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RISS 인기검색어
- 검색키워드
- 저자 : Zishan H. Khan (검색결과 5 건)
- 무료
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Studies on thin films of lead chalcogenides
Sushil Kumar,Zishan H. Khan,M.A. Majeed Khan,M. Husain 한국물리학회 2005 Current Applied Physics Vol.5 No.6
A good deal of information regarding the synthesis and optoelectro-structural properties of thin lms of lead chalcogenideshave been revealed. The development of laser technology had opened up new application for narrow gap lead salts and their alloys.The polycrystalline thin lms were deposited onto optically plane and chemically clean glass substrates by vacuum evaporation tech-nique. The lms were thin, uniform, smooth and tightly adherent to the substrates.Optical absorption spectroscopy, X-ray dirac-tion technique and currentvoltage characteristics method were used to characterize the lms. The absorption coecients andoptical band gaps of lms were determined by using FTIR spectrophotometer. The nature of sample, crystal structure and latticeparameters of lms were found from X-ray diractograms. The dc conductivities and activation energies of lms were measured intemperature range 300380K. Schottky junctions of PbS, PbSe and PbTe with indium metal were made. The barrier heights andideality factors of these metalsemiconductor junctions were determined by usingIV characteristics..
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Fabrication of Co-Doped ZnO Nanorods for Spintronic Devices
Ameer Azam,Faheem Ahmed,Sami S. Habib,Zishan H. Khan,Numan A. Salah 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
Herein, single-crystalline Zn1-xCoxO (0.0≤x≤0.10) nanorods were prepared using a facile microwave irradiation method. Structural analyses by X-ray diffraction and transmission electron microscopy revealed the incorporation of Co2+ in the lattice position of Zn2+ ions into the ZnO matrix. Field emission scanning electron microscopy and TEM micrographs revealed that the length and diameter of the undoped ZnO nanorods were about ~2 μm and ~200 nm, respectively. For Co-doped ZnO, the length and diameter were found to increase with an increase of Co doping. The selected area electron diffraction pattern indicated that the Zn1-xCoxO (0.0≤x≤0.10) nanorods had a single phase nature with the preferential growth direction along the [0 0 1] plane. Raman scattering spectra confirmed the shift of the E2high mode toward a lower wave number, suggested successful doping of Co ions at Zn site into the ZnO. Magnetic studies showed that Co doped ZnO nanorods exhibited room temperature ferromagnetism and the magnetization value increased with an increase in Co doping. The synthesis method presented here is a simple approach to prepare ZnO based diluted magnetic semiconductors nanostructures for practical application to spintronic devices.
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Carbon rich fly ash and their nanostructures
Numan Salah,Sami S. Habib,Zishan H. Khan,Ahmed Alshahrie,Adnan Memic,Attieh A. Al-ghamdi 한국탄소학회 2016 Carbon Letters Vol.19 No.-
Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp2. In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity, which might be suitable for the adsorption of gasses. Moreover, carbon nanoparticles (CNPs) of this fly ash were produced in parallel using the ball milling technique, and were evaluated as reinforcements for epoxy based composites. These CNPs have almost spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.
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Singh, Rahul,Bhattacharya, B.,Gupta, Meenal,Rahul, Meenal,Khan, Zishan H.,Tomar, S.K.,Singh, Vijay,Singh, Pramod K. Pergamon Press 2017 International journal of hydrogen energy Vol.42 No.21
<P><B>Abstract</B></P> <P>This paper reports the synthesis, characterization and dual electrochemical application of a new kind of ionic liquid (IL) based polymer electrolyte. The ionic liquid 1, 2-dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (DMPImTFSI) and polymer Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) have been chosen for present study. The electrical conductivity measurement shows many fold enhancement of ionic conductivity by blending IL into polymer matrix. Scanning electron microscopy (SEM) image confirms the uniform surface morphology of the synthesized thin film and cross-section image shows the interface layer of polymer and electrode. We have fabricated an efficient dye sensitized solar cell (DSSC) and electric double layer capacitor (EDLC) using IL-polymer electrolyte (optimized maximum conductivity) system which further affirms that this material is highly stable and reliable for long duration in energy devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel polymer gel electrolyte system for dual energy storage electrochemical application. </LI> <LI> Liquid like ionic conductivity of gel polymer electrolyte with high transparency in the film. </LI> <LI> Highly stable electrical performance of DSSC and EDLC devices. </LI> </UL> </P>
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Rahul,Singh, Pramod K.,Singh, Rahul,Singh, Vijay,Tomar, S.K.,Bhattacharya, B.,Khan, Zishan H. Elsevier 2017 Materials research bulletin Vol.89 No.-
<P><B>Abstract</B></P> <P>A nanocrystalline sensitizer CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> is synthesized by reacting methylammonium iodide with lead iodide, and its structural and photovoltaic properties were studied. In this paper we have succeeded in achieving a promising way of synthesizing powder and crystals of CH<SUB>3</SUB>NH<SUB>3</SUB>I. The powder of CH<SUB>3</SUB>NH<SUB>3</SUB>I was synthesized by making a solution of methyl amine and hydroiodic acid (HI) while for getting the crystal of CH<SUB>3</SUB>NH<SUB>3</SUB>I the same procedure was followed with the treatment of ethanol and further CH<SUB>3</SUB>NH<SUB>3</SUB>I powder solution was left in refrigerator (48h). For synthesize perovskite solution of powder and crystal, the equimolar ratio of CH<SUB>3</SUB>NH<SUB>3</SUB>I and PbI<SUB>2</SUB> were mixed in gamma-butyrolactone (GBL) solution. The powder and crystal solution of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> were further characterized using various experimental techniques such as x-ray diffraction pattern (XRD), UV⬜visible absorption spectroscopy, scanning electron microscope (SEM), transmission electron microscopy (TEM). A standard perovskite sensitized solar cell (PSSC) has been fabricated using CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite and polyethylene oxide (PEO) solid polymer electrolyte.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Clearcut comparative data of perovskite powder vs crystal. </LI> <LI> First clearcut evidence of beneficiality of crystals of pervoskite. </LI> <LI> Science behind PSSC datas are successfully presented. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P> <P>Shows the formation of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> (a) synthesised precipitate of methyl ammonium iodide (b) recrystallized perovskite (c) Solution of methyl ammonium tri-lead iodide.</P>
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