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K.Y. Kok B. Goldsmith N.B. Saidin 《Journal of magnetism and magnetic materials》2010,322(24):3876-3881
Permalloy (Ni80Fe20)/Cu multilayered nanowires (NWs) were electrodeposited using a template directed method from sulfate baths via pulse potential technique. Microstructures and compositions of the nanowires were characterized using various microscopy and spectroscopy techniques. To synthesize compositionally uniform nanowires with high efficiency, new sulfate baths with a high content of Ni2+ were developed. The effects of deposition potential and concentration of metal ions were optimized to reduce composition inhomogeneity and incorporation of copper in the permalloy layers. Composition of the NiFe layers was found to be close to 20 at% Fe with a maximum of 5 at% Cu. TEM analysis indicated that individual nanowires exhibit distinct and coherent layering structure with rough and wavy interfaces. A synthesized single nanowire was also AC dielectrophoretically assembled across the microfabricated gold electrodes for subsequent magnetoresistance measurements. 相似文献
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Ytterbium-sensitized thulium-doped fiber laser with a single-mode output operating at 1900-nm region
S. W. Harun A. Halder M. C. Paul S. M. M. Ali N. Saidin S. S. A. Damanhuri H. Ahmad S. Das M. Pal S. K. Bhadra 《中国光学快报(英文版)》2012,(10):39-41
A single-mode laser is demonstrated using a newly developed double-clad thulium-ytterbium-doped fiber (TYDF) in a linear cavity formed by two fiber Bragg gratings (FBGs). The YTF used is drawn from a D-shape preform fabricated using the modified chemical vapor deposition and solution doping technique. The laser is operated at 1 901.6 nm via the transition of thulium ions from 3F4 to 3H6 with the assistance of ytterbium to thulium ion energy transfer. The efficiencies of the laser are 0.71% and 0.75% at 927- and 905-nm multimode pumping, respectively. The thresholds of the launched pump power for 927- and 905-nm pumping are 1 314 and 1 458 mW, respectively. A 7-mW output is obtained at a 905-nm pump power of 2 400 mW. 相似文献
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Huri N. A. D. Damanhuri S. S. A. Hamzah A. Saidin N. Harun S. W. Ahmad H. Paul M. C. Das S. Pal M. Bhadra S. K. 《Optics and Spectroscopy》2011,111(2):312-314
An investigation of the characteristics of temperature-dependent fluorescence of a Cerium Ytterbium (Yb3+)- doped silica fiber (CYDF) is presented. A 0.3-m long CYDF is diode-pumped at 976 nm and the fluorescence intensity is measured
against the fiber temperature. It is observed that the fluorescence intensity decreases linearly with the increase in temperature
due to the enhancement of non-radiative transition as well as the quenching of the Ytterbium luminescence. The sensitivity
of the sensor is obtained at 0.0024 mW/°C with a linearity of more than 98% in the range of room temperature to 250°C. The
proposed sensor is compact, low-cost and has long-life. It can also be combined with a wide range of existing fiber-optic
multiplexing schemes that can simultaneously detect multiple physical parameters. 相似文献
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Choo Thye-Foo Saidin Nur Ubaidah Zali Nurazila Mat Kok Kuan-Ying 《Journal of nanoparticle research》2022,24(7):1-16
Journal of Nanoparticle Research - The melting of micro-/nanoparticles in an alloy melt is investigated by using the asymptotic method. The asymptotic solution of the dynamic model for... 相似文献
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Mohamad Syahrizal Ahmad Illyas Md Isa Norhayati Hashim Suyanta M. Si Mohamad Idris Saidin 《Journal of Solid State Electrochemistry》2018,22(9):2691-2701
A new zinc-layered hydroxide-L-phenylalanate (ZLH-LP)-modified multiwalled carbon nanotube (MWCNT) was prepared as a new material of paste electrode for the detection of paracetamol (PCM) in 1.0?×?10?1 M phosphate buffer solution and at pH 7.5. The electrochemical characterization of the MWCNTs/ZLH-LP paste electrode was characterized by square wave voltammetry, electrochemical impedance spectroscopy, and cyclic voltammetry while the morphology properties of the MWCNTs, ZLH-LP, and MWCNTs/ZLH-LP were investigated using transmission electron microscopy and scanning electron microscopy. Under optimized conditions, the MWCNTs/ZLH-LP paste electrode demonstrated an excellent electrocatalytic activity towards oxidation of PCM in the linear responses’ ranges from 7.0?×?10?7 M to 1.0?×?10?4 M (correlation coefficient, 0.996) with the limit of detection obtained at 8.3?×?10?8 M. As a conclusion, the MWCNTs/ZLH-LP paste electrode revealed good repeatability, reproducibility, and stability, and was found to be applicable for use in pharmaceutical tablet samples. 相似文献
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N.Saidin D.I.M.Zen S.S.A.Damanhuri S.W.Harun H.Ahmad F.Ahmad K.Dimyati A.Halder M.C.Paul M.Pal S.K.Bhadra 《中国光学快报(英文版)》2013,(6):81-83
We report a ring cavity passively harmonic mode-locked fiber laser using a newly developed thuliumbismuth co-doped fiber(TBF) as a gain medium in conjunction with a carbon nanotube(CNT)-based saturable absorber.The TBF laser generates a third harmonic mode-locked soliton pulse train with a high repetition rate of 50 MHz and a pulse duration of 1.86 ps.The laser operates at 1 901.6 nm with an average power of 6.6 mW,corresponding to a pulse energy of 0.132 nJ,at a 1 552 nm pump power of 723.3 mW. 相似文献
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