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Joseph Arul Pragasam, A.
- Effect of Urea Doping on Spectral, Optical and Thermal Properties of L-histidine Crystals
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Authors
Affiliations
1 Department of Physics, A.J. College of Engineering, Chennai-603 103, IN
2 Department of Physics, Sathyabama University, Chennai-600 119, IN
1 Department of Physics, A.J. College of Engineering, Chennai-603 103, IN
2 Department of Physics, Sathyabama University, Chennai-600 119, IN
Source
Indian Journal of Science and Technology, Vol 5, No 3 (2012), Pagination: 2369-2373Abstract
The organic nonlinear optical materials pure and urea-doped L-histidine crystals were grown by slow solvent evaporation method at the room temperature of 32 °C. The effect of doping urea on the spectral, optical, and thermal properties of L-histidine crystals has been investigated. Single crystal X-ray diffraction study was performed to know the structural characterization of the grown crystals and it shows slight structural changes as a result of doping. The XRD data reveals that both the crystals crystallize in the non-centro symmetric space group P212121. The FT-Raman and 13C-NMR spectra have been recorded for qualitative analysis and identification of the compounds. The optical transmittance study was performed to analyze the transparency of the grown crystals and found that the transparency was excellent in the wavelength region 235-1200 nm. The optical absorption coefficient α has been analyzed and the optical band gap of the grown crystals was estimated to be 5.28eV. Second harmonic generation of the grown crystals of this work was confirmed by the emission of green radiation using Nd:YAG laser. The surface morphologies of the crystals were analyzed by HR-SEM analysis. Differential scanning calorimetry technique (DSC) indicates that there is no phase transition takes place below 276 °C. Preliminary studies show that the grown crystals are suitable for optoelectronics applications and SHGs.Keywords
XRD, FT-Raman, 13C-NMR, Optical Transmittance, NLO, DSCFull Text
References
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- Studies on the Growth and Characterization of Organic L-Arginine Semicarbazone Dihydrate NLO Single Crystal
Abstract Views :223 |
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Authors
Affiliations
1 Department of Physics, SRR Engineering College, Chennai, Tamil Nadu, IN
2 Department of Chemistry, SRR Engineering College, Chennai, Tamil Nadu, IN
3 Department of Physics, Sathyabama University, Chennai, Tamil Nadu, IN
1 Department of Physics, SRR Engineering College, Chennai, Tamil Nadu, IN
2 Department of Chemistry, SRR Engineering College, Chennai, Tamil Nadu, IN
3 Department of Physics, Sathyabama University, Chennai, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 7, No 7 (2014), Pagination: 1014-1017Abstract
This paper reports an organic crystal of a New Nonlinear Optical (NLO) material, L-Arginine Semicarbazone dihydrate (abbreviated as LASC). The crystals were grown by slow evaporation from an aqueous solution and crystallize in monoclinic form which is confirmed by single crystal x-ray diffraction analysis. The molecular weight of the grown crystal was estimated by mass spectrometry. The FTIR spectra con-firm the presence of the functional groups in the crystal while The UV-vis-NIR spectrum of grown crystal LASC reveals its transparent nature. The optical absorption in the grown crystal is almost negligible in the UV and visible spectral regions with the lower cut off wavelength at around 350 nm. Minimum amount of optical absorption suggests that the LASC crystal is highly transparent in the UV-visible spectral region and is useful for nonlinear optical applications. The second harmonic generation is confirmed by the emission of green light and its efficiency is found to be 0.51 times that of KDP crystal. The photoconductivity study shows that the grown crystal exhibit negative photoconductivity. Primary studies show that the grown crystals are appropriate for optoelectronics applications and Second Harmonic Generations.Keywords
FTIR, NLO, Optical Absorption, Photoconductivity Study, Solution GrowthFull Text