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<p>The growing environmental and clinical concerns associated with sneprin residues necessitate the development of rapid, cost-effective, and ultrasensitive detection strategies. To address this, N, P doped carbon quantum dots (NPCQDs) are derived from orange peel via a green hydrothermal approach, were integrated with manganese hexacyanoferrate (MnHCF) to fabricate a hybrid nanocomposite. The rationale behind this design lies in the synergistic combination of the redox-active centers of MnHCF with the high conductivity, abundant surface functional groups, and sustainable origin of NPCQDs, which overcomes the inherent drawbacks of pristine MnHCF such as low conductivity and limited stability. The resulting MnHCF/NPCQD hybrid was thoroughly characterized by XRD, FTIR, SEM, HRTEM with EDS and XPS analyses, confirming a crystalline MnHCF framework with uniformly distributed NPCQDs. Electrochemical investigations using CV, DPV, and EIS revealed enhanced redox activity, surface-controlled kinetics, and significantly reduced charge transfer resistance. The MnHCF/NPCQD-modified glassy carbon electrode exhibited a linear response range of 10–200 µL, high sensitivity of 1.37 µA/µL, and a low detection limit of 3.63 µL. Moreover, the sensor retained 93.8% of its initial response after 30 days, demonstrating excellent stability and reproducibility. This sustainable hybridization strategy highlights the potential of MnHCF/NPCQD as a high-performance electrochemical platform for real-time sneprin monitoring in pharmaceutical and environmental applications. </p>

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Synthesis of Orange Peel–Derived N and P Doped Carbon Quantum Dots/Manganese Hexacyanoferrate Nanocomposite for Ultrasensitive Detection of Sneprin

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. Sivagurunathan,
  • Maganti Syamala,
  • S. Asha,
  • Simon Deepa,
  • R. A. Kalaivani,
  • P. Siva Karthik

摘要

The growing environmental and clinical concerns associated with sneprin residues necessitate the development of rapid, cost-effective, and ultrasensitive detection strategies. To address this, N, P doped carbon quantum dots (NPCQDs) are derived from orange peel via a green hydrothermal approach, were integrated with manganese hexacyanoferrate (MnHCF) to fabricate a hybrid nanocomposite. The rationale behind this design lies in the synergistic combination of the redox-active centers of MnHCF with the high conductivity, abundant surface functional groups, and sustainable origin of NPCQDs, which overcomes the inherent drawbacks of pristine MnHCF such as low conductivity and limited stability. The resulting MnHCF/NPCQD hybrid was thoroughly characterized by XRD, FTIR, SEM, HRTEM with EDS and XPS analyses, confirming a crystalline MnHCF framework with uniformly distributed NPCQDs. Electrochemical investigations using CV, DPV, and EIS revealed enhanced redox activity, surface-controlled kinetics, and significantly reduced charge transfer resistance. The MnHCF/NPCQD-modified glassy carbon electrode exhibited a linear response range of 10–200 µL, high sensitivity of 1.37 µA/µL, and a low detection limit of 3.63 µL. Moreover, the sensor retained 93.8% of its initial response after 30 days, demonstrating excellent stability and reproducibility. This sustainable hybridization strategy highlights the potential of MnHCF/NPCQD as a high-performance electrochemical platform for real-time sneprin monitoring in pharmaceutical and environmental applications.