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Single crystal of l-valine doped ammonium dihydrogen phosphate has been grown by slow evaporation method at room temperature. The crystalline nature of the grown crystal was confirmed using powder X-ray diffraction technique. The different functional groups of the grown crystal were identified using Fourier transform infrared analysis. The UV-visible studies were employed to examine the high optical transparency and influential optical constants for tailoring materials suitability for optoelectronics applications. The cutoff wavelength of the title crystal was found to be 280nm with wide optical band gap of 4.7eV. The dielectric measurements were carried to determine the dielectric constant and dielectric loss at room temperature. The grown crystal has been characterized by thermogravimetric analysis. The second harmonic generation efficiency of the grown crystal was determined by the classical Kurtz powder technique and it is found to be 1.92 times that of potassium dihydrogen phosphate. The grown crystal was identified as third order nonlinear optical material employing Z-scan technique using He-Ne laser operating at 632.8nm., (Copyright © 2014 Elsevier B.V. All rights reserved.)

The poly(o-anisidine)-sulfuric acid-glucose oxidase (POA-H(2)SO(4)-GOx) electrode has been investigated in the present work. Platinum electrode was used for the synthesis of poly (o-anisidine)-sulfuric acid (POA-H(2)SO(4)) film using galvanostatic method with 0.2 M o-anisidine, 1.0 M H(2)SO(4) solution, 1.0 pH and 2 mA/cm(2) applied current density. The synthesized film was characterized using electrochemical technique, conductivity measurement, UV-visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. GO(X) was immobilized on synthesized POA-H(2)SO(4) film by cross-linking via glutaraldehyde in phosphate and acetate buffer. The Michaelis-Menten constant (K(m')) was determined for the immobilized enzyme. The glucose oxidase electrode shows the maximum current response at pH 5.5 and potential 0.6 V. The sensitivity of POA-H(2)SO(4)-GO(X) electrode in phosphate and acetate buffer has been recorded. The results of this study reveal that the phosphate buffer gives fast response as compared to acetate buffer in amperometric measurements.