Investigation on crystallization, spectroscopic, SHG and thermal studies of sodium bromide-doped L-alanine single crystals

• Published in: Journal of materials science. Materials in electronics 2025, Vol.36 (2), p.95, Article 95
• Main Authors: Usha, S., Selvarajan, P., Ponmani, S. Lincy Mary, Juliana, S. Gracelin
• Format: Article
• Language: English
• Subjects: Absorbance; Alanine; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal growth; Crystal lattices; Crystal structure; Crystallization; Cut off wavelength; Differential thermal analysis; Distilled water; Electrical resistivity; Energy bands; Energy gap; Fluorescence; Fourier transforms; Infrared spectroscopy; Lattice parameters; Materials Science; Optical and Electronic Materials; Optical properties; Optics; Parameter identification; Photoluminescence; Refractivity; Single crystals; Sodium; Sodium bromides; Spectroscopic analysis; Spectrum analysis; Unit cell; X-ray diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-14159-y

Using a solution technique with a long evaporation process and double-distilled water as the solvent, single crystals of sodium bromide-doped L-alanine (SBLA) were produced during a 55-day growth phase. Advanced techniques were used to evaluate the SBLA crystal, including single XRD, powder XRD analysis, FTIR Spectroscopy, UV–Vis NIR spectroscopy, fluorescence study, TG/DTA study and SHG investigation. Powder XRD and single crystal XRD analysis have been used to identify the sample’s structure, space group, volume, Miller indices (hkl) and unit cell properties. This led to the discovery that the structure of the SBLA single crystal was orthorhombic. The lattice parameters of SBLA crystal found by both powder XRD and single crystal XRD methods are almost the same. Utilizing FTIR analysis, the chemical groups included in the developed crystal have been identified. The absorbance and transmittance range, energy band gap value, extinction coefficient, reflectance and refractive index value, optical and electrical conductivity, and skin depth have all been determined by optical research. As a result, a significant absorbance peak in the UV region was found, and 227 nm was found to be the cut-off wavelength and by Tauc’s plot, the optical band gap of the sample was found to be 5.447 eV. When analyzing the sample’s photoluminescence behavior, sodium bromide-doped L-alanine single crystal (SBLA) exhibits strong green fluorescence emission at 544 nm. The material stability and kinetic and thermodynamic parameters of the SBLA single crystal have been analyzed using TG/DTA study. The SHG efficiency of Sodium bromide-doped L-alanine material is found to be 1.57 higher than that of KDP. The results and discussion of several methods of investigation of the grown SBLA single crystal are detailed in this paper.