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Reversible Ionic Liquid Intercalation for Electrically Controlled Thermal Radiation from Graphene Devices.

Xiaoxiao Yu^1,2, Gokhan Bakan^1,2, Hengyi Guo¹

¹Department of Materials, The University of Manchester, M13 9PL Manchester, United Kingdom.

|June 15, 2023

Summary

Ionic liquid intercalation impacts long-term performance of graphene infrared devices. Key limitations include ion-size asymmetry and oxygen effects, crucial for thermal management applications.

Keywords:

electro-optical effect graphene infrared device intercalation ionic liquid thermal radiation

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Graphene's tunable optical properties enable advanced devices like tunable infrared emissivity surfaces.
Controlling graphene's charge density via electrostatic gating or intercalation is key for device functionality.
Ionic liquid intercalation is a promising method for tuning graphene's optical characteristics.

Purpose of the Study:

To investigate the long-term performance of optoelectronic devices utilizing ionic liquid intercalation in graphene.
To identify the primary factors limiting the performance and stability of these infrared devices.
To provide insights into the mechanisms governing graphene applications in infrared thermal management.

Main Methods:

Spectroscopic characterization to analyze optical properties and material changes.
Thermal characterization to assess heat management capabilities.
Ionic liquid intercalation as the primary method for tuning graphene's charge density.

Main Results:

Identified electrolyte ion-size asymmetry as a significant limiting factor for intercalation efficiency.
Revealed charge distribution schemes within the graphene structure affect device performance.
Observed detrimental effects of oxygen on the long-term stability and performance of the infrared devices.

Conclusions:

Ionic liquid intercalation performance in graphene-based infrared devices is limited by ion-size asymmetry and oxygen presence.
Understanding these limitations is crucial for developing stable and efficient graphene applications in infrared thermal management.
The study offers insights into optimizing graphene for tunable heat signature control and advanced optical devices.