Related Experiment Video
Updated: Jan 27, 2026
07:51
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
3.8K
Flexible Mid-Infrared Radiation Modulator with Multilayer Graphene Thin Film by Ionic Liquid Gating
Yue Sun1, Yangyang Wang1, Ce Zhang1
1Nanophotonics and Optoelectronics Research Center, Qian Xuesen Laboratory of Space Technology , China Academy of Space Technology , Beijing 100094 , China.
ACS Applied Materials & Interfaces
|March 22, 2019
Summary
This study presents a flexible graphene device that tunes infrared radiation for energy saving and thermal camouflage. The device achieves an 80% emissivity reduction in 2 seconds via electrical control.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Growing demand for energy-saving technologies and thermal camouflage.
- Need for tunable infrared radiation devices.
Purpose of the Study:
- To design a mid-infrared radiation modulator using flexible multilayer graphene.
- To achieve tunable thermal emissivity for energy saving and camouflage.
Main Methods:
- Fabrication of flexible multilayer graphene thin films on various substrates.
- Gating the graphene films with nonvolatile ionic liquid.
- Electrical control of ion accumulation in graphene.
Main Results:
- Achieved nearly 80% decrease in thermal emissivity within 2 seconds.
- Demonstrated tunable mid-infrared radiation for thermal camouflage.
- Explained emissivity reduction via Drude model and intraband absorption decrease.
Conclusions:
- The developed electrochromic device offers efficient and rapid control of infrared radiation.
- Potential applications include energy-efficient buildings, infrared sources, and advanced thermal camouflage.
- Flexible, double-sided radiation control structures expand application possibilities.
Related Concept Videos
03:10Ionic Radii
33.5K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.5K
00:42Ionic Bonds
130.1K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
130.1K
02:54Molecular and Ionic Solids
20.0K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.0K
02:55Solubility of Ionic Compounds
68.1K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.1K
02:42Ionic Crystal Structures
17.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.0K
03:34Ionic Compounds: Formulas and Nomenclature
86.7K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
86.7K