Laser-Induced Graphene Glucose Sensor with Electroless Plating
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Solution Overview
Problem
Current non-enzymatic glucose sensors face challenges in achieving high sensitivity for trace glucose detection in biofluids, particularly due to limitations in conductivity and mechanical robustness of laser-induced graphene (LIG) electrodes, and the need for a uniform metal coating process suitable for wearable applications.
Innovation Solution
A non-enzymatic glucose sensor is developed using a laser-induced graphene electrode with a uniform metal coating process via electroless plating, combined with a microfluidic channel and a reaction member with a porous polymer layer to enhance sensitivity and stability, while maintaining a pH environment that minimizes risk to patients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electroplating is used to coat metal on LIG electrodes, then metal coating can be achieved, but the coating is non-uniform and the process is time-consuming due to limited conductivity in porous 3D structure
Solution Approach 1:
The patent replaces the electroplating process (which relies on electrical current flow through the conductive structure) with a chemical deposition process. The metal coating is applied through chemical reactions that do not depend on the electrical conductivity of the porous LIG structure, thereby eliminating the time constraint and achieving uniform coating regardless of the substrate's conductive properties.
2Reliability
If LIG electrodes are clamped during electroplating to ensure stability, then positioning is improved, but LIG may fall off leading to electroplating failure
Solution Approach 1:
The patent eliminates the mechanical clamping step by replacing electroplating with chemical deposition. Since the new process does not require electrical current flow, there is no need to clamp the LIG electrode for electrical connection, thereby removing the source of the reliability problem while maintaining manufacturing simplicity.
3Strength
If binder materials are added to increase mechanical robustness of LIG, then structural strength is improved, but porous structure is blocked reducing sensing metal coverage and sensitivity
Solution Approach 1:
The patent replaces electroplating with chemical deposition, which allows metal coating to proceed without requiring the LIG structure to be mechanically clamped or reinforced with binders. The chemical deposition process can uniformly coat the porous structure while maintaining its open architecture, thereby achieving both mechanical integrity and maximum metal coverage without compromise.
4Measurement precision
If strong basic environment is used for non-enzymatic glucose sensing, then sensitivity is improved, but patient safety is compromised
Solution Approach 1:
The patent changes the pH parameter from strongly basic to mildly basic conditions. This parameter modification maintains the non-enzymatic glucose sensing mechanism and sensitivity while reducing the harmful effects on patients. The chemical deposition method enables this parameter change without compromising the sensing performance.
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 high sensitivity for glucose detection, with a linear range capable of covering glucose concentrations in sweat, tears, and saliva, and demonstrates stability and selectivity against interfering substances, making it suitable for wearable and on-body measurements.
Implementation Method 1
a uniform metal coating process via electroless plating
Implementation Method 2
Laser-induced graphene (LIG) displays porous structures
Implementation Method 3
laser-induced graphene electrode comprises one or more uniform coatings of metal
Implementation Method 4
glucose is oxidized by an oxidizer at the working electrode to give away electrons, leading to current flow with a magnitude directly proportional to the glucose concentration
Data Source
AI summary
Embodiments relate to a non-enzymatic glucose sensor. The non-enzymatic glucose sensor comprises one or more electrodes, a microfluidic channel, and at least one inlet, wherein the at least one inlet is configured to deliver a fluid to a microfluidic channel and wherein the microfluidic channel is configured to transport the fluid to the one or more electrodes. At least one of the one or more electrodes is a laser-induced graphene electrode, wherein the laser-induced graphene electrode comprises one or more uniform coatings of metal.