Skip to main content

CVD Graphene

Graphene is a two-dimensional nanomaterial which is composed of monolayers of sp2-bounded carbon atoms. Graphene has drawn considerable attention in both academic and industry area for various potential applications including semiconductors, energy storage devices, and sensors due to their physical properties such as high room-temperature mobility, high thermal conductivity.
Obtaining single layer graphene or few-layer graphene by adhesive tape or cleavage methods is not practical because these methods provide only limited opportunity for scaling up the graphene. However, the chemical vapor deposition (CVD) process has been explored to synthesis large size single crystals and uniform films of monolayer graphene and bilayer graphene. CVD is a method to produce graphene which is fast, cheap and scalable. According to the experiences of graphene synthesis, it is well known that the growth of graphene is much easier from what is called ‘seed’.
Chemical Vapor Deposition Process
CVD process is basically a method of depositing gaseous reactants onto a substrate. In CVD, pre-conditioned graphene (i.e. carbon nanotube, diamond) is scaled up by bombarding chemicals at high temperatures and pressures. The ‘seed’ (i.e. tiny pieces of actual diamond) is prepared for bombarding of chemicals. Then, high heat and pressure are applied, and chemical vapor deposit which contains carbon atoms (generally methane, CH4) is sprayed onto the seed. After some time (few days), grown graphene structure is obtained.
In CVD process there are several conditions which needs to be taken into consideration. In this prospect, the nucleation and growth mechanism of graphene on a catalytic substrate play the fundamental role in the formation of large domains and number of layers. The transition metals, alloys, and liquid metals have been recognized as the catalyst for growth of monolayer and bilayer graphene, where the surface composition of solid catalyst substrates also plays critical role on graphene growth. The thermodynamic and kinetic parameters are also crucial in graphene growth process, where pressure and temperature are both key factors.
 
To conclude, CVD is fast, cost-effective way of graphene production. Since by CVD, high quality graphene can be manufactured; it can be used in electronic applications such as creation of transistors and photovoltaic cells. In the future, CVD will be the most preferred method of synthesis of graphene.

Read more about this product:

Review of Chemical Vapor Deposition of Graphene

CVD Graphene - Monolayer Graphene on SiO2/Si Substrate

Nanografi's Horizon 2020 SME Instrument winner project: GREENGRAPHENE

Labels:

Comments

Post a Comment

Popular posts from this blog

New Way of Deaf-Mute Communication with 3D Graphene

Image retrieved from: http://blogs.rsc.org/cc/2016/09/01/3d-graphene-adds-dimension-to-deaf%E2%80%93mute-communication/ Chinese scientists have developed wearable electronic device with conductive 3D graphene structure to translate sign language into written text. This technology can be applied by injecting graphene ink from a syringe under printed electronic field. For medical field, such as adhesive patches which determine heart, brain signal and neural activity, wearable and bio-integrated medical devices are very important. Due to noticeable properties of cast graphene, for example a 2D honeycomb lattice, excellent mechanical and electrical behaviors, Graphene has an important material in warble technology. However, it is difficult to preserve advantages of Graphene material in a 3D material which has an information about forces from every angle. Yanlin Song  and co-workers at the University of the Chinese Academy of Sciences, Beijing, and Shenyang Jianzhu University...
Post a Comment
Read more

Titanium Carbide Powders and Applications

Titanium carbide which has the chemical formula of TiC attracted great interest for many structural applications due to its extremely high melting temperature, high hardness, high chemical resistance and good electrical conductivity. Therefore titanium carbide can be used in cutting tools, grinding wheels, wear-resistant coatings, high temperature heat exchangers, magnetic recording heads, turbine engine seals, and bullet-proof vests, etc. In addition, a promising field of application comprises plasma and flame spraying processes in air, where titanium carbide-based powders show high-phase stability. TiC(Titanium Carbide Powder) (325 mesh, 99,9+%)  can also be used in biomedical implant devices. Materials used for biomedical implant devices must satisfy a variety of property demands, which are often mutually exclusive. Further, different parts of a device demand different material properties. These factors often make it difficult to manufacture a medical device using a...
Post a Comment
Read more

Carbon Nanotubes Doped with Graphene Nanopowder and Applications

Carbon nanotubes and graphene are different forms of carbon atom based materials. They have different properties and can be used in various applications. But what happens if we use them as a hybrid structure? The excellent mechanical, physical, and chemical properties of low-dimensional carbon materials like graphene and carbon nanotube have enabled them as promising building blocks for three-dimensional nanoarchitectures. In this regard, extensive interests have been attracted to synthesize graphene and carbon nanotube hybrid structures. Earlier works suggested that  Carbon Nanotubes Doped with Graphene Nanopowder (52 wt% Graphene )  is a promising solution for quick energy dissipation, which could enhance interface thermal conductivity of the ‘building blocks’ for future nanoscale mechanical and electrical devices. In the electricity perspective, it is found that ‘CNT pillared-graphene’ system would extend the excellent electrical conductivity of graphene and nanotube to ...
Post a Comment
Read more