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Doping graphene films via chemically mediated charge transfer.

Ishikawa R, Bando M, Morimoto Y, Sandhu A - Nanoscale Res Lett (2011)

Bottom Line: Graphene-based TCFs have attracted a lot of attention because of their high electrical conductivity, transparency, and low cost.Notably, TCNQ is well known as a powerful electron accepter and is expected to favor electron transfer from graphene into TCNQ molecules, thereby leading to p-type doping of graphene films.Small amounts of TCNQ drastically improved the resistivity without degradation of optical transparency.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan. ishikawa.r.ab@m.titech.ac.jp.

ABSTRACT
Transparent conductive films (TCFs) are critical components of a myriad of technologies including flat panel displays, light-emitting diodes, and solar cells. Graphene-based TCFs have attracted a lot of attention because of their high electrical conductivity, transparency, and low cost. Carrier doping of graphene would potentially improve the properties of graphene-based TCFs for practical industrial applications. However, controlling the carrier type and concentration of dopants in graphene films is challenging, especially for the synthesis of p-type films. In this article, a new method for doping graphene using the conjugated organic molecule, tetracyanoquinodimethane (TCNQ), is described. Notably, TCNQ is well known as a powerful electron accepter and is expected to favor electron transfer from graphene into TCNQ molecules, thereby leading to p-type doping of graphene films. Small amounts of TCNQ drastically improved the resistivity without degradation of optical transparency. Our carrier doping method based on charge transfer has a huge potential for graphene-based TCFs.

No MeSH data available.


Images of synthesized GO flakes. (a) Optical microscope image of synthesized GO flakes, (b) AFM height image of monolayer GO flakes, and (c) line profile in image (b).
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Figure 2: Images of synthesized GO flakes. (a) Optical microscope image of synthesized GO flakes, (b) AFM height image of monolayer GO flakes, and (c) line profile in image (b).

Mentions: Large GO flakes (over 30 × 30 μm2) were present in the GO aqueous dispersion as shown in Figure 2a. The surface morphology of these flakes was measured to be atomically thin (0.4 nm) two-dimensional (2D) structure using AFM as shown in Figure 2b,c, indicating the presence of monolayer of GO. In addition, a Raman peak shift and peak shape of second-order two phonons process peak at 2700 cm-1, referred to as the 2D band, which indicates about 25% of GO flakes were single layer of carbon as demonstrated in our previous article [14].


Doping graphene films via chemically mediated charge transfer.

Ishikawa R, Bando M, Morimoto Y, Sandhu A - Nanoscale Res Lett (2011)

Images of synthesized GO flakes. (a) Optical microscope image of synthesized GO flakes, (b) AFM height image of monolayer GO flakes, and (c) line profile in image (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211156&req=5

Figure 2: Images of synthesized GO flakes. (a) Optical microscope image of synthesized GO flakes, (b) AFM height image of monolayer GO flakes, and (c) line profile in image (b).
Mentions: Large GO flakes (over 30 × 30 μm2) were present in the GO aqueous dispersion as shown in Figure 2a. The surface morphology of these flakes was measured to be atomically thin (0.4 nm) two-dimensional (2D) structure using AFM as shown in Figure 2b,c, indicating the presence of monolayer of GO. In addition, a Raman peak shift and peak shape of second-order two phonons process peak at 2700 cm-1, referred to as the 2D band, which indicates about 25% of GO flakes were single layer of carbon as demonstrated in our previous article [14].

Bottom Line: Graphene-based TCFs have attracted a lot of attention because of their high electrical conductivity, transparency, and low cost.Notably, TCNQ is well known as a powerful electron accepter and is expected to favor electron transfer from graphene into TCNQ molecules, thereby leading to p-type doping of graphene films.Small amounts of TCNQ drastically improved the resistivity without degradation of optical transparency.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan. ishikawa.r.ab@m.titech.ac.jp.

ABSTRACT
Transparent conductive films (TCFs) are critical components of a myriad of technologies including flat panel displays, light-emitting diodes, and solar cells. Graphene-based TCFs have attracted a lot of attention because of their high electrical conductivity, transparency, and low cost. Carrier doping of graphene would potentially improve the properties of graphene-based TCFs for practical industrial applications. However, controlling the carrier type and concentration of dopants in graphene films is challenging, especially for the synthesis of p-type films. In this article, a new method for doping graphene using the conjugated organic molecule, tetracyanoquinodimethane (TCNQ), is described. Notably, TCNQ is well known as a powerful electron accepter and is expected to favor electron transfer from graphene into TCNQ molecules, thereby leading to p-type doping of graphene films. Small amounts of TCNQ drastically improved the resistivity without degradation of optical transparency. Our carrier doping method based on charge transfer has a huge potential for graphene-based TCFs.

No MeSH data available.