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RISS 인기검색어
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- 저자 : Kirupavathy S. Shahil (검색결과 2 건)
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S. Stella Mary,S. Shahil Kirupavathy 한국전기전자재료학회 2019 Transactions on Electrical and Electronic Material Vol.20 No.6
Swift heavy ion irradiation on nonlinear optical active potassium pentaborate (KB5) single crystal altered the structural, optical and electrical properties of the crystal. Point defects created during irradiation is evidenced from the high resolution X-ray diff raction analysis. From the photoluminescence spectrum it is understood that the weakening of B–O bond led to red shift in the KB5 crystal. The frequency dependence of dielectric constant and dielectric loss is been explained on the basis of polarization mechanism. Also it is observed that the polarization decreases due to trapping of charge carriers atthe defect regions. The increase in conductivity with frequency is due to the reduction in the space charge polarization at higher frequencies.
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Kumar M. Infant Shyam,Kirupavathy S. Shahil,Shalini S. 한국탄소학회 2021 Carbon Letters Vol.31 No.4
Most recently, graphene-related composite-modifed electrode surfaces are been widely employed to improve surface interactions and electron transfer kinetics. Hydrothermally prepared strontium pyro niobate (SPN) and reduced graphene oxide/ strontium pyro niobate (RGOSPN) nanostructures reveal excellent morphology. X-ray difraction analysis of SPN and RGOSPN agree with standard data. Thermogravimetry–diferential scanning calorimetry analyses show that RGOSPN has higher thermal stability than SPN. In addition, from the polarization–electric feld (P–E) loop measurements, the estimated value of remnant polarization (Pr ) and coercive electric feld (Ec) of SPN are 0.039 µC cm−2 and −2.90 kV cm−1 and that of RGOSPN nanocomposite are 0.0139 µC cm−2 and −2.04 kV cm−1. Cyclic voltammetry measurements show that RGOSPN nanocomposite manifests the possibility of electrochemical reversibility beyond long cycles without change in performance. The redox cycle reveal that RGOSPN can be used as part of a composite electrode for hybrid capacitors dynamic conditions. Moreover, the specifc capacitance of SPN and RGOSPN was calculated using galvanostatic charge–discharge (GCD) technique. The observed energy density of 9.1 W h kg−1 in RGOSPN is higher when compared with previous reported values.
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