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This study presents the synthesis of a Pt/TiO2 nanocomposite via the sol–gel method, using titanium isopropoxide and chloroplatinic acid as precursors. Structural characterization performed using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and UV–visible diffuse reflectance spectroscopy confirmed uniform Pt dispersion and strong Pt/TiO2 interfacial interaction. The structural results further revealed that the Pt nanoparticles ranged from 2–5 nm, while the Pt/TiO2 composite crystallite sizes were 27–32 nm. The nanocomposite exhibited significantly enhanced photocatalytic activity and improved selectivity for glucose oxidation under visible light compared with pure TiO2. Electrochemical analysis demonstrated excellent non-enzymatic glucose sensing performance, characterized by a broad linear range of 0–100 mM, a low limit of detection of 6.8 mM, and reduced charge-transfer resistance. The Rct values for Pt, Pt/TiO2, and TiO2 electrodes were 101 Ω, 12 Ω, and 5 Ω, respectively, highlighting the superior charge-transfer properties of the composite. These findings underscore the synergistic effect of Pt and TiO2 nanostructures in enhancing electrocatalytic activity and charge transfer, establishing the Pt/TiO2 nanocomposite as a promising platform for stable, highly sensitive, and selective electrochemical glucose sensing applications.

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Pt/TiO2 Nanocomposite Electrodes with Improved Electrochemical Performance for Non-Enzymatic Glucose Sensing Applications

  • 会议论文

  • 发表日期：

    2026年

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  • Linah Twala,
  • Teboho C. Mokhena,
  • Bulelwa Ntsendwana,
  • Joseph Moema,
  • Mathato Motaung,
  • Sadiq A. Raji,
  • Abimbola P. I. Popoola

摘要

This study presents the synthesis of a Pt/TiO2 nanocomposite via the sol–gel method, using titanium isopropoxide and chloroplatinic acid as precursors. Structural characterization performed using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and UV–visible diffuse reflectance spectroscopy confirmed uniform Pt dispersion and strong Pt/TiO2 interfacial interaction. The structural results further revealed that the Pt nanoparticles ranged from 2–5 nm, while the Pt/TiO2 composite crystallite sizes were 27–32 nm. The nanocomposite exhibited significantly enhanced photocatalytic activity and improved selectivity for glucose oxidation under visible light compared with pure TiO2. Electrochemical analysis demonstrated excellent non-enzymatic glucose sensing performance, characterized by a broad linear range of 0–100 mM, a low limit of detection of 6.8 mM, and reduced charge-transfer resistance. The Rct values for Pt, Pt/TiO2, and TiO2 electrodes were 101 Ω, 12 Ω, and 5 Ω, respectively, highlighting the superior charge-transfer properties of the composite. These findings underscore the synergistic effect of Pt and TiO2 nanostructures in enhancing electrocatalytic activity and charge transfer, establishing the Pt/TiO2 nanocomposite as a promising platform for stable, highly sensitive, and selective electrochemical glucose sensing applications.