Fluorinated Graphene Nanoplatelets

Fluorinated Graphene Nanoplatelets: GF-6 is first of a new line of halogenated graphene materials. Fluorinated graphene is a novel graphene derivative. The formation of covalent C-F bonds is accompanied by sp2 to sp3 structural transition of C-C bonds. This results in improved surface activity as well as processability of GNPs. Unlike graphene, GF-6 displays better dispersibility in polar solvents such as DMA, THF, etc. Depending on the F/C ratio, the material exhibits a range from metallic to semiconducting to insulating electronic behavior. GF-6 contains 6 at. % of fluorine and comprised of an average of 37 graphene layers. Our material can be utilized in various applications such as batteries, nanocomposites, epoxies, etc.

Microstructure of Fluorinated GNPs:

The microstructure of GF-6 has been investigated by the SEM and TEM Imaging. The flakes show wrinkled paper-like structure with a lateral size ranging from 1 μm to 5 μm. The average number of graphene layers obtained from TEM is about 37 layers that is in agreement with flake thickness calculated from surface area measured by Brunauer-Emmett-Teller (BET) technique.

Graphene Oxide SEM Image

SEM image showing GF-6 on Lacey carbon support.

Graphene Oxide SEM Image

Bright-field TEM image showing GF-6 obtained at 100 keV.

X-ray Photoelectron Spectroscopy (XPS):

In order to analyze the chemical modification of graphene by fluorine, the X-ray Photoelectron Spectroscopy (XPS) has been performed. As expected, in addition to C 1s and O 1s peaks a distinct F 1s peak is detected. A minor oxygen band is attributed to the physically absorbed oxygen on GF-6 surfaces. The content of fluorine in GF-6 is about 6%.

Graphene Oxide SEM Image

Survey XPS spectra of GF-6.

Raman Spectroscopy:

Raman spectroscopy was used for structural assessment of GF-6. In comparison to graphite (red line) that exhibits a distinct G line due to its highly oriented nature, GF-6 shows three signature bands: D band (1350 cm-1), G band (1585 cm-1), and 2D band (2700 cm-1). A strong D band corresponds to edge defects introduced by fluorination and subsequent exfoliation.

Graphene Oxide SEM Image

Raman spectra of pristine graphite (red) and GF-6 (black).

Electrical Properties:

In GF-6, a polar covalent C-F bonds form due to the high electronegativity of fluorine. As a result, the material exhibits a metallic behavior that is common for fluorinated graphene at low F concentration [1] and as can also be inferred from FTIR analysis. Although, by introducing a small percentage of F results in the shift in band gap opening, the polarity of C-F bonds still promotes a metal-like behavior. In addition, unlike inert graphene, the presence of F and O surface groups leads to its good dispersibility in number of polar solvents such as THF, DMF, etc. [2]

Applications:

Energy conversion and storage devices

Electrochemical sensors

Biology and medicine

Composite materials

Fluorinated Graphene Quantum Dots

Epoxies

We recommend this product be stored in a dry environment and tightly sealed in a container with a desiccant included.

Fluorinated graphene is considered as one of important ultrathin solid lubricants or lubricant additive of lubricating oils, lubricating coatings and anti-wear composites because of its low friction coefficient and high durability.

dddq

Key Features

  • Form: Dry powder
  • Composition: CF0.06
  • Thickness: average 37 graphene layers
  • 12 nmr
  • Planar size: 1 μm - 5 μm
  • Specific Surface Area: 65m2/g
Softouchwplk Top