Graphene MEMS Sample Support for Low-Interference Electron Microscopy

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Solution Overview

Problem

Conventional sample supports in charged particle microscopy, such as transmission electron microscopy, suffer from interference with the electron beam due to their thickness and material properties, leading to reduced signal quality and experimental failures, especially when integrated with MEMS heaters and gas chambers.

Innovation Solution

A charged particle microscopy sample support device with an integrated heater and biasing electrodes, featuring a thin graphene layer to minimize background signal interference, high thermal and electrical conductivity, and precise control over the sample environment, manufactured using a method that ensures the graphene layer's integrity and uniformity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional amorphous carbon-based supports are used, then the sample support provides structural stability, but the thickness and material properties cause significant background signal interference

Engineering Contradiction:

Improvebackground signal interferenceVSAvoidstructural stability

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent replaces conventional thick amorphous carbon supports (typically 20 nm) with an ultrathin continuous graphene layer. Graphene's two-dimensional structure provides mechanical support while being essentially transparent to the electron beam, dramatically reducing background signal interference while maintaining structural stability.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The invention combines graphene with silicon nitride membranes to create a composite support structure. The silicon nitride provides mechanical strength and stability, while the ultrathin graphene layer provides electron beam transparency and minimal background signal, achieving both structural stability and reduced interference.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If the sample support is made thinner to reduce interference, then background signal decreases, but manufacturing reproducibility deteriorates

Engineering Contradiction:

Improvebackground signal interferenceVSAvoidmanufacturing reproducibility

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent changes the material parameter from amorphous carbon to crystalline graphene, which enables atomic-layer precision in thickness control. This parameter change allows for reproducible manufacturing of ultrathin supports with consistent single-layer thickness, overcoming the reproducibility issues of conventional materials.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces mechanical support structures with a two-dimensional graphene membrane that derives its strength from its atomic structure rather than thickness. This substitution allows ultrathin dimensions to be achieved while maintaining structural integrity through graphene's inherent mechanical properties.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If conventional sample supports are used, then manufacturing is simple, but experimental failures increase due to poor reproducibility

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidexperimental success rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs self-assembled graphene layers that form continuous, uniform membranes through controlled growth processes. This self-assembly mechanism automatically ensures high quality and consistency without requiring complex manual intervention, achieving both ease of manufacture and high reliability.

Inventive Principle:

Principle #25Self-service

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 graphene layer reduces background signal interference, enhances signal quality, and allows for precise control over the sample environment, improving the study of sensitive specimens by combining the structural stability of silicon nitride membranes with the properties of graphene, thereby reducing artefacts and maintaining high-quality imaging.

Implementation Method 1

The graphene layer reduces background signal interference, enhances signal quality

Methodology Applied

Scientific EffectElectron beam scattering: Scattering

Implementation Method 2

A charged particle microscopy sample support device with an integrated heater

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

combining the structural stability of silicon nitride membranes with the properties of graphene

Methodology Applied

Scientific EffectMechanical strength:

Data Source

PatentUS20240038483A1Charged particle microscopy MEMS sample support

Publication Date: 2024.02.01 UNIVERSITEIT ANTWERPEN

AI summary

The present disclosure relates to a sample support device for charged particle microscopy and related methods. The device comprises a substrate and a heating and/or biasing element integrated in or on the substrate to heat (or apply a bias voltage to) a sample when positioned in an observation region of the device. The device comprises a membrane covering an opening in the heater element and/or substrate in the observation region of the device. The membrane is perforated to form at least one hole covered by a graphene layer to form a sample support to place a sample of interest thereon for study. A cap covers the membrane such that a chamber is formed in which the sample can be isolated in a controllable gaseous environment.