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Ultrasensitive Nonenzymatic Real-Time Hydrogen Peroxide Monitoring Using Gold Nanoparticle-Decorated Titanium Dioxide

Md Ashraful Kader1, Nina Suhaity Azmi1, A K M Kafi2

  • 1Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Kuantan 26300, Malaysia.

Biosensors
|July 28, 2023
PubMed
Summary

A novel enzyme-free sensor for hydrogen peroxide (H2O2) detection was created using gold nanoparticles on titanium dioxide nanotubes. This sensor offers high sensitivity and stability for various real-world applications.

Keywords:
amperometryelectrochemical H2O2 sensorgold nanoparticlesnonenzymatic detectiontitanium dioxide nanotube

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Area of Science:

  • Electrochemistry
  • Nanomaterials Science
  • Analytical Chemistry

Background:

  • Hydrogen peroxide (H2O2) is a key analyte in biological and environmental systems.
  • Enzyme-based sensors often face limitations like instability and high cost.
  • Development of robust, enzyme-free sensors is crucial for practical H2O2 detection.

Purpose of the Study:

  • To develop a sensitive and stable amperometric enzyme-free sensor for hydrogen peroxide (H2O2).
  • To utilize gold nanoparticles (Au NPs) stabilized on porous titanium dioxide nanotubes (TiO2 NTs) for enhanced sensing performance.

Main Methods:

  • Fabrication of a composite electrode by immobilizing 4-5 nm Au NPs onto porous TiO2 NTs.
  • Characterization of the electrode using cyclic voltammetry to assess H2O2 electrocatalytic reduction.
  • Evaluation of sensor performance including linearity, detection limit, sensitivity, selectivity, reproducibility, repeatability, and stability.

Main Results:

  • The composite electrode exhibited efficient electrocatalytic reduction of H2O2.
  • The sensor demonstrated a wide linear range, a low detection limit (~104 nM), and high sensitivity (~519 µA/mM).
  • Excellent selectivity, reproducibility, repeatability, and stability over 60 days were achieved, with good recovery in real samples.

Conclusions:

  • The developed Au NPs/TiO2 NTs composite electrode is a promising platform for a highly sensitive and stable enzyme-free H2O2 sensor.
  • The sensor's performance in real samples (tap water, milk, bacteria) validates its accuracy and potential for practical applications.
  • This nonenzymatic approach offers a robust alternative for H2O2 monitoring.