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<p>The Pd-MnO<sub>2</sub> nanoparticles attached to carbon quantum dots nanocomposite were synthesized using the green synthesis and hydrothermal process. Characterization of the as-prepared nanocomposite was intensively performed by FT-IR, powder XRD, XPS, and HR-TEM analysis. The synthesized nanomaterial was further examined for its selective and sensitive ascorbic acid (ASA) sensing using a Pd-MnO<sub>2</sub>@CQD modified glassy carbon electrode (GCE). The Pd-MnO<sub>2</sub>@CQD nanocomposite exhibits a distinct and improved peak current of ASA when compared to electrodes treated with Pd-MnO<sub>2</sub> and bare GCE. The designed sensor has excellent performance, with a linear range of 10–1500&#xa0;μM, a low detection limit of 0.14&#xa0;μM (S/N = 3), a high sensitivity of 1.9671 μAµM<sup>−1</sup>&#xa0;cm<sup>−2</sup>. Furthermore, the constructed sensor demonstrates good sensitivity for detecting ASA in a variety of real samples.</p> Graphical Abstract <p></p>

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Highly sensitive electrochemical sensing of ascorbic acid (vitamin C) using Pd-doped MnO2 supported on carbon quantum dots (Pd-MnO2@CQD) in water and fruit juices

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Deepak Kumar,
  • Daraksha Bano,
  • Subhash Chandra,
  • Bharat Kumar,
  • Vivek Kumar,
  • Pradeep Kumar Yadav,
  • Syed Hadi Hasan

摘要

The Pd-MnO2 nanoparticles attached to carbon quantum dots nanocomposite were synthesized using the green synthesis and hydrothermal process. Characterization of the as-prepared nanocomposite was intensively performed by FT-IR, powder XRD, XPS, and HR-TEM analysis. The synthesized nanomaterial was further examined for its selective and sensitive ascorbic acid (ASA) sensing using a Pd-MnO2@CQD modified glassy carbon electrode (GCE). The Pd-MnO2@CQD nanocomposite exhibits a distinct and improved peak current of ASA when compared to electrodes treated with Pd-MnO2 and bare GCE. The designed sensor has excellent performance, with a linear range of 10–1500 μM, a low detection limit of 0.14 μM (S/N = 3), a high sensitivity of 1.9671 μAµM−1 cm−2. Furthermore, the constructed sensor demonstrates good sensitivity for detecting ASA in a variety of real samples.

Graphical Abstract