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The present work is based on the photovoltaic properties of multilayered structure of Bismuth ferrite (BFO) and Barium titanate (BTO) thin films prepared by pulsed laser deposition technique on platinum coated silicon substrate. The multilayered structure possesses enhanced ferroelectric properties and shows a remarkable increase in photocurrent (from 1.56×10-7 A to 6.96×10-5 A) upon illumination with laser light of wavelength 405 nm at an intensity of 160 mW/cm2. The values of short circuit photocurrent and open circuit voltage were found to be 0.3184 mA/cm2 and -1.25 V, respectively, with a light-to-electricity conversion efficiency of 0.067%. A relatively high efficiency calculated at 405 nm for the developed multilayered BFO/BTO structure highlights its practical application in ferroelectric photovoltaics. [ABSTRACT FROM AUTHOR]

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]

We report a specific and ultrasensitive, label-free chemiresistive biosensor based on mercaptopropionic acid capped gold nanoparticles (GNP) functionalized single walled carbon nanotube (SWNT) hybrid for the detection of cardiac specific biomarker troponin-I (cTnI). GNPs were attached to SWNTs through a molecular linker 1-pyrenemethylamine. The highly specific cTnI antibody was covalently immobilized on GNPs through capping agent using carbodiimide coupling reaction. The cTnI interaction to its corresponding antibody was studied with respect to changes in conductance in SWNTs channel, and a detailed field-effect transistor characteristic was delineated. The device exhibited a linear response to cTnI from 0.01 to 10 ng ml-1. [ABSTRACT FROM AUTHOR]

Microwave induced spin-Hall effect has been investigated in sputtered Co/Pt bilayer thin film for its application in the field of spintronics. Measurements were carried out in the frequency range from 0.1 to 10.0 GHz at 10 mW power level with a sweeping magnetic field up to 0.2 T. The maximum dc voltage measured was 5.78 μV at 0.1 GHz in perpendicular applied magnetic field on the bilayer film. The direction of magnetic field, frequency, and power level influence the ferromagnetic resonance signal. Measurements confirm lower effective spin pumping due to a weak perpendicular anisotropy in the film. [ABSTRACT FROM AUTHOR]