Novel hybrid optical sensor materials for in-breath O(2) analysis

Area of Science:

• Materials Science
• Chemical Sensors
• Biomedical Engineering

Background:

• Accurate oxygen (O(2)) monitoring is crucial for human health applications.
• Organically Modified Silicate (ORMOSIL) hybrid sensor films offer potential for real-time O(2) detection.
• Luminescence quenching of ruthenium complexes is a viable sensing mechanism for O(2).

Purpose of the Study:

• To optimize and characterize novel ORMOSIL-based hybrid sensor films for breath O(2) detection.
• To select the most suitable ORMOSIL material for breath monitoring based on key performance parameters.
• To investigate the influence of organosilicon precursors on film properties and O(2) sensing capabilities.

Main Methods:

• Fabrication of ORMOSIL-based sensor films using various organosilicon precursors (methyl-, ethyl-, n-propyl-, phenyltriethoxysilane).
• Characterization of films for O(2) sensitivity, response time, and humidity interference.
• Utilized phase fluorometry with blue LED excitation and photodiode detection for O(2) measurement.
• Optimized film polarity (hydrophobicity) and O(2) sensitivity.

Main Results:

• Identified n-propyltriethoxysilane-derived ORMOSIL films as optimal for breath O(2) analysis.
• The selected platform demonstrated a short response time and negligible humidity interference.
• Achieved suitable O(2) sensitivity within the relevant physiological range for breath monitoring.
• Confirmed compatibility with a single-point calibration strategy.

Conclusions:

• ORMOSIL-based hybrid sensor films, particularly those derived from n-propyltriethoxysilane, are highly promising for non-invasive, breath-by-breath O(2) monitoring.
• The optimized sensor platform offers a robust solution with rapid response and minimal environmental interference.
• This technology has significant potential for advancing human health monitoring applications through real-time O(2) analysis.