Graphene Displacement Sensing by Parallel Capacitive Flake Sliding
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Solution Overview
Problem
Existing methods for measuring graphene displacement are inaccurate due to the instability of multilayered graphene when mounted perpendicularly to a substrate, and require large, complex devices that do not leverage the small size of graphene.
Innovation Solution
A displacement detecting device with an insulating substrate and stacked graphene sheets, where electrodes are mounted parallel to the basal plane, allowing accurate measurement of graphene displacement through capacitance variation using a capacitor formed by the electrode and graphene flake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the knife edge method is used to measure graphene displacement, then displacement measurement is possible, but the device size becomes excessively large
Solution Approach 1:
The patent replaces the optical knife-edge measurement system with an electrical capacitance-based measurement system. The displacement detection is achieved by measuring capacitance changes between the movable electrode (graphene) and fixed electrode, eliminating the need for laser beams, detectors, and lenses, thus drastically reducing device size while maintaining measurement capability
Solution Approach 2:
The patent changes the measurement parameter from optical properties (light power) to electrical properties (capacitance). By measuring capacitance variation as the graphene flake moves, the system achieves displacement measurement with a compact electrical structure instead of a bulky optical setup
2Measurement precision
If multilayered graphene is mounted perpendicularly to the substrate, then displacement measurement can be performed, but the graphene becomes unstable
Solution Approach 1:
Instead of mounting the graphene flake perpendicularly to the substrate as in conventional methods, the patent inverts the arrangement by mounting the graphene flake parallel to the substrate surface. This allows the basal plane to remain parallel to the substrate, maintaining stability while still enabling displacement measurement through capacitance changes
Solution Approach 2:
The patent changes the mounting orientation from vertical (perpendicular to substrate) to horizontal (parallel to substrate). This dimensional change in mounting approach resolves the instability issue while preserving the ability to measure displacement in the direction parallel to the basal plane
3Measurement precision
If electrodes are mounted perpendicularly to the substrate, then capacitance variation can be measured, but graphene mounting becomes difficult and unstable
Solution Approach 1:
The patent inverts the electrode mounting orientation from perpendicular to parallel relative to the substrate. This allows graphene to be mounted in a stable configuration with its basal plane parallel to the substrate, while electrodes are positioned on the substrate surface to create capacitance variation as graphene moves
Solution Approach 2:
The patent applies different orientations to different components: the graphene flake is mounted with its basal plane parallel to the substrate for stability, while the electrodes are positioned on the substrate surface at specific locations to detect capacitance changes. This localized differentiation of orientations optimizes both stability and measurement capability
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
Enables accurate and stable measurement of graphene displacement, suitable for integration into micro electro mechanical systems (MEMS) without the need for large devices, and allows high-frequency vibration of graphene flakes.
Implementation Method 1
The electrode is mounted so that capacitance of a capacitor constituted of the electrode and the graphene flake varies according to a movement amount of the graphene flake
Data Source
AI summary
A displacement detecting device includes: an insulating substrate; a graphene block in which graphene sheets each consisting of a single-layered graphene are stacked in layers; and an electrode of a conductor. The graphene block is fixed to a surface with a largest area among surfaces of the insulating substrate. The electrode is mounted on the above-mentioned surface of the insulating substrate. The above-mentioned surface of the insulating substrate is parallel to a basal plane of each of a plurality of the graphene sheets included in the graphene block. The graphene block includes a graphene flake that moves by sliding in a direction parallel to the basal plane in a case where a force having a component parallel to the basal plane is applied to the graphene block. The graphene flake is constituted of one or a plurality of the graphene sheets.