Results 1 - 5 of 5
Results 1 - 5 of 5. Search took: 0.015 seconds
|Sort by: date | relevance|
[en] Single crystals of glycine (GL) and creatinine doped glycine (GLC) crystals were crystallized using slow evaporation solution growth technique. Structural analysis of the grown crystals has been carried out using single crystal XRD. The polymorphic forms and lattice parameters of glycine crystals were confirmed. The identification of functional groups and the intensity variation, peak shifting caused by creatinine in glycine crystals were recognized by Raman spectroscopic analysis. Good optical quality and the optical parameters such as optical band gap, cut-off wavelength, transmittance were inferred from UV–Visible spectroscopy. Second Harmonic Generation (SHG) shows significant enhancement in the efficiency of GLC crystal. GLC exhibited improved piezoelectric coefficient d33 of 8 pC/N which was higher compared with other glycine crystals. The incorporation of creatinine increases the mechanical strength and laser stability (41.93 GW/cm2) of GLC crystals. In doped glycine crystal, dielectric constant increases with decrease in dielectric loss. All enhanced physical properties of GLC crystal were investigated which proposes the suitability of GLC crystal towards Optoelectronic applications.
[en] First-principle calculations of structural, electronic and magnetic properties of perovskite NaBeO and KBeO are investigated using Full-Potential Linearized Augmented Plane Wave (FP-LAPW) method. The structural optimization reveals that the compounds NaBeO and KBeO are stable in ferromagnetic state. The calculated formation energies confirm stability in both the perovskites. Electronic and magnetic properties are studied under GGA-PBE scheme. Further, it is improvised using TB-mBJ potential in exchange–correlation terms and delivered good results. The integer-valued total magnetic moment of 3μ in all cases signifies the half metallicity in reported compounds. The ferromagnetism predicted in both compounds is primarily due to p-orbitals of oxygen. The observed energy gaps in spins are quite larger in TB-mBJ approach and confirm half metallic ferromagnetism in compounds and hence, the compounds could be suitable for spintronic applications.
[en] Laser action in methyl methacrylate (MMA) co-doped with sulforhodamine B and crystal violet dyes was investigated. The dye mixture was incorporated into a solid polymeric matrix and was pumped by a 532-nm Nd:YAG laser. Distributed feedback dye laser (DFDL) action was induced in the dye mixture using a prism arrangement both in the donor and acceptor regions by an energy transfer mechanism. Theoretically, the characteristics of acceptor and donor DFDLs, and the dependence of their pulse widths and output powers on acceptor—donor concentrations and pump power, were studied. Experimentally, the output energy of DFDL was measured at the emission peaks of donor and acceptor dyes for different pump powers and different acceptor—donor concentrations. Tuning of the output wavelength was achieved by varying the period of the gain modulation of the laser medium. The laser wavelength showed continuous tunability from 563 nm to 648 nm
[en] Solar energy is conceivably the largest source of renewable energy at our disposal, but vital advances are expected to make solar cells economically viable. Biodegradable and flexible solar cells are currently under extensive investigation for environmentally-friendly electronic applications. Biomaterials based solar cell is emerging due to their sustainable, scalable, abundant, renewable, and environmentally-friendly energy production. This review highlights recent research progress in the emerging group of biomaterials and their integration for flexible solar cell devices. The more emphasis is given to the absolute recyclable solar cell technology, processing conditions and optimized processing conditions to produce a high amount of energy. This review briefly describes the recent progress in these classes of material, covering substrates and semiconductors. A prominent demand still exists for a next-generation of flexible, biodegradable and biocompatible solar cell substrate for ultimate energy generation application.
[en] In this work, Graphene Oxide (GO) reinforced novel polymer composites comprising of poly (4-styrenesulfonic acid) (PSSA) and polyvinyl alcohol (PVA) blend matrix have been developed using colloidal processing technique. The properties and the structure of prepared composites were investigated using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), UV–vis spectroscopy (UV), Thermogravimetric analysis (TGA), Polarized optical microscopy (POM), Scanning electron microscopy (SEM) and Atomic force microscopy (AFM). The FTIR and Raman spectroscopy analysis indicate the strong interfacial interaction between GO and PSSA/PVA blend matrix. The XRD and SEM analysis confirm that GO was fully exfoliated into individual graphene sheets and dispersed homogeneously within the polymer matrix. The effective reinforcement of GO into PSSA/PVA blend matrix has resulted in the enhancement of dielectric constant. The dielectric constant has increased from 82.67 (50 Hz, 150 °C) for PSSA/PVA (50/50) blend to 297.91 (50 Hz, 150 °C) for PSSA/PVA/GO composites with 3 wt % GO loading. The dielectric loss (tan δ) has increased from 1.56 (50 KHz, 140 °C) for PSSA/PVA (50/50) blend to 2.64 (50 KHz, 140 °C) for PSSA/PVA/GO composites with 3 wt % GO loading. These findings provide a new insight to fabricate flexible, high-k dielectric composite as a promising material for energy storage applications. - Highlights: • Graphene Oxide was prepared from natural graphite using modified Hummers method. • Novel PSSA/PVA/GO composites were prepared by reinforcing GO into PSSA/PVA blend matrix. • Molecular level dispersion of GO in PSSA/PVA blend matrix was successfully achieved. • Enhancement in the dielectric constant was observed due to effective reinforcement of GO in PSSA/PVA blend matrix. • PSSA/PVA/GO composites with high dielectric performances can be considered for energy storage applications.