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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

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Published on: September 23, 2018

Dark materials based on graphene sheet stacks.

Alon Ludwig¹, Kevin J Webb

¹School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.

|January 26, 2011

Summary

This summary is machine-generated.

Graphene sheet stacks exhibit very low reflectivity and high absorbance, making them darker than carbon nanotube materials. These properties offer potential for advanced coatings and photodetectors.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Graphene's unique electronic and optical properties are of significant interest.
Carbon-based nanomaterials are explored for applications requiring specific light interaction.
Understanding the effective medium properties of nanostructured materials is crucial for device design.

Purpose of the Study:

To calculate the effective medium properties of graphene sheet stacks.
To compare the optical properties (reflectivity and absorbance) of graphene stacks with other nanomaterials.
To explore the potential applications of graphene stacks in coatings and photodetectors.

Main Methods:

Effective medium approximation calculations were performed for graphene sheet stacks.
Optical properties, specifically reflectivity and absorbance, were theoretically determined.
The study discusses the limitations of the effective medium approximation.

Main Results:

Graphene sheet stacks demonstrate very low reflectivity and high absorbance.
These materials are shown to be darker than recently studied carbon nanotube materials.
The effective medium approximation provides a framework for understanding these properties.

Conclusions:

Graphene sheet stacks show promise for developing low-reflectivity coatings.
Enhanced photodetectors can potentially be realized using graphene stacks.
Further investigation into regimes beyond the effective medium approximation may reveal additional benefits.