Electrically Controlled Thermal Radiation from Reduced Graphene Oxide Membranes.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Reduced graphene oxide (rGO) exhibits unique electronic and optical properties.
• Controlling thermal radiation is crucial for photonic applications.
• Ionic intercalation offers a potential mechanism for modulating material properties.

Purpose of the Study:

• To fabricate hybrid devices combining rGO films and porous polymer membranes with ionic solutions.
• To investigate the electrical control of thermal radiation from rGO surfaces.
• To understand the underlying physical mechanisms of intercalation-induced optical property changes.

Main Methods:

• Fabrication of hybrid devices with rGO films on porous polymer membranes.
• Electrically driven reversible ionic intercalation into rGO films.
• Comparative analysis of structural, chemical, and optical properties.
• Infrared thermal imaging to assess device performance.

Main Results:

• Successful fabrication of hybrid devices enabling electrical control of thermal radiation.
• Demonstration of reversible ionic intercalation to modulate light emission from rGO.
• Identification of Pauli blocking as the primary mechanism for reduced light emission.
• Observation of bias-induced apparent temperature reduction of hot surfaces.

Conclusions:

• Hybrid rGO/polymer devices provide a platform for electrical control of thermal radiation.
• Ionic intercalation, via Pauli blocking, effectively tunes optical properties.
• The developed devices show promise for electrical control of mid-infrared photonics.