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21 results on '"Puri, Nitin K."'

20. Stress induced enhanced polarization in multilayer BiFeO3/ BaTiO3 structure with improved energy storage properties.

Author

Gupta, Vinay, Sharma, Savita, Puri, Nitin K., Tomar, Monika, and Kumar, Ashok

Subjects
POLARIZATION (Nuclear physics), MULTILAYERED thin films, ENERGY storage
Abstract

Present work reports the fabrication of a multilayer (5-layer) structure of BiFeO3(BFO)/BaTiO3(BTO) using spin-coating technique. The crystallographic structure, surface morphology and ferroelectric behavior of multilayer structure in metal-ferroelectric-metal capacitor have been studied. Le-Bail refinement of X-ray diffraction data revealed the formation of polycrystalline pure perovskite phase with induced stress. The values of remnant (Pr) and saturation polarization (Ps) for BFO/BTO multilayer structure are found to be 38.14 µC/cm² and 71.54 µC/cm2 respectively, which are much higher than the corresponding values reported for bare BFO thin film. A large value of dielectric constant of 187 has been obtained for multilayer structure with a low leakage current density of 1.09 × 10-7 A/cm2 at applied bias of 10 V. The BFO/BTO multilayer structure favors the enhanced energy storage capacity as compared to bare BFO thin film with improved values of energy-density and charge-discharge efficiency as 121 mJ/cm³ and 59% respectively, suggesting futuristic energy storage applications. [ABSTRACT FROM AUTHOR]

Published
2015
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21. Synthesis and fabrication of 2D Tungsten trioxide nanosheets based platform for impedimetric sensing of cardiac biomarker

Author

Sandil, Deepika, Srivastava, Saurabh, Khatri, Ritika, Sharma, Kanika, and Puri, Nitin K.

Abstract

Herein, we report the development of a two-dimensional (2D) label-free matrix for cardiac biomarker detection. Tungsten trioxide nanosheets (WO3NS) were synthesized by a facile, environmentally friendly hydrothermal method and subsequently functionalized chemically using 3-aminopropyletriethoxysilane (APTES). Thin film of APTES functionalized WO3NS was deposited on indium tin oxide (ITO) substrate using electrophoretic deposition technique. The fabricated APTES/WO3NS/ITO electrode endows with large surface area for high loading of cardiac troponin I antibodies (anti-cTnI), good stability and strong adsorption platform for the biomolecules immobilization. The selective and quantitative detection of cTnI biomarker was accomplished by immobilizing anti-cTnI on APTES/WO3NS/ITO platform. The electrochemical sensing using anti-cTnI/APTES/WO3NS/ITO immunoelectrode was studied as a label-free immunoassay format using EIS (electrochemical impedance spectroscopy) technique. The performance of the sensor as investigated with the measurement of charge transfer resistance (RCT) for variant concentrations of cTnI antigen demonstrated good sensitivity as 30.8 Ω mL ng−1 cm−2for a linear detection range 0.1 to 100 ng mL−1along with good stability up to 6 weeks. The competency of the biosensor was also tested by detecting cTnI antigen in spiked human serum samples.

Published
2021
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