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<p>In the present study, fluorescent carbon dots (CDs) have been bioengineered using seaweed <i>Halimeda opuntia</i> through an eco-friendly hydrothermal approach and reported here for the first time. The physicochemical properties of CDs were analysed using XRD, FT-IR, TEM-EDAX, UV-VIS, PL, Raman and Z-scan studies. From XRD pattern the broad diffraction peak at 2θ = 24.31<sup>°</sup> confirms the occurrence of amorphous carbon with a graphite-like structure. The optical absorption studies confirmed the presence of π- π* electron transfer of the conjugate C =C due to the absorption peak at around 260&#xa0;nm. FTIR analysis showed the presence of functional groups which are responsible for the formation of CDs using <i>Halimeda opuntia</i> seaweed. From Z – scan analysis, the nonlinear optical (NLO) properties of CDs were studied.</p>

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One-pot green synthesis of blue light-emitting carbon dots using seaweed Halimeda opuntia and their photoluminescent properties

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Sekaran Muthamil Selvan,
  • Kabali Vijai Anand,
  • Kasivelu Govindaraju,
  • Gandhirajan Vinitha,
  • Ashok K. Sundramoorthy,
  • Kalimuthu Raja,
  • Manoharan Latha

摘要

In the present study, fluorescent carbon dots (CDs) have been bioengineered using seaweed Halimeda opuntia through an eco-friendly hydrothermal approach and reported here for the first time. The physicochemical properties of CDs were analysed using XRD, FT-IR, TEM-EDAX, UV-VIS, PL, Raman and Z-scan studies. From XRD pattern the broad diffraction peak at 2θ = 24.31° confirms the occurrence of amorphous carbon with a graphite-like structure. The optical absorption studies confirmed the presence of π- π* electron transfer of the conjugate C =C due to the absorption peak at around 260 nm. FTIR analysis showed the presence of functional groups which are responsible for the formation of CDs using Halimeda opuntia seaweed. From Z – scan analysis, the nonlinear optical (NLO) properties of CDs were studied.