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Sol-gel-derived sensor materials that yield linear calibration plots, high sensitivity, and long-term stability
Ying Tang1, Elizabeth C Tehan, Zunyu Tao
1Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA.
Analytical Chemistry
|August 16, 2003
Summary
Novel oxygen sensors utilize composite xerogel films for enhanced performance. These materials demonstrate superior sensitivity and long-term stability compared to traditional sensors, offering reliable O2 detection.
Area of Science:
- Materials Science
- Chemical Sensors
- Nanotechnology
Background:
- Oxygen sensors are crucial for various applications, but often suffer from limited sensitivity and stability.
- Ruthenium(II) complexes are known for their luminescence properties, making them suitable for optical sensing.
- Xerogel matrices offer a versatile platform for immobilizing sensing materials.
Purpose of the Study:
- To synthesize and investigate novel O2-sensing materials based on n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogel films.
- To evaluate the performance of these composite xerogels doped with tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)3]2+) as O2 sensors.
- To understand the structural and analytical factors contributing to the sensors' performance and stability.
Main Methods:
- Synthesis of spin-coated Octyl-triEOS/TEOS composite xerogel films.
- Incorporation of [Ru(dpp)3]2+ as the O2-sensitive luminescent probe.
- Characterization using scanning electron microscopy (SEM) for film morphology.
- Luminescence measurements (steady-state and time-resolved) for analytical performance evaluation.
Main Results:
- Uniform, crack-free xerogel films were successfully fabricated using specific Octyl-triEOS/TEOS compositions.
- The [Ru(dpp)3]2+-doped composite xerogels exhibited high sensitivity to O2.
- Sensors based on 50 mol % Octyl-triEOS showed over 4-fold greater sensitivity than pure TEOS sensors after 11 months.
- Pure TEOS sensors experienced a >400% drop in sensitivity over 11 months, while 50 mol % Octyl-triEOS sensors remained stable (RSD = 4%).
Conclusions:
- Composite xerogel films incorporating Octyl-triEOS and TEOS are promising materials for developing high-performance oxygen sensors.
- The addition of Octyl-triEOS significantly enhances the long-term stability and sensitivity of [Ru(dpp)3]2+-based O2 sensors.
- These novel materials offer a robust platform for reliable and stable optical oxygen sensing applications.