Graphene

Graphene is a single layer of graphite, the carbon-based material found in pencil leads. Graphite has been known for centuries, but it wasn't until 2003 that graphene was isolated by cutting layers of graphite with tape. It is a layer of carbon atoms one atom thick arranged in a flat hexagonal lattice structure. 

It is originally seen on electron microscopes in 1962, but only examined while in use on metal surfaces. The material was later rediscovered, isolated, and examined in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester, who received the Nobel Prize in Physics in 2010 for their "pioneering experiments on the two-dimensional material graphene." The high-quality graphic turned out to be surprisingly easy to isolate.

Properties: 

Graphene is an allotrope of carbon made up of a single layer of atoms arranged in a two-dimensional honeycomb nanostructure. The name is derived from "graphite" and the suffix En, which reflects the fact that allotropic graphite of carbon contains numerous double bonds. Each atom in a graphene sheet is linked to its three closest neighbors by a σ bond and contributes an electron to a conduction band that runs the length of the sheet. 

Graphene's reputation as a "wonderful material" is based on its excellent properties. Its strong carbon-carbon bonds make it a million times thinner than a sheet of paper, but stronger than diamond and 200 times stronger than steel. It is also a flexible material and conducts heat and electricity better than copper. Since it is only one atom thick, almost 98% of visible light passes through graphene, making it transparent.

Production: 

Graphene is an extremely diverse material and can be combined with other elements (including gases and metals) to produce various materials with various superior properties. Researchers around the world are constantly studying and patenting graphene for its various properties and uses.

The only method of making large-area graphene was a very expensive and complex process (chemical vapor deposition, CVD) that used toxic chemicals to grow graphene as a monolayer by exposing platinum, nickel, or titanium carbide to ethylene or benzene at high temperatures.

 

There were no alternatives to using crystalline epitaxy on anything other than a metallic substrate. These production problems initially made graphene unavailable for development research and commercial purposes. Furthermore, the use of CVD graphene in electronics has been hampered by the difficulty of removing the graphene layers from the metal substrate without damaging the graphene.

Applications: 

Graphene has been a hot topic in materials and chemical research since its discovery in 2003. It has been associated with biomedical, electronic, and water purification applications. But how close are we really to using graphics in our daily lives? Here are some applications of the wonder material.

Display: 

Thanks to its transparency and conductivity, graphene can be used in screens and touch screens. However, these are currently more expensive to produce than the currently used material, indium tin oxide. 

James Tour, a professor of chemistry at Rice University who worked on ways to make graphene by dissolving pieces of graphite. The team has already created a flexible touch screen using polymer-supported graphene to create the screen's transparent electrodes. The indium tin oxide material currently used to make transparent electronic components is expensive and brittle. Making graphene into flexural polyester sheets is the first step in making transparent electronics stronger, cheaper, and more flexible. "In theory, you could roll up your iPhone and stick it behind your ear like a pencil," says Tour.

Water filters:

The graphene filter lets water through, but not other liquids and gases, so it can be used for water purification. Researchers are working on a device that could filter salt from seawater. 

In this latest research, Yang, Yang, and their colleagues devised a method to create centimeter-sized layers of porous graphene that do not suffer from the effects of defects. To do this, a mesh-like network of single-walled carbon nanotubes was applied to a graphene sheet, which essentially strengthens the material and blocks the propagation of cracks and tears. The pores are then etched into the material to create a desalination membrane. 

 

In the test, the equipment's membranes were able to remove 8597% of the salt from seawater. While this is impressive for membranes of this size, it should be increased to over 99% for use in commercial desalination systems. Scaling the membrane to meter sizes shouldn't be a problem, the team says.

Electronics:

Graphene was touted as the successor to silicon and was used to make very fast transistors. However, its conductivity cannot be "switched off" like silicon. Other 2D materials look more promising.

Researchers at the University of Manchester have already created the world's smallest graphene transistor. The smaller the transistors, the better they work in circuits. The fundamental challenge of the electronics industry in the next 20 years is the further miniaturization of technology.

Medical:

Several biomedical applications are being explored for graphene, including drug delivery, cancer therapy, and uses as a sensor. However, the toxicity profile must be assessed before each clinical application. 

Recent research has shown that graphene has multiple uses in the medical field, as researchers have discovered that graphene can be used to enhance cancer-fighting treatments. The main objective of the treatment of this type of disease is to destroy the diseased cells and affect the healthy cells as little as possible.

Several studies have found that combining charts with different medications and treatments can improve results. The load of the drug that reaches the cancer cells increases, increasing the chances of successful treatment. However, the use of this material is not limited to this, it is also estimated that there is a high probability that graphene-based muscle and bone implants will be produced. It has numerous properties that make it very useful for medical applications.

Energy storage:

Graphics-based energy storage is possible. It can also replace graphite in normal batteries and improve efficiency. Also, materials can be added to make them stronger and lighter.

The high conductivity of interconnected graphic networks also increases their interest in energy storage applications. Other factors such as its porous microstructure, its electrochemical stability, and its good mechanical stability are some of the advantages of graphene when used as an energy store. Some of these devices include their application in fuel cells, solar cells, batteries, and supercapacitors.

Reference:

1) https://en.wikipedia.org/wiki/Graphene

2) https://www.atriainnovation.com/en/graphene-characteristics-and-applications/

3) https://iopscience.iop.org/article/10.1149/2162-8777/abbb6f

4) https://www.graphene.manchester.ac.uk/learn/applications/electronics/

5) https://nanografi.com/blog/applications-of-graphene-in-medicine/

6) https://www.thegraphenecouncil.org/page/EnergyStorage15JUL