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Highly Efficient Method for Preparing Homogeneous and Stable Colloids Containing Graphene Oxide

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ABSTRACT

Phase transfer method has been developed for preparing homogeneous and stable graphene oxide colloids. Graphene oxide nanosheets (GONs) were successfully transferred from water to n-octane after modification by oleylamine. Corrugation and scrolling exist dominantly in the modified GONs. GONs were single layered with the maximum solubility in n-octane up to 3.82 mg mL-1. Oleylamine molecules chemically attach onto the GONs. Compared with traditional strategies, the phase transfer method has the features of simplicity and high efficiency.

No MeSH data available.


Tapping mode AFM image of GONs-OA (a) and height profiles in selected location (b).
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Figure 2: Tapping mode AFM image of GONs-OA (a) and height profiles in selected location (b).

Mentions: Figure 1 shows the typical TEM images of GONs-OA. The sizes of GONs-OA were in the range of 300–800 nm. The 2-D membrane structure will be thermodynamically stable via bending; therefore, graphene always exists in the state of corrugation and scrolling [9]. Figure 1b demonstrated the corrugation clearly, and the thickness of the corrugation was 4.3 nm (Figure 1c). The HRTEM image of the corrugated GONs-OA illustrated the graphitic lattice clearly, and the interplanar distance was measured to be 0.37 nm, corresponding to the spacing of the (002) plane. The diffraction dots were indexed to the hexagonal graphite crystal structure. The cross-sectional view of the typical AFM image of the GONs-OA (Figure 2) indicated that the average thickness of GONs-OA was about 1.3 nm, and the thickness of GONs-OA was very even. In our opinion, almost all the sheets were single-layer graphene oxide. The thickness was somewhat larger than that of single-layer GONs (0.8–1.0 nm) [24], attributed to the presence of oleylamine absorbed on both sides of GONs. This is very important because most of the fascinating properties of graphene-based composites are mainly related with their layer numbers of graphene.


Highly Efficient Method for Preparing Homogeneous and Stable Colloids Containing Graphene Oxide
Tapping mode AFM image of GONs-OA (a) and height profiles in selected location (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211982&req=5

Figure 2: Tapping mode AFM image of GONs-OA (a) and height profiles in selected location (b).
Mentions: Figure 1 shows the typical TEM images of GONs-OA. The sizes of GONs-OA were in the range of 300–800 nm. The 2-D membrane structure will be thermodynamically stable via bending; therefore, graphene always exists in the state of corrugation and scrolling [9]. Figure 1b demonstrated the corrugation clearly, and the thickness of the corrugation was 4.3 nm (Figure 1c). The HRTEM image of the corrugated GONs-OA illustrated the graphitic lattice clearly, and the interplanar distance was measured to be 0.37 nm, corresponding to the spacing of the (002) plane. The diffraction dots were indexed to the hexagonal graphite crystal structure. The cross-sectional view of the typical AFM image of the GONs-OA (Figure 2) indicated that the average thickness of GONs-OA was about 1.3 nm, and the thickness of GONs-OA was very even. In our opinion, almost all the sheets were single-layer graphene oxide. The thickness was somewhat larger than that of single-layer GONs (0.8–1.0 nm) [24], attributed to the presence of oleylamine absorbed on both sides of GONs. This is very important because most of the fascinating properties of graphene-based composites are mainly related with their layer numbers of graphene.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Phase transfer method has been developed for preparing homogeneous and stable graphene oxide colloids. Graphene oxide nanosheets (GONs) were successfully transferred from water to n-octane after modification by oleylamine. Corrugation and scrolling exist dominantly in the modified GONs. GONs were single layered with the maximum solubility in n-octane up to 3.82 mg mL-1. Oleylamine molecules chemically attach onto the GONs. Compared with traditional strategies, the phase transfer method has the features of simplicity and high efficiency.

No MeSH data available.