Laser-Induced Graphene Composites for Robust Gas Sensor Substrates
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Solution Overview
Problem
Laser-induced graphene (LIG) faces challenges in terms of weak adherence to substrates, limited transferability to various materials, and the need for enhanced robustness and new applications.
Innovation Solution
The development of LIG composites through an infiltration method, which allows for the engineering of physical properties such as superhydrophobicity and antibiofouling, and the creation of flexible and embeddable gas sensors that detect thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LIG is produced directly on polymer substrate through laser irradiation, then the production process is simple and fast, but the adherence of LIG to substrate is weak
Solution Approach 1:
The patent applies composite materials principle by combining LIG with various host materials (polymers, metals, ceramics, composites) to create LIG-based composite materials. This resolves the adherence issue by integrating LIG into a composite structure where the interface between LIG and host material provides strong mechanical bonding, while maintaining the simple laser-based production process for creating the composite.
2Device complexity
If LIG is used as a standalone material, then the material structure is simple, but the transferability to various materials is limited
Solution Approach 1:
The patent implements universality by designing LIG-based composite materials that can be applied to diverse substrates including polymers, metals, ceramics, and composite materials. The LIG component maintains its core functionality while the composite structure enables transferability across different material types, allowing a single LIG-based solution to serve multiple application domains.
Solution Approach 2:
By creating composites of LIG with various host materials, the patent enables the LIG structure to be adapted to different substrate types and application requirements while maintaining the fundamental LIG architecture, thus achieving versatility without significantly increasing structural complexity.
3Device complexity
If LIG is used in standalone form, then the material composition is simple, but the robustness is insufficient
Solution Approach 1:
The patent enhances robustness by integrating LIG with host materials that provide mechanical strength, stability, and durability. The composite structure combines the unique properties of LIG with the reinforcing characteristics of host materials, resulting in a more robust material system while keeping the overall composition manageable through selective host material choice.
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 LIG composites exhibit improved stability and robustness, enabling applications in antibacterial, Joule-heating, and resistive memory device substrates, as well as the detection of a broad range of gases and gas mixtures.
Implementation Method 1
laser photothermal conversion has emerged as a roll-to-roll compatible method to generate laser-induced graphene (LIG) films
Implementation Method 2
LIG is used to create a gas sensor that detects the thermal conductivity of surrounding gaseous media
Implementation Method 3
Joule-heating applications
Data Source
AI summary
Methods for stabilizing laser-induced graphene (LIG) through composite formation and compositions thereof. Using infiltration methods and/or lamination methods, LIG composites (LIGCs) with physical properties can be engineered on various substrate materials. The physical properties include surface properties, such as superhydrophobicity and antibiofouling; the LIGCs are also useful in antibacterial applications, Joule-heating applications, and as resistive memory device substrates. Further, methods for fabricating and using LIG for flexible and embeddable gas sensors.