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Electrochemical Hydrogen Peroxide Sensor Based on Macroporous Silicon.

Naif H Al-Hardan1, Muhammad Azmi Abdul Hamid2, Roslinda Shamsudin3

  • 1School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Malaysia. naif@ukm.edu.my.

Sensors (Basel, Switzerland)
|March 3, 2018
PubMed
Summary

Researchers developed macroporous silicon sensors for detecting hydrogen peroxide (H₂O₂). These sensors offer a rapid, stable, and sensitive method for industrial and environmental H₂O₂ monitoring.

Keywords:
amperometric sensorselectrochemical sensorshydrogen peroxidemacroporous silicon

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Macroporous silicon (MPS) is a versatile material with tunable properties.
  • Hydrogen peroxide (H₂O₂) is a key analyte in various industrial and environmental applications.
  • Development of sensitive and stable H₂O₂ sensors is crucial for accurate monitoring.

Purpose of the Study:

  • To fabricate and characterize macroporous silicon-based sensors.
  • To evaluate the sensing performance of MPS for hydrogen peroxide detection.
  • To assess the stability and response time of the developed H₂O₂ sensor.

Main Methods:

  • Macroporous silicon was fabricated using a controlled anodization process.
  • The sensor's electrochemical response to varying hydrogen peroxide concentrations (10–5000 μM) was measured.
  • Pore size, depth, sensitivity, detection limit, and stability were analyzed.

Main Results:

  • The MPS exhibited an average pore size of 4–6 μm and a depth of ~80 μm.
  • A linear response to H₂O₂ was observed with a sensitivity of 0.55 μA μM⁻¹∙cm⁻².
  • The sensor demonstrated a low detection limit of 4.35 μM, rapid response time (~2 s), and good stability over one month.

Conclusions:

  • Macroporous silicon is a promising material for developing electrochemical sensors.
  • The fabricated MPS sensor shows excellent performance for H₂O₂ detection in industrial and environmental settings.
  • The sensor's rapid response, high sensitivity, and stability make it suitable for practical applications.