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Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gas.

Gi-Hwan Lim¹, In-Yea Kim¹, Ji-Young Park²

¹Department of Materials Science and Engineering, Gachon University, Seongnam-si 13120, Republic of Korea.

Nanomaterials (Basel, Switzerland)

|January 11, 2024

Summary

This study introduces a new capacitive sensor for detecting alcohol excreted through the skin. The sensor uses hydrophobically treated anodic aluminum oxide (AAO) for improved epidermal alcohol detection.

Keywords:

AAO capacitive sensor sensor surface modification

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Area of Science:

Materials Science
Sensor Technology
Biomedical Engineering

Background:

Breath tests are standard for alcohol analysis, but a small percentage of alcohol is excreted through the skin.
Detecting transdermal alcohol offers an alternative or supplementary method for alcohol monitoring.

Purpose of the Study:

To develop and validate a novel capacitive sensor for detecting alcohol excreted via the epidermis.
To optimize the hydrophobic treatment of anodic aluminum oxide (AAO) for enhanced sensor performance.

Main Methods:

Fabrication of a capacitive sensor utilizing hydrophobically modified anodic aluminum oxide (AAO).
Treatment of AAO with 3-aminopropyltriethoxysilane vapor to introduce Si-NH2 functional groups, optimizing exposure time to 60 minutes.
Evaluation of sensor sensitivity to moisture and ethanol after hydrophobic treatment.

Main Results:

Optimal hydrophobicity achieved with a 60-minute exposure to 3-aminopropyltriethoxysilane vapor.
Hydrophobized AAO exhibited a minimal 4.8% reduction in moisture sensitivity.
The sensor demonstrated a low 12% decrease in ethanol sensitivity, indicating effective alcohol detection.
Successful integration and operation of the sensor with an ankle-type breathalyzer.

Conclusions:

A novel capacitive sensor based on hydrophobically treated AAO effectively detects epidermal alcohol excretion.
The optimized hydrophobic treatment enhances sensor stability and maintains high sensitivity to ethanol.
This technology presents a promising alternative for non-invasive alcohol monitoring.