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High-Resolution Laser-Induced Graphene. Flexible Electronics beyond the Visible Limit. | LitMetric

High-Resolution Laser-Induced Graphene. Flexible Electronics beyond the Visible Limit.

ACS Appl Mater Interfaces

Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.

Published: March 2020

AI Article Synopsis

Article Abstract

Laser-induced graphene (LIG) is a multifunctional graphene foam that is commonly direct-written with an infrared laser into a carbon-based precursor material. Here, a visible 405 nm laser is used to directly convert polyimide into LIG. This enabled the formation of LIG with a spatial resolution of ∼12 μm and a thickness of <5 μm. The spatial resolution enabled by the relatively smaller focused spot size of the 405 nm laser represents a >60% reduction in LIG feature sizes reported in prior publications. This process occurs in an SEM chamber, thus allowing direct observation of LIG formation. The reduced size of the LIG features enables the direct-write formation of flexible electronics that are not visible to the unaided eye. A humidity sensor is demonstrated which could detect human breath with a response time of 250 ms. With the growing interest in LIG for flexible electronics and sensors, finer features can greatly expand its utility.

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Source
http://dx.doi.org/10.1021/acsami.0c01377DOI Listing

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