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<p>This study focuses on the preparation and characterization of catalysts composed of iridium (Ir) and zirconium (Zr) supported on carbon nanotubes (CNTs) for use in a sensitive electrochemical sensor. The catalysts were synthesized using the NaBH<sub>4</sub> reduction method. The characterization of the Ir-Zr/CNT catalysts was performed using scanning electron microscopy and energy dispersive x-ray spectroscopy, as well as x-ray diffraction techniques. The Ir-Zr/CNT catalyst was then used to modify a glassy carbon electrode (GCE) to develop an electrochemical sensor for the detection of L-Tryptophan (L-Trp). The electrochemical performance of the sensor was evaluated using cyclic voltammetry, linear sweep voltammetry differential pulse voltammetry, and electrochemical impedance spectroscopy. The sensor, Ir-Zr/CNT-GCE, demonstrated excellent performance, including a linear response to L-Trp in the concentration range of 20–500&#xa0;<i>µ</i>M. The sensor exhibited a current sensitivity of 0.0003&#xa0;mA/<i>µ</i>M&#xa0;cm<sup>2</sup> and a detection limit of 0.06&#xa0;<i>µ</i>M, with a signal-to-noise ratio (S/N) of 3, indicating high sensitivity and effectiveness for L-Trp detection.</p>

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Development of an Electrochemical Sensor for L-Tryptophan Detection Using a Novel Iridium–Zirconium-Based Catalyst

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Omrüye Ozok Arıcı

摘要

This study focuses on the preparation and characterization of catalysts composed of iridium (Ir) and zirconium (Zr) supported on carbon nanotubes (CNTs) for use in a sensitive electrochemical sensor. The catalysts were synthesized using the NaBH4 reduction method. The characterization of the Ir-Zr/CNT catalysts was performed using scanning electron microscopy and energy dispersive x-ray spectroscopy, as well as x-ray diffraction techniques. The Ir-Zr/CNT catalyst was then used to modify a glassy carbon electrode (GCE) to develop an electrochemical sensor for the detection of L-Tryptophan (L-Trp). The electrochemical performance of the sensor was evaluated using cyclic voltammetry, linear sweep voltammetry differential pulse voltammetry, and electrochemical impedance spectroscopy. The sensor, Ir-Zr/CNT-GCE, demonstrated excellent performance, including a linear response to L-Trp in the concentration range of 20–500 µM. The sensor exhibited a current sensitivity of 0.0003 mA/µM cm2 and a detection limit of 0.06 µM, with a signal-to-noise ratio (S/N) of 3, indicating high sensitivity and effectiveness for L-Trp detection.