Molybdenum Cluster Optical Sensor for Oxygen Monitoring
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Solution Overview
Problem
Current oxygen sensors, particularly optical sensors, face limitations such as photobleaching, sensitivity to environmental factors, and inability to provide continuous real-time monitoring without data limitations, making them unsuitable for applications requiring high sensitivity, specificity, and stability in harsh conditions.
Innovation Solution
An optical sensor comprising a composite sensing film with molybdenum clusters dispersed in a photocured silicone polymer matrix, which is oxygen permeable, optically transparent, and chemically inert, allowing for long-term stability and resistance to photobleaching, and is used in conjunction with a waveguide system for guiding excitation and emission photons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current optical sensors use luminescent molecules embedded in a sensing film, then oxygen concentration can be measured through luminescence intensity or lifetime changes, but the sensors suffer from photobleaching degradation that limits the total number of measurements
Solution Approach 1:
The patent changes the fundamental parameter of the luminophore material from conventional organic dyes or metal complexes to molybdenum cluster compounds. This material parameter change results in enhanced photostability and elimination of photobleaching while maintaining oxygen sensitivity through phosphorescence quenching mechanisms.
Solution Approach 2:
The patent employs a composite sensing film structure comprising molybdenum cluster luminophores dispersed in a polymer matrix. This composite approach combines the oxygen-sensitive phosphorescent properties of molybdenum clusters with the mechanical stability and processability of polymer materials, achieving both measurement precision and long-term reliability.
2Productivity
If electrochemical sensors are used to measure oxygen, then continuous monitoring is possible, but they consume oxygen (the analyte being monitored) and drift over time
Solution Approach 1:
The patent replaces the electrochemical measurement mechanism with an optical measurement mechanism. Instead of using electrodes that consume oxygen through electrochemical reactions, the system uses optical excitation and phosphorescence detection, eliminating analyte consumption while maintaining continuous monitoring capability.
Solution Approach 2:
The patent introduces phosphorescence as an intermediary mechanism between oxygen detection and signal generation. The molybdenum clusters act as intermediaries that transfer oxygen concentration information to optical signals without consuming oxygen, unlike direct electrochemical reduction at cathodes.
3Measurement precision
If optical sensors use conventional luminescent molecules, then oxygen measurement is achievable, but the sensors exhibit photobleaching that forces a choice between frequent measurements over short periods or sparse data collection over long periods
Solution Approach 1:
The patent fundamentally changes the photophysical parameters of the luminophore by using molybdenum cluster compounds with phosphorescence properties instead of conventional fluorescent molecules. This results in long phosphorescence lifetimes (hundreds of microseconds to milliseconds) and complete elimination of photobleaching, enabling unlimited continuous measurements.
Solution Approach 2:
The patent achieves continuous operational capability by eliminating photobleaching degradation. The molybdenum cluster-based sensor can perform unlimited measurements over extended periods without signal degradation, removing the trade-off between measurement frequency and operational duration present in conventional sensors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sensor achieves continuous, real-time monitoring of oxygen with minimal photobleaching, high sensitivity, and resistance to environmental factors like pH and salinity, enabling reliable operation over extended periods without significant degradation.
Implementation Method 1
optical sensor for oxygen measurement comprising a composite sensing film containing luminophores dispersed in a polymer matrix; a source of photons for photoexciting the luminophores
Implementation Method 2
a waveguide, transparent in the frequency range of the excitation photons, for guiding the excitation photons from the source to the composite sensing film
Implementation Method 3
a waveguide, transparent in the frequency range of the emitted photons, for guiding the emitted photons from the composite sensing film to the detector
Data Source
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AI summary
A composite comprises a polymer matrix and a luminophore dispersed therein. The composite is useful as a sensing film that is used as an optical sensor for oxygen measurement comprising the composite sensing film; a source of photons for photoexciting the luminophores and a waveguide, transparent in the frequency range of the excitation photons, for guiding the excitation photons from the source to the composite sensing film; a detector for measuring properties of photons emitted from the luminophores. A system including a computer may be useful for coordinating the activities of the sensor.