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<p>Sulphamic acid (SA) and Rhodamine 6G dye doped sulphamic acid single crystals (SR6G) were grown from slow evaporation technique. Single crystal XRD confirms orthorhombic structure for grown crystal. Functional groups were determined and assigned by FTIR and Raman spectroscopy. Photoluminescence (PL) spectra had been recorded and Blue shifts were observed in the obtained photoluminescence spectra. The presence of dye molecules within the crystal lattice is confirmed by the peak observed at 542&#xa0;nm in the photoluminescence spectra. Optical band gap is determined from UV-Vis absorption spectra for pure and dye doped crystals. From optical band gap relation (Tauc’s relation) 5.13&#xa0;eV band gap for pure SA and 5.33&#xa0;eV band gap for dye doped SA crystal was observed and found that optical band gap was increased due to incorporation of dye molecule in crystal structure. Optical band gap above 4&#xa0;eV confirms that the synthesized crystals belongs to insulator materials. Behaviour of dye in aqueous solution was also compared with dye in crystal in absorption spectra. Thermo-gravimetric analysis (TGA) and differential thermo-gravimetric analysis (DTA) were conducted to verify the thermal stability of the crystal. The TGA-DTA analysis revealed that the pure sulphamic (SA) crystals exhibited thermal stability up to 214℃, whereas the dye doped crystals (SRB) showed thermal stability up to 260℃. The pure sulphamic acid crystal has a significant decrease in weight of 53% within the temperature range of 304–424℃, whereas the dye-doped crystal, within the temperature range of 369–426℃, shows a weight reduction of 62%. The dye-doped single crystal exhibits an enhancement in thermal stability. The enhanced thermal stability of the doped crystal renders it highly promising for optoelectronic applications.</p>

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Spectroscopic and thermal study of Rhodamine 6G dye doped sulphamic acid single crystals

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Rimple Saini,
  • David Joseph

摘要

Sulphamic acid (SA) and Rhodamine 6G dye doped sulphamic acid single crystals (SR6G) were grown from slow evaporation technique. Single crystal XRD confirms orthorhombic structure for grown crystal. Functional groups were determined and assigned by FTIR and Raman spectroscopy. Photoluminescence (PL) spectra had been recorded and Blue shifts were observed in the obtained photoluminescence spectra. The presence of dye molecules within the crystal lattice is confirmed by the peak observed at 542 nm in the photoluminescence spectra. Optical band gap is determined from UV-Vis absorption spectra for pure and dye doped crystals. From optical band gap relation (Tauc’s relation) 5.13 eV band gap for pure SA and 5.33 eV band gap for dye doped SA crystal was observed and found that optical band gap was increased due to incorporation of dye molecule in crystal structure. Optical band gap above 4 eV confirms that the synthesized crystals belongs to insulator materials. Behaviour of dye in aqueous solution was also compared with dye in crystal in absorption spectra. Thermo-gravimetric analysis (TGA) and differential thermo-gravimetric analysis (DTA) were conducted to verify the thermal stability of the crystal. The TGA-DTA analysis revealed that the pure sulphamic (SA) crystals exhibited thermal stability up to 214℃, whereas the dye doped crystals (SRB) showed thermal stability up to 260℃. The pure sulphamic acid crystal has a significant decrease in weight of 53% within the temperature range of 304–424℃, whereas the dye-doped crystal, within the temperature range of 369–426℃, shows a weight reduction of 62%. The dye-doped single crystal exhibits an enhancement in thermal stability. The enhanced thermal stability of the doped crystal renders it highly promising for optoelectronic applications.