International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Spectroscopic, Mechanical and Optical Properties of L-Serine Ammonium Carbonate (LSAC) Single crystal M.Dinesh Raja1*, P.Christuraj1 and J.Madhavan2 1Department
of Physics, St.Joseph’s College (Autonomous), Tiruchirappalli – 620 002, India of Physics, Loyola College, Chennai – 600 034, India *Email: mdineshraja6@gmail.com ---------------------------------------------------------------------***--------------------------------------------------------------------2.SYNTHESIS Abstract:L-serine ammonium carbonate (LSAC) Single 2Department
crystal have been grown by slow evaporation solution growth technique. Energy dispersive X-ray analyses (EDAX) prove the incorporation of metal ions into crystals. The presence of functional groups is identified by Fourier transform infrared (FTIR) analyses. The mechanical properties have been studied by vicker’s microhardness test. UV–vis-NIR spectroscopy shows that minimum absorption in the entire visible region. The optical band gap (Eg) value of the grown crystal is obtained from the Tauc’s plot of (αhν)2 vs hν which was determined by extrapolating the linear region of the curve to the hν axis where (αhν)2=0. LSAC crystals have enhanced second harmonic generation (SHG) efficiency indicating that these crystals are potential candidates for non linear optical (NLO) applications.
The appropriate stoichiometric amount of L-Serine and ammonium carbonate was taken with excess of doubly deionized water to synthesize LSAC. The as said molecules were dissolved in deionized water and saturated LSAC solution was prepared at room temperature and kept for slow evaporation. The grown crystal has the dimension 12mm×11mm×5mm as shown in the Fig.1.
Fig.1.Photograph of as grown LSAC
Key Words: SHG, NLO, EDAX, LSAC, UV–vis-NIR spectroscopy, FTIR
3. CHARACTERISATION
1. INTRODUCTION
3.1EDAX
Nonlinear optical (NLO) materials, with high frequency conversion efficiency have the most required properties for optical communication and optical storage devices, and numerous device applications [1, 2]. Amino acids family crystals possess high NLO efficiency because of their noncentrosymmetric space group and chiral carbon atom [3, 4]. Amino acids are popularly referred as the building blocks of protein. Amino acid family crystals are of great interest due to their rich nonlinear optical properties. Its specific features such as Zwitterionic nature, weak Vander Waals, hydrogen bonds and wide transmittance in the visible and UV-spectral region make them an ideal candidate for NLO applications [5, 6]. In the present investigation is aimed at the growth of L-serine ammonium carbonate single crystals by slow evaporation method at room temperature. The grown crystals have been subjected to EDAX, FTIR, UV analysis, optical band gap measurements, second harmonic generation (SHG) measurement, and Vicker’s hardness test.
Small crystal of LSAC was subjected to EDAX analysis Fig.2 and Table.1. As the presence of hydrogen ions cannot be detected by EDAX analysis due to its low atomic numbers [7]. The low percentage of incorporation of ammonia may be due to their larger ionic radii. Even though the amount of ammonia is less, it plays an important role in the enhancement of NLO property in the crystals.
Fig.2. The EDAX spectrum of the LSAC sample recorded in electron microscope
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