Synthesis and Characterization of Rhodamine B and Methylene Blue doped Potassium Hydrogen Phthalate Single Crystals

Abstract

Rhodamine B and Methylene Blue dye doped Potassium Hydrogen Phthalate single crystals were grown by slow evaporation technique. The impact of these dyes on the growth and attributes of KHP single crystals was studied. Single crystal XRD analysis validated the lattice characteristics of both the dye doped KHP crystals. The functional groups present in the produced crystals, as well as their modes of vibration, were identified using FTIR spectral analysis. The optical transparency of the as grown crystals was observed using UV–Visible spectrum. From Tauc's plot the band gap has been observed as 4.13 eV for the Rh B doped KHP and 4.2 eV for the MB doped KHP. Thermal stability of the grown materials has been determined by TG/DTA studies. The mechanical stability of the grown materials has been studied through Vickers microhardness technique. The work hardening coefficient 'n' was calculated as 3.05 and 2.73 for Rh B and MB doped KHP crystals respectively. The grown crystals are soft materials.