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<p>A simple and economical method for fabricating a fluorescent biosensor using graphene quantum dots (GQDs) is introduced for agricultural applications. GQDs were prepared from sucrose via the pyrolysis process, and their optical properties and morphology were characterized by XRD, FTIR, SEM, TEM, UV–visible spectroscopy, and photoluminescence spectroscopy. The results revealed that the GQDs were spherical, with an average size of diameter of 5&#xa0;nm. UV–Vis analyses showed characteristic absorption at 200 and 278&#xa0;nm. To assess the biosensor's performance in nitrogen detection, GQD solutions were mixed with nitrogen solutions of varying concentrations. The PL spectra demonstrated a significant increase in fluorescence intensity with rising nitrogen concentrations. These findings highlight the potential of GQD-based fluorescent biosensors as an effective and alternative method for detecting essential soil nutrients.</p>

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A green synthesized highly fluorescent graphene quantum dots as sensor for detection of urea fertilizer

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Rubika Kumar,
  • Basma Fathima,
  • Srimathi Krishnaswamy

摘要

A simple and economical method for fabricating a fluorescent biosensor using graphene quantum dots (GQDs) is introduced for agricultural applications. GQDs were prepared from sucrose via the pyrolysis process, and their optical properties and morphology were characterized by XRD, FTIR, SEM, TEM, UV–visible spectroscopy, and photoluminescence spectroscopy. The results revealed that the GQDs were spherical, with an average size of diameter of 5 nm. UV–Vis analyses showed characteristic absorption at 200 and 278 nm. To assess the biosensor's performance in nitrogen detection, GQD solutions were mixed with nitrogen solutions of varying concentrations. The PL spectra demonstrated a significant increase in fluorescence intensity with rising nitrogen concentrations. These findings highlight the potential of GQD-based fluorescent biosensors as an effective and alternative method for detecting essential soil nutrients.