Nano-composite Gas Sensor Peptide-CNT Membrane Dispersion
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Solution Overview
Problem
Existing gas sensors face challenges in dispersing peptides with nano-conductive materials, limited compatibility with solvents, and inadequate mechanical properties of carbon black, leading to sensitivity and repeatability issues.
Innovation Solution
A method for making a nano-composite gas sensor involving a substrate with electrodes, a nano-conductive film made from carbon nanotubes or graphene, and a peptide film, where carbon nanotubes are dispersed in solvents like MEK or H2O, and peptides in solvents like Toluene or H2O, forming a double-layered gas-sensing membrane with improved dispersion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is used as nano-conductive material, then the sensor can be manufactured, but the mechanical properties and deformability are inadequate
Solution Approach 1:
The patent changes the dimensional parameter of the conductive material from zero-dimensional (carbon black) to one-dimensional (carbon nanotubes). This parameter change fundamentally improves mechanical properties while maintaining electrical conductivity, thereby resolving the contradiction between manufacturability and mechanical reliability.
Solution Approach 2:
The patent creates a composite structure by combining peptide molecules with carbon nanotubes. The peptide provides structural integrity and selectivity, while the carbon nanotubes provide conductivity and mechanical strength. This composite approach resolves the contradiction by synergistically combining materials with complementary properties.
2Measurement precision
If multiple peptides are mixed with nano-conductive material, then the sensor sensitivity is improved, but the dispersion and compatibility with solvent become difficult
Solution Approach 1:
The patent uses peptide molecules as intermediaries that bridge the nano-conductive material (carbon nanotubes) and the sensing environment. The peptides are dispersed in compatible solvents (water or alcohol) and then combined with carbon nanotubes, creating a stable composite solution that maintains both sensitivity and ease of manufacture.
Solution Approach 2:
The patent achieves homogeneous dispersion by carefully selecting solvents that are compatible with both the peptide molecules and carbon nanotubes. The peptides and carbon nanotubes form a uniform composite structure in the solvent, eliminating aggregation issues and maintaining both sensitivity and manufacturability.
3Strength
If carbon nanotubes are used instead of carbon black, then the mechanical properties are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs a straightforward coating process where carbon nanotube-peptide composite solutions are applied to the sensor substrate and then dried. This simple, disposable-like approach to manufacturing avoids complex fabrication steps while achieving the desired mechanical properties, thereby reducing manufacturing complexity despite using advanced materials.
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 method enhances sensitivity, detection limit, and repeatability of gas sensors, simplifies the manufacturing process, and reduces sensing time by using a double-layered membrane of nano-conductive and peptide films on a substrate, improving controllability and mechanical properties.
Implementation Method 1
carbon nanotubes are dispersed in solvents like MEK or H2O
Implementation Method 2
the nano-conductive film may be made of carbon nanotubes, carbon black, carbon balls and graphene
Implementation Method 3
peptides in solvents like Toluene or H2O, forming a double-layered gas-sensing membrane
Implementation Method 4
the resistances of the sensors change as the polymer coated on the electrodes expands to different extents as it absorbs the gas
Implementation Method 5
forming a double-layered gas-sensing membrane with improved dispersion and mechanical properties
Data Source
AI summary
There is disclosed a method for making a nano-composite gas sensor. At first, there is provided a substrate. Then, electrodes are provided on the substrate in an array. Finally, a gas-sensing membrane is provided on the electrodes. The gas-sensing membrane includes a nano-conductive film and a peptide film.