What are nitrogen doped quantum dots?
Nitrogen-doped carbon quantum dots (NCQDs) have been synthesized by the hydrothermal method with microcrystalline cellulose as carbon source and ethylenediamine as nitrogen dopant. The synthesized NCQDs were characterized by FT-IR, TEM, XPS, UV-vis, XRD and fluorescence emission spectroscopy.
What is nitrogen 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 .
How do you make graphene in n doped?
1 Thermal Treatment. Thermal treatment refers to the method using high temperature to produce N-graphene. It has been shown that heating graphene in NH3 at high temperature (≥800 °C) can produce N-graphene. (59, 60) Electrical annealing, which produces high temperature, has also been applied to obtain N-GNRs.
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. N-doped graphene shows excellent performance in supercapacitors and in Li batteries.
What is meant by graphene oxide?
Graphene oxide (GO) is a unique material that can be viewed as a single monomolecular layer of graphite with various oxygen-containing functionalities such as epoxide, carbonyl, carboxyl, and hydroxyl groups.
What is the structure of graphene oxide?
The graphene oxide molecular structure consists of carbon, hydrogen and oxygen. One of the most important traits of GO is that it can be produced using graphite (since it is inexpensive) using different chemical methods, yielding a high production with exceptional cost-efficiency.
How is graphene oxide made?
Graphene oxide is effectively a by-product of this oxidisation as when the oxidising agents react with graphite, the interplanar spacing between the layers of graphite is increased. The completely oxidised compound can then be dispersed in a base solution such as water, and graphene oxide is then produced.
What is the molecular structure of graphene?
graphene, a two-dimensional form of crystalline carbon, either a single layer of carbon atoms forming a honeycomb (hexagonal) lattice or several coupled layers of this honeycomb structure.
What is graphene oxide made from?
Graphene oxide (GO) is the oxidized form of graphene. It is a single-atomic-layered material that is formed by the oxidation of graphite which is cheap and readily available. Graphene oxide is easy to process since it is dispersible in water and other solvents.
What is graphene oxide?
What’s graphene oxide used for?
Graphene oxide (GO), an oxidized derivative of graphene, is currently used in biotechnology and medicine for cancer treatment, drug delivery, and cellular imaging. Also, GO is characterized by various physicochemical properties, including nanoscale size, high surface area, and electrical charge.
What is another name for graphene oxide?
Description. Graphene oxide (GO), also referred to as graphite/graphitic oxide, is obtained by treating graphite with oxidisers, and results in a compound of carbon, oxygen, and hydrogen in variable ratios.
How do nitrogen-doped graphene oxide quantum dots work?
Nitrogen-doped graphene oxide quantum dots exhibit both p- and n-type conductivities and catalyze overall water-splitting under visible-light irradiation. The quantum dots contain p-n type photochemical diodes, in which the carbon sp(2) clusters serve as the interfacial junction. The active sites fo …
Are graphene quantum dots anodic materials for Li ion batteries?
Li, Ti, N and Sco-doped graphene quantum dots (LTO/N,S-GQDs) were shown as an anodic material for Li ion batteries [ 218 ].
Can graphene quantum dots (GQDs) be synthesized by laser ablation?
Yes In this work, graphene quantum dots (GQDs) were synthesized by femtosecond laser ablation in liquid using laser induced graphene as the carbon source. Nitrogen-doped graphene quantum dots (N-GQDs) were successfully synthesized by adding ammonia water to the graphene suspension.
How do nitrogen-based defects in graphene affect the work function?
Nitrogen-based defects in graphene increase the π state density near Fermi level, which reduces the work function.