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<p>In this work, Carbon Quantum Dots (CQDs) were successfully prepared from sugarcane bagasse pulp using a convenient hydrothermal method, showcasing the viability of agricultural waste as a sustainable precursor. Fourier-transform infrared spectroscopy validated the surface functionalities, whereas X-ray diffraction analysis and Transmission Electron Microscopy elucidated the presence of 3.8&#xa0;nm graphitic cores. Dynamic light scattering confirmed a hydrodynamic size of 8–12&#xa0;nm with a narrow distribution. Optical analysis indicated a bandgap of 4.97&#xa0;eV and an Urbach energy of 0.629&#xa0;eV, suggesting significant quantum confinement and the presence of defect states. The CQDs exhibited an excitation-dependent photoluminescence emission, revealing a gradual red shift in the blue emission band (417–478&#xa0;nm), corroborated by CIE chromaticity mapping. Electrochemical impedance spectroscopy demonstrated significant charge transfer resistance and diffusion-controlled processes, confirming the electroactive potential of CQDs. These properties distinguish sugarcane bagasse-derived CQDs from previously reported biomass-CQDs and demonstrate their potential for optoelectronic devices and sustainable nanotechnology.</p>

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Synthesis, optoelectronic, and electrochemical characteristics of biomass-derived carbon quantum dots

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • J. Sherin Percy Prema Leela,
  • P. Jesu Jayarin,
  • M. Ramesh Babu,
  • Santosh Kumar Nathsharma,
  • Helen Merina Albert

摘要

In this work, Carbon Quantum Dots (CQDs) were successfully prepared from sugarcane bagasse pulp using a convenient hydrothermal method, showcasing the viability of agricultural waste as a sustainable precursor. Fourier-transform infrared spectroscopy validated the surface functionalities, whereas X-ray diffraction analysis and Transmission Electron Microscopy elucidated the presence of 3.8 nm graphitic cores. Dynamic light scattering confirmed a hydrodynamic size of 8–12 nm with a narrow distribution. Optical analysis indicated a bandgap of 4.97 eV and an Urbach energy of 0.629 eV, suggesting significant quantum confinement and the presence of defect states. The CQDs exhibited an excitation-dependent photoluminescence emission, revealing a gradual red shift in the blue emission band (417–478 nm), corroborated by CIE chromaticity mapping. Electrochemical impedance spectroscopy demonstrated significant charge transfer resistance and diffusion-controlled processes, confirming the electroactive potential of CQDs. These properties distinguish sugarcane bagasse-derived CQDs from previously reported biomass-CQDs and demonstrate their potential for optoelectronic devices and sustainable nanotechnology.