Graphene Printing via Localized Heating
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Solution Overview
Problem
The existing methods for growing graphene on substrates via chemical vapor deposition require additional processing steps such as photoresist application, exposure, and etching or cutting, which are time-consuming and costly for defining patterns or shapes.
Innovation Solution
A method utilizing a localized heating source, such as a laser or resistance device, to control the growth of graphene on a substrate by heating specific areas where a graphene precursor gas is applied, eliminating the need for etching or cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional CVD process with photoresist and etching is used to define graphene patterns, then manufacturing precision is achieved, but productivity decreases due to multiple time-consuming processing steps
Solution Approach 1:
The patent extracts and eliminates the photoresist application, exposure, and etching steps from the traditional CVD process. By using a maskless direct-write CVD approach with localized heating, only the essential graphene deposition step remains, dramatically reducing process time while maintaining pattern definition capability through direct thermal control.
Solution Approach 2:
The patent replaces the mechanical/chemical etching system with a thermal field-based direct-write system. Instead of using photoresist chemistry and physical etching tools, a localized heat source directly controls carbon precursor decomposition and graphene growth at specific locations, substituting complex mechanical-chemical processes with a simpler thermal field approach.
2Manufacturing precision
If traditional CVD process with multiple processing steps is used, then graphene pattern definition is achieved, but device complexity increases due to numerous processing steps
Solution Approach 1:
The patent merges the pattern definition function and graphene deposition function into a single integrated process step. The localized heating source simultaneously defines the pattern geometry and provides the thermal energy for graphene growth, combining what were previously separate functions (photolithography patterning + CVD deposition) into one unified direct-write process.
Solution Approach 2:
The patent removes the entire photoresist processing subsystem (application, exposure, development, etching) from the manufacturing flow. This extraction eliminates multiple complex processing steps while the localized heating approach provides pattern definition through direct thermal control during deposition, simplifying the overall device and process architecture.
3Productivity
If localized heating with laser is used for graphene printing, then productivity increases by eliminating etching steps, but use of energy increases due to localized heating requirements
Solution Approach 1:
The patent applies local quality by concentrating heating energy only at the specific locations where graphene deposition is required, rather than heating the entire substrate uniformly. The localized heat source creates a thermal gradient that enables selective graphene growth at targeted positions while leaving surrounding areas unaffected, achieving pattern definition through spatially differentiated thermal treatment.
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
This approach enables cost-effective and time-efficient graphene printing by directly defining patterns or shapes on substrates without additional processing steps, reducing time and costs associated with etching or cutting.
Implementation Method 1
a localized heating source, such as a laser for example, to locally heat a portion of a substrate while a graphene precursor gas flows over the portion of the substrate
Implementation Method 2
Graphene can be grown onto a substrate via a chemical vapor deposition (CVD) process
Data Source
AI summary
Graphene printing is disclosed. A disclosed example graphene printing apparatus includes a gas source to cause a graphene precursor gas to flow across a surface of a substrate, and a localized heat source to locally heat portions of the surface to cause graphene to grow at the portions of the surface based on a printing pattern.