Why is nitrogen doped with graphene?
Graphene is a high crystalline material possessing the high electronic qualities. Doping of nitrogen in graphene is to tailor/control the electronic, chemical and structural properties of graphene by manipulating it through the means of doping such as its surface area and functional sites.
What is n doped graphene?
Nitrogen -doped graphene ( N-graphene ) is obtained by exposing graphene to nitrogen plasma. N-graphene exhibits much higher electrocatalytic activity toward oxygen reduction and H2O2 reduction than graphene , and much higher durability and selectivity than the widely-used expensive Pt for oxygen reduction .
Is graphene N or p-type?
The characterization results revealed that CNG exhibited a few layer graphene with high N doping content of 13.4 atom %. CNG behaves like a p-type semiconductor with high carrier concentration and electrical conductivity, which is likely due to the presence of cationic N and its preserved planar structure.
Can graphene be doped?
Graphene can be doped with nitrogen, boron and other elements. Chemically doped graphenes have many novel properties. N-doped graphene can be used in photochemical water splitting and in oxygen reduction reaction.
How is graphene doped?
Surface charge transfer can be mediated by two mechanisms, electronic and electrochemical doping. The electronic doping occurs by direct exchange of electrons between graphene and the adsorbates, either atoms or molecules.
Does graphene have a band gap?
Graphene normally has a band gap of zero, which is related to its massless electrons. The narrow bandgap range means that it could now be possible to make new types of nanotransistors, nano-LEDs and other nano-optical devices in the infrared range from graphene.
Why is graphene not a metal?
What is Graphene? An allotrope of carbon, graphene exists as a two-dimensional (2D) planar sheet and can be regarded as a single atomic graphite layer. Technically, graphene is a non-metal but it is usually known as a quasi-metal because its properties are similar to that of a semi-conducting metal.
What are the applications of graphene?
Graphene has a lot of promise for additional applications: anti-corrosion coatings and paints, efficient and precise sensors, faster and efficient electronics, flexible displays, efficient solar panels, faster DNA sequencing, drug delivery, and more.
Is it possible that graphene film is transparent?
Due to the high optical transmittance and electrical conductivity, graphene is being considered a transparent conductive electrode. In addition to low-cost, graphene films have higher mechanical strength, flexibility and chemical stability than traditional electrodes made from ITO or FTO [13].
What are few applications for graphene?
Applications
- Biological Engineering. Bioengineering will certainly be a field in which graphene will become a vital part of in the future; though some obstacles need to be overcome before it can be used.
- Optical Electronics.
- Ultrafiltration.
- Composite Materials.
- Photovoltaic Cells.
- Energy Storage.
How is n doping used to make graphene?
Zhang et al. synthesized the N-doped graphene through the thermal annealing method [69], and the resultant material shows a higher electrochemical activity towards methanol oxidation than Pt. These results demonstrated that N doping can really enhance the properties of graphene as compared with those of pristine graphene.
What are the properties of doped graphene in batteries?
Chemically doped graphenes have many novel properties. N-doped graphene can be used in photochemical water splitting and in oxygen reduction reaction. N-doped graphene shows excellent performance in supercapacitors and in Li batteries. Field emission properties of doped graphene are noteworthy.
What kind of applications can graphene be used for?
Graphene has recently been studied as a promising material to replace and enhance conventional electronic materials in various fields such as electronics, photovoltaics, sensors, etc.
Which is the electrocatalyst of nitrogen doped graphene?
Peng et al. firstly reported the fabrication of nitrogen-doped (N-doped) graphene, and adopted it as the electrocatalysts in oxygen reduction reaction (ORR) [10]. It was revealed that the N-doped graphene exhibits superior electrocatalytic activity than most of other electrocatalysts.