Pressure-Sensitive Transistor Using Deep Eutectic Solvent Gel
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Solution Overview
Problem
Replicating the sense of touch in machines has proven elusive due to the difficulty in creating artificial skin with tactile receptors that can accurately sense pressure.
Innovation Solution
A transistor with a variable gate-electrode capacitance is developed, utilizing a gel electrolyte that changes capacitance in response to pressure, allowing for sensitive pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transistor with gel electrolyte gate is used, then pressure measurement sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent utilizes changes in the physical state and properties of the gel electrolyte in response to pressure. The gel's capacitance, ionic conductivity, and contact area with the gate electrode vary as pressure applied to the pressure-sensitive region changes, enabling pressure measurement through electrical parameter detection.
Solution Approach 2:
The gel electrolyte serves as an intermediary medium between the pressure-sensitive region and the gate electrode. It transduces mechanical pressure into electrical signal changes by deforming its structure and altering its electrical properties, thereby mediating the pressure measurement function.
2Reliability
If deep eutectic solvent gel is used, then reliability is improved due to low volatility, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs deep eutectic solvents that undergo phase changes or property changes in response to pressure. The unique molecular structure and strong hydrogen bonding in deep eutectic solvents create a gel state with stable electrical properties that change predictably with pressure, improving reliability while maintaining manufacturability.
Solution Approach 2:
The patent uses composite material systems combining deep eutectic solvents with appropriate additives and substrates. This composite approach leverages the low volatility and stable electrical properties of deep eutectic solvents while using complementary materials to facilitate manufacturing and enhance device performance.
3Measurement precision
If gel contact area with gate electrode is increased, then capacitance variation with pressure is improved, but device size increases
Solution Approach 1:
The patent applies local quality by concentrating the pressure-sensitive gel material specifically at the pressure-sensitive region where it contacts the gate electrode. This localized placement ensures that pressure changes in this specific area produce the desired capacitance variation, while the rest of the device maintains minimal size.
Solution Approach 2:
The patent utilizes the third dimension (depth/thickness) by creating a pressure-sensitive region that extends vertically beneath the gate electrode. This vertical arrangement allows the gel to contact the gate electrode over a meaningful area without increasing the lateral footprint of the device, effectively using depth to achieve the required contact area.
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 transistor effectively measures pressure with high sensitivity, enabling the creation of artificial skin with tactile capabilities, expanding the dynamic range of pressure measurement when interconnected.
Implementation Method 1
The resulting change in contact area causes a variation in capacitance of the interface between the gel and the gate electrode
Implementation Method 2
pressure on the gate deforms the gel
Implementation Method 3
a gel that comprises a eutectic mixture having ionic conductivity
Data Source
AI summary
A transistor that has a capacitance that varies in response to pressure includes a gel coupled to a gate thereof. The gel comprises a eutectic mixture having ionic conductivity.