MoO3-CoOOH Composite Glucose Sensor for Stable Enzyme-Free Detection
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Solution Overview
Problem
Existing electrochemical glucose sensors face challenges with enzyme instability, high cost, and complex fabrication processes, limiting their sensitivity and stability.
Innovation Solution
A composite of planar molybdenum oxide microstructures and cobalt oxyhydroxide microstructures is formed through a specific method, which is then used in an enzyme-free electrochemical sensor, providing high stability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If enzymatic sensors are used for glucose detection, then sensitivity is improved, but stability deteriorates due to enzyme fragility
Solution Approach 1:
The patent extracts the sensing function from enzymes by using non-enzymatic metal oxide materials (MoO3 and CoOOH) that can detect glucose through electrochemical reactions without requiring biological catalysts, thereby eliminating the stability issues associated with enzyme fragility while maintaining sensitivity
Solution Approach 2:
The patent creates a composite structure combining MoO3 microstructures with CoOOH nanoparticles, where the composite material synergistically enhances both sensitivity and stability compared to individual materials, achieving high performance without enzymatic components
2Ease of manufacture
If nanostructured metal oxides like MoO3 are used, then cost is reduced, but sensitivity deteriorates
Solution Approach 1:
The patent combines MoO3 microstructures with CoOOH nanoparticles to create a composite that enhances sensitivity beyond what MoO3 alone can achieve, while maintaining the cost-effectiveness of non-precious metal materials
Solution Approach 2:
The patent applies CoOOH nanoparticles specifically on the surface of MoO3 microstructures, creating local active sites with high catalytic activity for glucose oxidation, thereby enhancing sensitivity at critical locations without compromising overall cost-effectiveness
3Reliability
If MoO3 is used in electrochemical sensing, then stability is improved, but sensitivity deteriorates due to low electrocatalytic activity
Solution Approach 1:
The patent creates a composite where CoOOH nanoparticles are deposited on MoO3 microstructures, combining the stability of MoO3 with the high electrocatalytic activity of CoOOH, thereby achieving both stability and enhanced sensitivity simultaneously
Solution Approach 2:
The patent changes the surface properties and electrocatalytic parameters of MoO3 by introducing CoOOH nanoparticles, which modifies the electrochemical response and enhances sensitivity while preserving the underlying stability of the MoO3 structure
4Stability of the object's composition
If MoO3 is used for glucose sensing, then material stability is improved, but aggregation occurs leading to decreased performance
Solution Approach 1:
The patent uses CoOOH nanoparticles as surface decorations on MoO3 microstructures, creating localized active regions that prevent aggregation of MoO3 particles and maintain dispersed, high-performance sensing sites throughout the composite structure
Solution Approach 2:
The patent forms a composite structure where CoOOH nanoparticles act as spacers and active sites that prevent MoO3 microstructures from aggregating, thereby maintaining both material stability and high sensitivity through controlled morphology
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 composite sensor achieves a glucose detection limit of 10 to 100 μM with a sensitivity of 4 to 8 μA mM−1 cm−2 and a rapid response time, overcoming the limitations of enzyme-based sensors.
Implementation Method 1
Electrochemical sensing is one of the most convenient and effective glucose sensing techniques
Implementation Method 2
MoO3 has been used in applications including smart windows, optical devices, electrochemical storage, sensors, and catalysis
Data Source
AI summary
A composite is provided which comprises planar molybdenum oxide microstructures and cobalt oxyhydroxide microstructures disposed on the planar molybdenum oxide microstructures. A method of forming the composite is also provided. The composite is used in the fabrication of an electrochemical sensor, which comprises the composite, an electrode, and a polymeric coating. The electrochemical sensor is used in a method of detecting the presence of glucose in an analyte. The method involves applying a voltage to the electrochemical sensor relative to a counter electrode and measuring a current response. The method in insensitive to common oxidative interfering analytes such as urea, lactate, and NaCl.