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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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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Triazine-based graphitic carbon nitride: a two-dimensional semiconductor.

Gerardo Algara-Siller¹, Nikolai Severin, Samantha Y Chong

¹Universität Ulm, Materialwissenschaftliche Elektronenmikroskopie, Albert-Einstein-Allee 11, 89081 Ulm (Germany).

Angewandte Chemie (International Ed. in English)

|May 20, 2014

Summary

This summary is machine-generated.

Researchers synthesized large crystalline thin films of graphitic carbon nitride (GCN) for the first time. These 2D materials possess a tunable direct bandgap, making them promising for electronic applications.

Keywords:

carbon nitride graphene semiconductor thin films

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Published on: July 24, 2015

Area of Science:

Materials Science
Solid-State Physics
Nanotechnology

Background:

Graphitic carbon nitride (GCN) is structurally similar to graphite but possesses a bandgap.
Previous research predicted GCN's potential for electronic applications.

Purpose of the Study:

To synthesize macroscopically large crystalline thin films of triazine-based graphitic carbon nitride (TGCN).
To characterize the structural, optical, and electronic properties of the synthesized TGCN films.

Main Methods:

Ionothermal, interfacial reaction using dicyandiamide as a monomer.
Scanning force microscopy (SFM) and transmission electron microscopy (TEM) for structural analysis.
Optical spectroscopy, X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) for electronic property characterization.

Main Results:

Successfully grew macroscopically large crystalline thin films of TGCN.
Films consist of stacked 2D crystals with thicknesses ranging from a few to hundreds of atomic layers.
Confirmed long-range in-plane order and a direct bandgap of 1.6–2.0 eV.

Conclusions:

TGCN can be synthesized in large crystalline thin film form.
The direct bandgap of TGCN makes it suitable for electronic devices.
TGCN is a promising material for field-effect transistors and light-emitting diodes.