Core-shell nanofiber sensors for non-invasive oxygen monitoring
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Solution Overview
Problem
Conventional oxygen sensors are invasive, consume oxygen during measurement, difficult to miniaturize, and cannot provide real-time, 2D or 3D oxygen distribution data in heterogeneous systems, limiting their application in biological environments where sensitive and non-invasive monitoring is required.
Innovation Solution
Development of nanofiber-based sensors with core-shell structures, where the core contains a polymer with a dispersed sensor and the shell is made of another polymer, allowing for rapid oxygen diffusion and detection, enabling real-time monitoring of oxygen levels without consuming oxygen or causing electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Clark electrodes are used for oxygen sensing, then oxygen measurement is achieved, but the sensors consume oxygen during measurements and are invasive
Solution Approach 1:
The patent replaces the electrochemical Clark electrode system with an optical sensing system based on luminescence quenching. The optical sensor uses luminescent probes (organometallic complexes or metalloporphyrins) embedded in a polymer matrix that respond to oxygen concentration through changes in luminescence intensity or lifetime, eliminating the need for electrical components and oxygen-consuming electrochemical reactions. This substitution resolves the contradiction by providing oxygen measurement without consumption and without invasiveness.
Solution Approach 2:
The patent employs a porous polymer matrix structure that allows oxygen diffusion while protecting the luminescent probes. The porous structure enables rapid oxygen transport to the sensing sites while the polymer matrix provides mechanical support and prevents probe leaching. This resolves the contradiction by enabling non-invasive measurement through the porous barrier that does not consume oxygen.
2Object-affected harmful factors
If optical sensors based on luminescence quenching are used, then non-invasive oxygen sensing is achieved, but response times are longer due to 2D configuration limiting surface area
Solution Approach 1:
The patent transitions from a 2D film configuration to a 3D nanofiber structure. The nanofibers provide a three-dimensional sensing volume with significantly increased surface area to volume ratio, enabling rapid oxygen diffusion from all directions to the luminescent probes distributed throughout the fiber volume. This dimensional change resolves the contradiction by maintaining non-invasive optical sensing while dramatically accelerating response time through enhanced surface area availability.
Solution Approach 2:
The patent utilizes a porous polymer matrix within the nanofiber structure that facilitates rapid oxygen diffusion. The porous architecture provides multiple diffusion pathways and reduces diffusion distances, allowing oxygen to quickly reach the luminescent probes throughout the 3D structure. This resolves the contradiction by enabling fast response times while maintaining the non-invasive optical sensing modality.
3Reliability
If molecular probes are doped within protective polymer matrix films, then mechanical support and selectivity are improved, but sensitivity to low oxygen concentrations is reduced
Solution Approach 1:
The patent transforms the 2D film structure into 3D nanofibers with extremely high surface area to volume ratios. This dimensional change allows the luminescent probes to be distributed throughout a three-dimensional space, increasing the number of active sensing sites accessible to oxygen molecules. The enhanced surface area compensates for the protective polymer matrix, maintaining mechanical support and selectivity while improving sensitivity to low oxygen concentrations through increased probe accessibility.
Solution Approach 2:
The patent employs a composite material system consisting of luminescent probes (organometallic complexes or metalloporphyrins) embedded in a porous polymer matrix within a nanofiber structure. The composite architecture combines the mechanical support and selectivity of the polymer matrix with the high sensitivity of the luminescent probes. The porous structure and 3D nanofiber configuration ensure that the polymer matrix does not hinder oxygen access to the probes, resolving the contradiction between protective encapsulation and sensing sensitivity.
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 nanofiber-based sensors are sensitive, non-invasive, and can detect low oxygen concentrations rapidly, making them suitable for biological applications, including real-time monitoring of oxygen levels in complex environments.
Implementation Method 1
optical sensors based on luminescence quenching of oxygen sensitive probes
Implementation Method 2
rapid oxygen diffusion
Data Source
AI summary
Nanofiber-based sensors for the rapid detection, identification, and/or quantification of analytes, including gaseous analytes such as oxygen, are provided. The nanofiber-based sensors can comprise core-shell nanofibers. The core-shell nanofibers can comprise (a) a core comprising a first polymer and an sensor dispersed therein; and (b) a shell disposed coaxially around the core, comprising a second polymer.