Skip to main content

CVD Graphene - Monolayer Graphene on SiO2/Si Substrate

Graphene, a single-atom layer of carbon atoms packed into a two-dimensional honeycomb lattice, has many unique properties like high carrier mobility, an ultra-thin body, high sustainable current, stretchability and a high transparency, and is thus considered a promising material for device applications such as in magnetic sensors, radio frequency analogelectronics, gas sensors,photon-detectors and flexible electronics.
The most important precondition for realizing such device-level applications is scalable production of uniform high-quality monolayer graphene. Many methods have been developed to prepare graphene, for example, mechanical exfoliation, chemical vapor deposition (CVD) on metal substrates, epitaxy on silicon carbide and reduction of graphite oxide. Among these approaches, mechanical exfoliation undoubtedly provides pristine graphene with the best quality; however the extremely low efficiency hinders its application.
The CVD method is the most competing one to combine mass production and high quality potentially, and is considered the most promising method for pushing graphene into commercial products. Compared to exfoliated graphene, graphene prepared through the CVD method usually exhibits low performance, like lower mobility, greater residual impurity and higher asymmetry between n- and p-branch, while recent studies have revealed significant progress in the quality of CVD graphene through improving the growth and transfer processes. As a result, CVD graphene with a high mobility has been obtained after being transferred to the Si/SiO2 substrate.
The main aim of transferring of graphene to Si/SiO2 to increase the mobility of graphene films. If we look at the studies related to this topic we see that Monolayer Graphene on SiO2/Si Substrate (2"), has better lubrication performance compared with graphene films itself. According to the studies it can be seen that monolayer graphene on SiO2/Si substrate acts as a very good solid lubricant by the reduced coefficient of friction.
Labels:

Comments

Post a Comment

Popular posts from this blog

Usage of Silver Conductive Adhesive Paste in Corrosion Protection

In electronics, solders are main material to connect electrical components to substrates which are generally printed circuit boards. Although they are cheap, they are not effective if long term performance is considered since solders have low resistivity to corrosion relatively. Since corrosion reduce reliability, the cost of advanced technological systems such as RADAR, SONAR, LIDAR and more increase. In addition, small signals can be lost, and in huge data transfer, some of the data can be lost also especially which may lead catastrophic failures in critical systems. For instance, surface to air missiles can be launched to target which is not exist if the data coming from detection systems is noisy. Therefore, corrosion protection is necessary, and  silver conductive adhesive paste  is an essential candidate to replace PbSn solders due to its resistivity to corrosion. Silver conductive adhesive paste provide not only noisy reduction but also electromagnetic interference whi...
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

Hydroxyapatite Nanopowders and Their Applications

Hydroxyapatite, is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4 ) 3 (OH). Pure hydroxyapatite powder is white. Naturally occurring apatites can, however, also have brown, yellow, or green colorations, comparable to the discolorations of dental fluorosis. Hydroxyapatite Nanopowder/Nanoparticles (50 nm, 99.95+%)  has been widely used as a biocompatible ceramic in many areas of medicine, but mainly for contact with bone tissue, due to its resemblance to mineral bone. In mammals, the skeleton presents a carbonated and partially substituted apatite, based on nanocrystal aggregates, and associated with collagen, building up 3-D structures present in various bone tissue conformations like trabecular or cancellous bone. There has been growing interest in developing bioactive synthetic ceramics that could closely mimic natural apatite characteristics. As mentioned before,  Hydroxyapatite Nanopowder  is the main inorganic constituent of bon...
Post a Comment
Read more