GROWTH AND CHARACTERIZATION OF L - PHENYL ALANINE ADDED SULPHAMICACID SINGLE CRYSTALS

Abstract

Pure sulphamic acid (SA) and L-phenyl alanine added sulphamic acid (LPASA) were grown by slow evaporation
technique. Structural analysis revealed that the orthorhombic crystal structure was retained for both the grown crystals
and the crystallinity was improved upon the addition of L-phenyl alanine. The vibrational analysis of both FTIR and
Raman exhibited all the vibrational frequencies related to the stretching, deformation, and zwitter ion nature of the
sulphamic acid crystal. All the vibrational modes proved that the addition of L-phenyl alanine enhanced crystalline
nature. The elemental analysis confirmed the presence of all constituent elements and the surface morphological study
affirmed the improvement in classification of crystal grains. The transmittance was raised to 92%. Moreover, the
hardness of the crystal was enhanced. The thermal stability and hardness of the SA crystal was intensified with the
addition of L-phenyl alanine. The photoluminescence studies revealed that the blue emission intensity was increased on
addition of L-phenyl alanine. Therefore L-phenyl alanine was considered as a good additive for sulphamic acid to improve
the crystalline nature as well as the thermal and mechanical stability of the crystal. Also, the blue emission intensity was
enhanced upon L-phenyl alanine addition. Hence this material may be useful for application in blue emission LED
devices.