Humidity-Resistant Pt/CrVN₂ Fuel Cell Sensor for H₂S Biomarker Detection

Area of Science:

• Materials Science
• Electrochemistry
• Biomedical Engineering

Background:

• Real-time biomarker monitoring is crucial for personalized diagnostics.
• Hydrogen sulfide (H₂S) is a key biomarker for oral diseases.
• Detecting low concentrations of H₂S in humid environments is challenging.

Purpose of the Study:

• To develop a highly sensitive and humidity-resistant H₂S sensor.
• To enable real-time, remote monitoring of H₂S biomarkers.
• To create a practical system for breath diagnosis in smart healthcare.

Main Methods:

• Fabrication of a platinum-loaded chromium vanadium nitride (Pt/CrVN₂) fuel cell-type H₂S sensor.
• Evaluation of sensor performance, including detection limits, response time, and selectivity.
• Testing sensor stability across a wide range of relative humidity (9%-79%).
• Development and validation of a wireless detection system for breath analysis.

Main Results:

• The Pt/CrVN₂ sensor achieved ultralow detection limits (50 ppb) with rapid response (4 s).
• The sensor demonstrated exceptional selectivity and high resistance to humidity.
• Stable performance was maintained across a broad humidity range (9%-79%).
• A wireless system was successfully validated for practical breath diagnosis.

Conclusions:

• The Pt/CrVN₂ sensor is a promising platform for sensitive, real-time biomarker detection.
• This technology advances next-generation medical diagnostics, particularly in smart healthcare.
• The sensor's humidity resistance overcomes a significant challenge in biomarker monitoring.