Silica Nanofiber pH Sensor with Ratiometric Dyes
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Solution Overview
Problem
Current sensors, particularly pH sensors, face limitations in real-time monitoring and precision measurements, especially in small volumes, due to issues like slow drift, limited accessibility, and inherent measurement errors, and existing optical pH sensors are susceptible to environmental factors affecting accuracy.
Innovation Solution
The use of silica nanofibers with detection particles that exhibit changes in optical properties upon interaction with analytes or environmental conditions, such as pH, allowing for ratiometric measurements through a combination of pH-responsive and reference dyes, enabling accurate and reliable sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensors are used for pH monitoring, then they can provide basic measurement capability, but they suffer from slow drift, limited accessibility, and inherent measurement errors that reduce reliability
Solution Approach 1:
The patent employs ratiometric measurements by changing the measurement parameter from single-intensity detection to ratio-based detection. Two dyes with different pH responses (one pH-responsive and one reference) are used, and their intensity ratio provides a drift-free measurement that eliminates the slow drift and inherent errors of conventional single-parameter sensors.
Solution Approach 2:
The invention uses composite nanofiber structures containing multiple dyes embedded within a single sensor matrix. This composite approach integrates both pH-responsive and reference dyes in close proximity, enabling simultaneous detection and ratio calculation that improves both reliability and precision compared to conventional separate sensor systems.
2Measurement precision
If conventional optical sensors are used, then they can detect analytes, but they are susceptible to environmental factors and photobleaching that affect accuracy over time
Solution Approach 1:
The reference dye acts as an internal feedback mechanism that compensates for environmental variations and photobleaching effects. By continuously monitoring the ratio between pH-responsive and reference dye signals, the system automatically corrects for drift and degradation, maintaining accurate measurements over extended periods.
Solution Approach 2:
The sensor performs self-calibration through ratiometric measurement, where the reference dye provides an internal standard that eliminates the need for external calibration. This self-service capability allows the sensor to maintain precision without external intervention, improving both accuracy and long-term durability.
3Adaptability or versatility
If single-parameter sensors are used, then they can provide simple measurement, but they lack multiplex sensing capability to detect different analytes and environmental conditions simultaneously
Solution Approach 1:
The nanofiber sensor achieves multi-functionality by embedding multiple dyes with different sensing capabilities within a single universal platform. This allows simultaneous detection of pH and other analytes through ratiometric measurements, providing multiplex sensing capability without requiring multiple separate sensor devices.
Solution Approach 2:
The invention merges multiple sensing functions into a single integrated nanofiber structure. By combining pH-responsive and reference dyes in one sensor matrix, the system achieves multiplex capability while minimizing structural complexity compared to using multiple separate 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
This approach enables real-time, continuous, and precise monitoring of pH values with improved accuracy and stability, reducing the influence of environmental factors and photobleaching, and allowing for long-term durability and multiplex sensing capabilities.
Implementation Method 1
the change in property includes, without limitation, a change in optical intensity, a change in emission wavelength peak, a change in emission wavelength phase, fluorescence resonance energy transfer (FRET)
Implementation Method 2
a shift in localized surface plasmonic resonances (LSPR)
Data Source
AI summary
Embodiments of the present disclosure pertain to a composition that includes: silica nanofibers; and one or more detection particles associated with the silica nanofibers. Additional embodiments of the present disclosure pertain to methods of sensing one or more analytes and/or one or more environmental conditions from a sample by associating the sample with a composition of the present disclosure; detecting a change in a property of the detection particles; and correlating the change in the property of the detection particles to a presence or absence of one or more analytes, one or more environmental conditions, or combinations thereof. Further embodiments of the present disclosure pertain to methods of making the compositions of the present disclosure by growing silica nanofibers from at least one precursor material; and associating one or more detection particles with the silica nanofibers.