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S. Chattopadhyay,T.K. Nath 한국물리학회 2011 Current Applied Physics Vol.11 No.5
An experimental study of p-silicon (Si)/La_0.7Sr_0.3MnO_3 (LSMO) junction in which the LSMO and silicon are separated by a thin interfacial silicon dioxide (SiO_2) layer has been fabricated. Two type of SiO_2 layer has been discussed here ― one is native oxide and another one is thermal oxide. The thermal SiO_2 film is grown on Si by annealing it at 800 ℃ in oxygen atmosphere. The LSMO film of about 64 nm thick has been grown on SiO_2 at 800 ℃ substrate temperature in 10^-1 mbar oxygen pressure by Pulsed Laser Deposition technique. The LSMO/SiO_2/Si heterostructure exhibits MOS diode-like behavior with all type of possible current flow mechanisms (such as thermionic emission, tunneling, recombination degeneration,etc.) through the heterojunction. The high field Fowler-Nordheim [ln(J_FN/E^2) vs 1/E] plot at different temperatures confirms that the dominating transport mechanism across the heterostructure is tunneling. The junction resistance changes under magnetic field and the junction magnetoresistance is found to be ∼31% with 1T applied magnetic field at room temperature at a bias voltage of 2.2 V. The capacitor-voltage characteristics confirm the presence of trap charges.
Maitra S.,Mitra R.,Nath T.K. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
Herein this work, we have used the sol-gel chemical synthesis method to prepare spherical shaped MgFe2O4 nanoparticles having size 45–50 nm. Using 1 mol L 1 Sodium Perchlorate (NaClO4) electrolyte, a capacitance of 61 F/g, a capacitance retention of 82.91% (after undergoing 1000 cycles), and an energy density of 41 Wh/kg have been achieved. Using 1 mol L 1 Magnesium Perchlorate (Mg(ClO4)2) as electrolyte, a capacitance of 43 F/g, a capacitance retention of 82.15%, and an energy density of 29 Wh/kg have been realized. Furthermore, MgFe2O4 nanospheres exhibited an overpotential (η) = 1.09 V, a Tafel slope (b) = 317 mV/dec in regard to alkaline Oxygen Evolution Reaction (OER) electrocatalyst. It also achieved η = 402 mV and b = 241 mV/dec in regard towards alkaline Hydrogen Evolution Reaction (HER) electrocatalyst. These results signify the suitability of MgFe2O4 nanoparticles for high energy density aqueous supercapacitor and water splitting electrocatalyst applications.
S. Maitra,R. Mitra,T.K. Nath 한국물리학회 2020 Current Applied Physics Vol.20 No.5
In this work, we have successfully synthesized MgNiO2 using a sol-gel wet chemical synthesis technique named MNO - 3. Electrochemical measurements in the presence of aqueous 1 M Li2SO4 electrolyte indicate that MNO - 3 samples exhibit a capacitance value of about 30 F/g and an energy density of about 20 Wh/kg. Subsequently, in the experiment involving aqueous 0.5 M Na2SO4 electrolyte system, it has been found that the capacitance for MNO - 3 sample is about 34 F/g and the energy density is about 23 Wh/kg for MNO - 3 sample. Finally, in the presence of aqueous-based 1 M Mg(ClO4)2 electrolyte, MNO - 3 sample is found to exhibit a capacitance of about 26 F/g and an energy density of about 17 Wh/kg, respectively. In all three electrolyte systems, the MNO -3 sample exhibit a long cycle capacitance retention of greater than 85% for 1000 charge-discharge cycles.
S. Maitra,P.K. Chakraborty,R. Mitra,T.K. Nath 한국물리학회 2020 Current Applied Physics Vol.20 No.12
We report here the cost-effective synthesis of Magnesium Cobalt Oxide (MgCoO2) sample by the sol-gel synthesis route labeled as MCO - 3. In presence of aqueous 1 M Lithium Sulphate (Li2SO4) electrolyte, we obtained a capacitance of 56 F/g, an energy density of 38 Wh/kg and a capacitance retention of 92.53 % (at 5 A/g) after undergoing 1000 charge-discharge cycles. For the aqueous 1 M Sodium Perchlorate (NaClO4) electrolyte system, we found the capacitance, energy density and capacitance retention of 47 F/g, 31 Wh/kg and 91.41% (at 3.5 A/g for 1000 charge-discharge cycles), respectively. These results establish MgCoO2 as suitable electrode material in aqueous lithium-ion and sodium-ion supercapacitor devices. Further, MCO - 3 in the presence of aqueous 1 M Potassium Hydroxide (KOH) electrolyte showed an overpotential of 400 mV and a Tafel slope of 174 mV/dec, making it a suitable candidate for alkaline Hydrogen Evolution Reaction (HER) electrocatalyst.
Lupus Risk Variant Increases pSTAT1 Binding and Decreases ETS1 Expression
Lu, X.,Zoller, Erin E.,Weirauch, Matthew T.,Wu, Z.,Namjou, B.,Williams, Adrienne H.,Ziegler, Julie T.,Comeau, Mary E.,Marion, Miranda C.,Glenn, Stuart B.,Adler, A.,Shen, N.,Nath, Swapan K.,Stevens, An University of Chicago Press [etc.] 2015 American journal of human genetics Vol.96 No.5
Genetic variants at chromosomal region 11q23.3, near the gene ETS1, have been associated with systemic lupus erythematosus (SLE), or lupus, in independent cohorts of Asian ancestry. Several recent studies have implicated ETS1 as a critical driver of immune cell function and differentiation, and mice deficient in ETS1 develop an SLE-like autoimmunity. We performed a fine-mapping study of 14,551 subjects from multi-ancestral cohorts by starting with genotyped variants and imputing to all common variants spanning ETS1. By constructing genetic models via frequentist and Bayesian association methods, we identified 16 variants that are statistically likely to be causal. We functionally assessed each of these variants on the basis of their likelihood of affecting transcription factor binding, miRNA binding, or chromatin state. Of the four variants that we experimentally examined, only rs6590330 differentially binds lysate from B cells. Using mass spectrometry, we found more binding of the transcription factor signal transducer and activator of transcription 1 (STAT1) to DNA near the risk allele of rs6590330 than near the non-risk allele. Immunoblot analysis and chromatin immunoprecipitation of pSTAT1 in B cells heterozygous for rs6590330 confirmed that the risk allele increased binding to the active form of STAT1. Analysis with expression quantitative trait loci indicated that the risk allele of rs6590330 is associated with decreased ETS1 expression in Han Chinese, but not other ancestral cohorts. We propose a model in which the risk allele of rs6590330 is associated with decreased ETS1 expression and increases SLE risk by enhancing the binding of pSTAT1.