Pradyumnan
@uoc.ac.in
Senior Professor
University of Calicut
RESEARCH, TEACHING, or OTHER INTERESTS
Physics and Astronomy, Condensed Matter Physics, Energy, Materials Science
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Jamshina Sanam P.K., Midhun Shah, and P.P. Pradyumnan
Elsevier BV
T. Parvathy and P.P. Pradyumnan
Elsevier BV
P. Hashir and P.P. Pradyumnan
Elsevier BV
Jamshina Sanam P.K., Midhun Shah, and P.P. Pradyumnan
Elsevier BV
Jamshina Sanam P.K., Midhun Shah, and P.P. Pradyumnan
Elsevier BV
C. Soumya and P. P. Pradyumnan
Springer Science and Business Media LLC
P.K. Jamshina Sanam, K.G. Gopika, and P.P. Pradyumnan
Elsevier BV
Midhun Shah, P.K. Jamshina Sanam, and P.P. Pradyumnan
Elsevier BV
K.V. Nabeela, T. Parvathy, and P.P. Pradyumnan
Elsevier BV
P.K. Jamshina Sanam, Midhun Shah, and P.P. Pradyumnan
Elsevier BV
C. Soumya and P.P. Pradyumnan
Elsevier BV
V. S. Vineetha and P.P. Pradyumnan
Wiley
AbstractMetal‐organic frameworks (MOFs) are precious resources for future demands in every realm of life. Currently, researchers are striving to create MOF materials with low dielectric constants for the microelectronic sector. In this work, a MOF compound, copper dimandelate (CuDM), is crystallized using the regulated diffusion of cations through viscous reactant media and its suitability for dielectric applications is studied for the first time. The crystallinity of the compound is confirmed and structural characterization is carried out using powder X‐ray diffraction measurements. The various functional groups present in the grown sample are confirmed by Fourier transform infrared and Raman analyses. Thermogravimetric analysis establishes the thermal stability of the material up to a temperature of 220 °C. The predicted chemical formula, (Cu[(C6H5) HOCH COO)]2) is verified by CHNS elemental analysis. The observed dielectric constant varies from 18.55 to 8.15 with applied frequency ranging from 0.01 Hz to 10 MHz, making it suitable for low‐k dielectric applications. The optical band gap and Urbach energy are obtained as 3.65 and 0.6211 eV, respectively, by UV–vis analysis. Solid‐state dielectric parameters, which include valence electron plasma energy, Penn gap, Fermi energy, electrical polarizability, and susceptibility of the material, are calculated using theoretical formulations.
T. Parvathy, K.V. Nabeela, and P.P. Pradyumnan
Elsevier BV
Midhun Shah, A.P. Jemshihas, P.K. Jamshina Sanam, and P.P. Pradyumnan
Elsevier BV
P.P. Pradyumnan and T. Parvathy
Elsevier
M.P Binitha and P.P Pradyumnan
Elsevier BV
Vineetha V S and P. P Pradyumnan
Informa UK Limited
ABSTRACT Biological metal-organic frameworks (BioMOF) formed by coordinating metal ions with biologically derived organic ligands have rising scientific stature owing to their superior functionalities. In the current work silver mandelate crystals (Ag(C8H7O3)), a silver-based bio-MOF are grown in hydrosilica gel medium activated with mandelate anions. XRD pattern of the powdered crystal confirmed the crystallinity of the crystals and the diffraction pattern is matched with the reported card data. Raman and FTIR spectra analyses confirmed the formation of the compound and ensured the presence of various functional groups in the crystal. Thermogravimetric analysis (TGA) revealed the chemical formula of the grown crystal and Differential Thermal analysis (DTA) stated that the compound is thermally stable. The single-stage thermal degradation over the temperature range of 160–350°C shows the- final degraded product is crystalline silver. The electronic spectral studies of the grown crystals show that the optical band gap energy is 4.36 eV. The dielectric behaviour is examined by studying the variation of dielectric constant, conductivity, and dielectric loss with the frequency of the applied field.
P.K. Jamshina Sanam, Midhun Shah, and P.P. Pradyumnan
Elsevier BV
Chambakkoottathil Soumya and Puthiya Purayil Pradyumnan
Hindawi Limited
Effect of structural and morphological deformation on the enhancement of thermoelectric properties of zinc oxide due to the dual substitution of indium and nickel was investigated. The doped materials resemble the hexagonal wurtzite structure of the host material, with increased crystallite size and strain, indicating the inclusion of the cations with larger radius. Reduction in the optical band gap energy from 3.1 eV to 2.20 eV is observed with a red shift in the absorption edge. The donor cations doped samples have high charge carrier density, resulting an increase in the transport properties. Highest electrical conductivity and seebeck coefficient were obtained for the doped samples leading to a hike in the power factor of 1427 μW/mK2. The thermal conductivity decreased with doping concentration, and highest figure of merit of 0.11 was obtained.
P. K. Jamshina Sanam, Midhun Shah, and P. P. Pradyumnan
Springer Science and Business Media LLC
P.K. Jamshina Sanam, Midhun Shah, and P.P. Pradyumnan
Elsevier BV
K. Safna, Peediyekkal Jayaram, M. Sabna, Prasoon Prasannan, J. Mayandi, and P. P. Pradyumnan
Springer Science and Business Media LLC
P. Shyni and P.P. Pradyumnan
Elsevier BV
T. Parvathy, N.A. Muhammed Sabeer, Niranjana Mohan, and P.P. Pradyumnan
Elsevier BV