Capacitive Gas Sensor Nano-Carbon Electrode Resin Reinforcement
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Solution Overview
Problem
The capacitive gas sensor with a nano-carbon material-based second electrode layer, entangled three-dimensionally, experiences separation from the gas-sensitive film due to reduced bonding strength, leading to increased electrical resistance and degradation in humidity response and hysteresis, especially at high AC signal frequencies and high humidity.
Innovation Solution
A reinforcing resin layer with air permeability, made of the same material as the gas-sensitive film, is introduced to cover the second electrode layer, infiltrating its voids and directly contacting the gas-sensitive film, preventing separation and maintaining detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the second electrode layer is formed from a nano-carbon material entangled to be three-dimensionally reticulated, then gas permeability is improved, but bonding strength with the gas-sensitive film is reduced
Solution Approach 1:
A resin layer is introduced as an intermediary between the second electrode layer and the gas-sensitive film. This resin layer penetrates into the voids of the three-dimensionally reticulated nano-carbon material, forming anchoring structures that mechanically interlock with the electrode layer while providing sufficient bonding strength to the gas-sensitive film, thereby resolving the contradiction between gas permeability and bonding strength
Solution Approach 2:
The sensor structure employs a composite material system consisting of the nano-carbon material-based second electrode layer, the resin layer, and the gas-sensitive film. The resin layer acts as a bonding composite that combines the gas permeability benefits of the nano-carbon structure with the adhesive properties needed for strong bonding to the gas-sensitive film
2Quantity of substance
If the second electrode layer and gas-sensitive film are separated, then electrical resistance increases, but the nano-carbon material structure provides good gas permeability
Solution Approach 1:
The resin layer serves as a mediator that prevents separation between the second electrode layer and the gas-sensitive film. By penetrating the voids of the nano-carbon material and bonding to both layers, it ensures continuous electrical contact while preserving the gas permeability of the three-dimensionally reticulated structure
Solution Approach 2:
The resin layer is applied in advance to the second electrode layer before final assembly, where it penetrates and anchors into the nano-carbon structure. This beforehand cushioning prevents separation under subsequent operational conditions such as humidity changes or thermal stress, thereby maintaining stable electrical resistance
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 reinforcing resin layer effectively prevents separation of the second electrode layer from the gas-sensitive film, ensuring reliable capacitance response to humidity changes and reducing hysteresis, even at high AC signal frequencies and high humidity, thus maintaining sensor detection accuracy.
Implementation Method 1
The reinforcing resin layer gets into voids inside the second electrode layer
Data Source
AI summary
A capacitive gas sensor in which a second electrode layer made of a nano-carbon material entangled to be three-dimensionally reticulated and a gas-sensitive film are not separated from each other. A capacitive gas sensor includes a substrate; a first electrode layer formed on the substrate; a gas-sensitive film formed on the first electrode layer and having air permeability; and a second electrode layer formed on the gas-sensitive film to be opposed to the first electrode layer and made of a nano-carbon material entangled to be three-dimensionally reticulated. The capacitive gas sensor also includes a reinforcing resin layer having air permeability and disposed at least on the second electrode layer.