Graphene-Coated Resonator Tines for Reduced MEMS Noise

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Solution Overview

Problem

Existing micro-electromechanical devices, such as vibrating beam accelerometers, suffer from noise floors due to plastic deformations in metallized conductive regions on resonator tines, which degrade precision and accuracy due to mechanical deformations in materials like gold and chromium, especially at interfaces, impacting navigation systems.

Innovation Solution

Replace the conventional conductive patterns on resonator tines with a graphene layer, which is both conductive and elastic, reducing noise floor by accommodating strains without substantial disruptions at the pattern-substrate interface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metallized conductive regions (gold and chromium) are used on resonator tines, then electrical conductivity is achieved, but plastic deformations occur causing noise floor and reducing precision

Engineering Contradiction:

ImproveprecisionVSAvoidnoise floor

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the material parameter from conventional metallized conductive regions (gold and chromium) to graphene, which has different mechanical and electrical properties. Graphene's superior elasticity and lack of plastic deformation capability resolve the contradiction by maintaining conductivity while eliminating the source of noise floor and precision degradation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs graphene as a composite material solution that combines electrical conductivity with mechanical elasticity. This composite approach replaces the multi-layer metallization (chromium-gold) with a single-layer graphene structure that inherently prevents plastic deformation, thereby reducing noise floor while maintaining reliable electrical connection.

Inventive Principle:

Principle #40Composite materials

2Measurement precision

If conventional conductive patterns are used, then electrical connection is established, but mechanical deformations at interfaces degrade measurement accuracy

Engineering Contradiction:

Improveacceleration detection accuracyVSAvoidinterface stability

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent changes the material composition parameter from metallized layers to graphene, which fundamentally alters the interface stability characteristics. Graphene's atomic structure and bonding properties eliminate the plastic deformation issues that occur at chromium-gold interfaces, thereby stabilizing the pattern-substrate interface and improving acceleration detection accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

While not directly applicable to the graphene layer itself, this principle relates to the elimination of complex multi-layer metallization structures. The patent simplifies the conductive pattern from a multi-layer disposable metallization system to a single-layer graphene structure that is inherently more stable and durable, reducing interface-related measurement errors.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If rigid conductive materials are used, then electrical conductivity is maintained, but flexibility and conformance during resonation are reduced

Engineering Contradiction:

Improveconductive trace durabilityVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the material parameter from rigid metallized conductive regions to graphene, which possesses unique mechanical properties including high flexibility and elasticity. This parameter change enables the conductive trace to conform to the resonator tine during resonation while maintaining electrical conductivity and durability, resolving the contradiction between rigidity and flexibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs graphene as a thin film structure that inherently provides flexibility and conformability. The single-atom thickness and two-dimensional structure of graphene allow it to flex and conform to the resonator tine surface during vibration, unlike rigid metallized layers, thereby maintaining both durability and adaptability.

Inventive Principle:

Principle #30Flexible shells and thin films

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 use of graphene layers on resonator tines in micro-electromechanical devices reduces noise floor, enhancing precision and accuracy by mitigating mechanical deformations, thereby improving navigation capabilities.

Implementation Method 1

The graphene layer may be used instead of a conductive trace including gold and/or chromium, and may exhibit a higher flexibility and conformance with the resonator tine during resonation

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

A graphene layer may be deposited over at least a portion of the first resonator tine

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Data Source

PatentUS20250304427A1Micro-electromechanical devices

Publication Date: 2025.10.02 HONEYWELL INTERNATIONAL INC

AI summary

A micro-electromechanical device may include a first resonator tine and a second resonator tine configured to resonate in-plane and out-of-phase with each other. A graphene layer may be deposited over at least a portion of the first resonator tine.