
- Magnetic Properties and Synthesis of Ferrites
- Nanomaterials for catalytic reactions
- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Electrochemical Analysis and Applications
- Ferroelectric and Piezoelectric Materials
Jamia Millia Islamia
2020-2025
International Islamic University, Islamabad
2011-2024
King Saud University
2024
Riphah International University
2020-2024
Helmholtz-Zentrum Berlin für Materialien und Energie
2021-2023
University of Naples Federico II
2023
Bahawal Victoria Hospital
2023
New Jersey Institute of Technology
2012-2022
Pakistan Institute of Engineering and Applied Sciences
2018-2021
Bacha Khan University
2021
Raman scattering measurements on hydrogenated microcrystalline silicon prepared in a hydrogen plasma at deposition temperatures between approximately=65 and 400 degrees C are presented discussed. The shifts of the crystalline (c) 'amorphous-like' (a) components spectra to lower frequencies with decreasing crystallite size have been correlated lattice expansion finite dimensions crystallites these films. roles compressive stress samples investigated by annealing experiments under negative...
The intensity of the Raman-active ${\ensuremath{\Gamma}}_{25\mathcal{'}}$ mode nanometer-sized crystalline silicon, nc-Si, normalized to that calcium fluoride, ${\mathrm{CaF}}_{2}$, at 322 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ was measured for samples deposited under controllably varied conditions. Changes by a factor up approximately 6.7 were found. These are correlated with lattice expansion and compressive stress in thin films material. It is suggested enhancement scattering cross...
Microwave-assisted functionalization of single-wall carbon nanotubes (SWNTs) in a mixture nitric and sulfuric acids was carried out to synthesize highly water-dispersible nanotubes. Stable concentrations as high 10 mg/mL were obtained deionized water that are nearly 2 orders magnitude higher than those previously reported. This after only 3 min reaction. Fourier transform infrared spectra showed the presence carboxylated (-COOH) acid sulfonated (-SO(2).OH or -SO(3)(-) H(+)) groups on SWNTs....
This work is dedicated to the synthesis, characterization, and adsorption performance of reduced graphene oxide-modified spinel cobalt ferrite nanoparticles. The as-synthesized oxide (RGCF) nanocomposite has been characterized using FTIR spectroscopy, FESEM coupled with EDXS, XRD, HRTEM, zeta potential, vibrating sample magnetometer (VSM) measurements. proves particle size in range 10 nm. FESEM, EDX, TEM, FTIR, XPS analyses provide proof successful incorporation rGO sheets crystallinity...
Abstract It is shown that the crystal lattice expansion of microcrystalline silicon leads, in limit small crystallite size about 30 Å, to an instability diamond structure with respect amorphous phase. Simple thermodynamic considerations are presented which support idea crystalline-to-amorphous transformation being a discontinuous order—disorder phase transition.
Polycrystalline silicon films have been prepared using chemical transport in a low-pressure plasma temperature range 80-400 degrees C and at deposition rates up to approximately 3 AA s-1. Their Raman spectra show several features which are correlated with X-ray diffraction measurements attributed the presence of crystalline amorphous-like components. Optical absorption, infrared spectra, preliminary data on dark conductivity some further properties reported.
This investigation reports the quantitative assessment of endophyte-assisted floating treatment wetlands (FTWs) for remediation sewage and industrial wastewater. Typha domingensis was used to vegetate FTWs that were subsequently inoculated with a consortium pollutant-degrading plant growth-promoting endophytic bacteria. T. domingensis, being an aquatic species, holds excellent potential remediate polluted water. Nonetheless, conducted on Madhuana drain carrying water from Faisalabad City...
Environmental transmission electron microscope is used for in situ observations of the growth mechanism and reaction conditions carbon nanotubes. Chemical vapor deposition was performed by flowing propylene or acetylene gas (precursor) over Ni Co catalyst heated to 450 °C 700 °C. We are reporting process Multi-wall nanotubes formed at temperatures as low while only single-wall higher (700 above). At lower temperatures, a cubic phase also observed form on walls multi-wall
For pt.III see ibid., vol.16, p.2005 (1983). Measured values of the electrical conductivity, sigma , and electron spin density (g=2.0057) microcrystalline silicon can be essentially determined by extent contamination samples oxygen unless special precautions are taken as regards sample preparation and/or handling. deposited at a floating potential, two kinds incorporation identified: irreversible formation Si-O bonds on grain boundaries (and surface) reversible absorption which is probably...
Polynitrogen (PN) chain was predicted theoretically to be stable at ambient pressure by intercalating in multiple graphene layers. In this work, polynitrogen (N8–) deposited on boron-doped (PN-BG) and (PN-G) synthesized experimentally a facile cyclic voltammetry (CV) method. It further used for oxygen reduction reaction (ORR), which showed superior activity via four-electron pathway mechanism. BG prepared one-pot hydrothermal Characterizations over substrate, including X-ray photoelectron...
The appearance of superconductivity at relatively high temperatures in alkali metal-doped C(60) fullerene provides the challenge to both understand nature and origin determine upper limit superconducting transition temperature (T(c)). Towards latter goal, it is shown that doping with potassium-thallium rubidium-thallium alloys 400 430 degrees C range increases T(c) C(60)/C(70) mixtures 25.6 K above 45 K, respectively. Similar were also observed upon analogous pure C(60). Partial substitution...
Raman scattering, x-ray diffraction and electron results show that thin films of silicon (ranging in thickness from a few hundred Å to 1 μm) prepared by chemical transport low-pressure hydrogen plasma at temperature between 230 280 °C deposition rate up ∼0.5 sec−1, are polycrystalline. X-ray transmission microscopic data indicate crystallite sizes amounting Å.
Pure and aluminum doped CuO nanocrystalline material is prepared by composite-hydroxide mediated (CHM) approach. The structural analysis of these superstructures X-ray diffraction indicates reduction in average crystallite size estimated as 43–36 nm. This due to formation point defects oxygen vacancies produced the placement Al atoms lattice site. Incorporation content host matrix evident parameter variation, increase micro-strain dislocation density. FTIR spectroscopy gives information...
This work presents the preparation of inorganic-organic hybrid nanocomposites, namely three-dimensional polyaniline (Pani)/activated silica gel (ASG) (3D Pani@ASG), their characterization, and in removing application as a potential adsorbent for cationic brilliant green (BG), crystal violet (CV), anionic Congo red (CR), methyl orange (MO) dyes. Pani@ASG nanocomposites have been prepared by situ polymerization method characterized using various techniques such Fourier transform infrared...
This paper reports the self-assembly of carbon nanotubes (CNTs) on inside wall a steel capillary to fabricate microtrap for adsorption/desorption trace organics. The functioned as nanoconcentrator and an injector gas chromatography (GC). CNTs were deposited thin film by catalytic chemical vapor deposition from either CO or C2H4 precursor. sorbent synthesized C2H4-CVD (CVD = deposition) had higher CNT density thus was stronger sorbent. In general, microtraps showed high-capacity adsorption...