Introduction of Graphene
Graphene is the basic unit of Graphite that is one of the compositions used in pencil tips. It is a one-atom-thick layer of carbon atoms arranged in a hexagonal lattice. The incredible properties of graphene have made it famous and it has got the name of wonder material. Layers of graphene stacked on top of each, other form graphite, with an interplanar spacing of 0.335 nanometers.
Graphene, the thinnest material at one atom thick is about 200 times stronger than steel and thus it is known for its marvelous strength. Being a very good conductor of heat and electricity, graphene has interesting light absorption abilities. Graphene is such a material that it can be combined with other elements (including gases and metals) to produce multiple different materials that features top-class properties. The various properties and possible applications are as follows:
- Computer chips
- Touchscreens (for LCD or OLED displays)
- DNA sequencing
- Salt water filters
Types of Graphene
Liquid Phase and Thermal Exfoliation:
These types of Graphene involve breaking up graphite to form graphene flakes. The splitting can be done either by using thermal shock or chemical solvents. The flakes produced are mostly multilayered and the number of layers can be difficult to handle. This process can also introduce impurities into the graphene.
If carbon nanotubes are used in place of graphite, it is possible to obtain smaller platelets of graphene. But the limitation is that it makes the process much more costly and time-consuming.Synthesis on Silicon Carbide:
To synthesize graphene layers, silicon carbide can be used. When Silicon atoms are sublimated, the left out portion of the silicon carbide becomes a thin graphite surface. These days it has become easy to control the number of graphene layers and to get a supreme quality over a large area.
The main shortcomings of this process are the high cost of silicon carbide and the requirement for elevated temperatures to achieve the sublimation. These factors will perhaps limit graphene made by this method to niche markets, such as metrology resistance standards and high-frequency transistors.Chemical Vapor Deposition (CVD):
As per todays theory, the Chemical Vapor Deposition is considered as the best methods for fabricating high quality graphene in huge quantities. The steps in this method include depositing gaseous carbon atoms on a copper foil, then transferring the graphene film to a wide range of substrates, such as silicon.
To minimize the amount of defects, the CVD process can be controlled. The favorable price/quality ratio makes CVD graphene suitable for many applications such as flexible/transparent electronics, gas barriers, and anti-corrosion coating.
Properties Of Graphene
The colorful properties of graphene make it an appealing recommendation to produce for use in various sorts of gadget. The limitation is that not all of these devices would exploit the amazing properties of graphene to their full potential.
Few of the properties of graphene are listed below:
- Electron mobility – Graphenes high electron mobility translates into higher conductivity. This feature may have applications in chemical and biochemical sensing devices. Graphene has an electron mobility of up to 200,000 cm2/Vs. The electron mobility property of Graphene is apt for ultra fast switching.
- Youngs Modulus – This property of Graphene is estimated by measuring the strain applied by a pressure across graphene membranes by using Raman spectroscopy. This strain that is induced on pressurized graphene balloons can be estimated directly from the peak shift of the Raman G band. We get the Youngâ&euro&trades modulus of graphene by comparing the measured strain with numerical simulation. The estimated Youngâ&euro&trades modulus values of single- and bilayer graphene are 2.4 Â± 0.4 and 2.0 Â± 0.5 TPa, respectively.
Graphene is impenetrable to all gases and is capable of sustaining high densities of electric current.
Applications of Graphene
Graphene finds its usage in various fields:
- Photonics – Graphene features high mobility and optical transparency. Additionally it also features flexibility, robustness and environmental stability. The photonics property of graphene ranges from solar cells and light- emitting devices to touch screens, ultrafast lasers and photodetectors.
- Batteries – Traditional battery electrode materials gets better when enhanced with graphene. Graphene can make batteries that are light, durable and suitable for high capacity energy storage. The lifetime of a battery is extended since graphene adds conductivity without requiring the amounts of carbon that are used in traditional batteries.
- Flexible and transparent electronics – Graphene and related 2D materials is utilized to create light emitting devices for the next generation of tablets, mobile phones and televisions. This usage will make them astonishingly thin, durable, flexible and even semi-transparent.
- Biotechnology – Graphene exhibits superb aqueous processability, amphiphilicity, surface functionality and fluorescence quenching ability which are considered excellent for biological applications. Additionally, the hydrophobicity and flexibility of large-area graphene synthesized by chemical vapor deposition (CVD) allow this material to play an important role in cell growth and differentiation.
Graphene is also being used to boost not only the capacity and charge rate of batteries but also the longevity. Many people have brought graphene-enhanced products to use at home. One such e.g is the conductive ink.This is made by effectively mixing tiny graphene flakes with ink, enabling you to print electrodes directly onto paper. Using organic semiconductive ink, this technique was previously possible but with advancement the use of graphene flakes makes the printed material majorly more conductive and therefore more efficient.
Graphene is highly inert and so can act as a corrosion barrier between oxygen and water diffusion. This could mean that future vehicles could be made to be corrosion resistant as graphene can be made to be grown onto any metal surface (given the right conditions). Due to its strength, graphene is also currently being developed as a potential replacement for Kevlar in protective clothing, and will eventually be seen in vehicle manufacture and possibly even used as a building material.
For most of these applications, CVD graphene is the perfect material in terms of quality and cost. In some special cases, unique fabrication techniques may be required. For e.g., molecular assembly of graphene is a useful process for creating customized components in nanoelectronics. Liquid phase exfoliation is suitable for fabricating graphene inks or paints for use in printed electronics.
Our Range of Graphene Products
Functionalized Single Layer Graphene in Aqueous Solution:
You will find extensive range of functionalized single layer graphene in aqueous solution under one roof that is mknano. We have Alkyne functionalized, Amine functionalized, Azide functionalized and many more. You ask for any type and you will get under our roof.Graphene Nanopowder:
We offer the finest quality of graphene nanopowder at a single click. Graphene Platelet: Thickness 6-8 nm and Graphene Platelet: Thickness 11-15 nm are few of them.ingle Layer Graphene:
Graphene flake is readily soluble in water and other solvents. Single layer graphene has applications in various fields like solar cells, supercapacitors, Chemical and biosensors, graphene research and many more.Single Layer Graphene Oxide in Solution:
Single Layer Graphene Oxide Dispersion is very stable and can be stored for more than one year without using a surfactant. It is suitable for the preparation of reduced graphene and graphene film.
We, at mk Nano offer you the finest quality of products at the best price. For any queries, please fill up the inquiry form available under the contact us tab. You can also reach us through email. Order from us and enjoy the excellent customer services offered!Show Less
- Functionalized Single Layer Graphene in Aqueous Solution