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- 저자 : K. Jayanthi (검색결과 3 건)
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Electronic and Luminescent Characteristics of Aluminum Doped ZnO Nanocrystals
K. Jayanthi,Santa Chawla 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Aluminium doped ZnO (AZO) nanocrystals were prepared under different ambient conditions (argon and air) to study the effect of structural, luminescence and electronic properties. AZO nanocrystals were highly crystallized in hexagonal wurtzite phase with spherical morphology. Prominent yellow emission is observed in both the AZO samples owing to recombination between Al3+ donor levels and intrinsic acceptor centre. Both AZO samples exhibit n-type conduction with resistivity of AZO prepared in inert (argon) ambient condition showing lower resistivity compared to the one synthesized in air atmosphere.
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Synthesis and surface modification of ZnO:Cu nanoparticles by silica and PMMA
Bharti Choudhary,Santa Chawla,K. Jayanthi,K.N. Sood,Sukhvir Singh 한국물리학회 2010 Current Applied Physics Vol.10 No.3
ZnO nanoparticles doped with Cu were synthesized by solid state reaction using different precursor routes and varying growth environment. Average crystallite size varied from 40 to 100 nm depending upon synthesis temperature, lower temperature favouring smaller particle size. Scanning electron microscope (SEM) images showed that particles synthesized at 250 ℃ were in the shape of nanorods but those synthesized at 900 ℃ had spherical shape. Luminescence emission showed marked dependence on the growth conditions varying from ultraviolet (UV) emission to green emission. For making the luminescent nanoparticles bio-compatible, a bioinorganic interface on ZnO:Cu nanoparticles was created by coating them with inert silica. Surface modification of ZnO:Cu was also done with lipophilic polymethylmethacrylate (PMMA). ZnO:Cu nanoparticles showed hexagonal wurtzite structure and the coating of silica was confirmed with the presence of two extra peaks due to silica in the XRD spectra. Thermogravimetric analysis (TGA) and FTIR spectroscopy indicated that PMMA molecules were adsorbed on the surface of ZnO:Cu nanoparticles. SEM images revealed that PMMA adsorption improved the dispersibilty of ZnO:Cu nanoparticles.
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T.S. Nidhin,Anindya Bhattacharyya,R.P. Behera,T. Jayanthi,K. Velusamy 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
Field programmable gate arrays (FPGAs) are getting more attention in safety-related and safety-criticalapplication development of nuclear power plant instrumentation and control systems. The high logicdensity and advancements in architectural features make static random access memory (SRAM)-basedFPGAs suitable for complex design implementations. Devices deployed in the nuclear environmentface radiation particle strike that causes transient and permanent failures. The major reasons for failuresare total ionization dose effects, displacement damage dose effects, and single event effects. Differentfrom the case of space applications, soft errors are the major concern in terrestrial applications. In thisarticle, a review of radiation effects on FPGAs is presented, especially soft errors in SRAM-based FPGAs. Single event upset (SEU) shows a high probability of error in the dependable application development inFPGAs. This survey covers the main sources of radiation and its effects on FPGAs, with emphasis on SEUsas well as on the measurement of radiation upset sensitivity and irradiation experimental results atvarious facilities. This article also presents a comparison between the major SEU mitigation techniques inthe configuration memory and user logics of SRAM-based FPGAs.
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