Fig. 1A shows the optical image of GIC of 100 meshes with
metallic luster. Fig. 1B is the SEM image of the GIC, from which it
shows that the GIC has layered structure, with the size of about
200 mm. Fig. 1C is the SEM image of the worm-like graphite was
obtained by expanding the GIC in the furnace of 920 C. It is obvious
that the volume of the worm-like graphite is hundreds of times
larger than that of the GIC, which is attributed to some substances
(General chemical name: XCy) in the GIC interlayer decomposed gas during the high-temperature treatment. Fig. 1D is the SEM
image of the 200 mesh layered structure natural graphite powder
with the size of 70 mm. However, there are still some little smaller
size particles.
Fig. 2A is the SEM image of the graphite nanoflake which is
fabricated by fast dispersing the worm-like graphite. From the
picture we can find the graphite nanoflake has good layered
structure and not with too many wrinkles. Fig. 2B is the TEM image
of the graphite nanoflake on the copper micro grid, from which we
can see the graphite nanoflake has not good transmittance, which
indicates that the graphite nanoflake is a thin film. We can determine
the thickness of the graphite nanoflake by high resolution
transmission electron microscopy (HRTEM) as shown in Fig. 2C. The
yellow arrow denotes the thickness of a piece of the graphite
nanoflake, about 20 nm with ~50 layers. Fig. 2D is the SEM image of
the as-prepared graphene sheet, from which we can see that the graphene sheet fabricated by ourselves is a kind of very thin material
with layered structure, the size about ten micrometers and
many wrinkles can be observed on the sheets. The thickness of the
graphene sheet is more clearly as shown in Fig. 2E. It is obvious that
the graphene sheet has good transmittance, better than that of the
graphite nanoflake. And the exact thickness of the prepared graphene
sheet is about 1.5 nm with three graphene layers (the red
circle) as shown HRTEM image in Fig. 2F, which is in excellent
agreement with other former studies [41,42].
Fig. 1A shows the optical image of GIC of 100 meshes with
metallic luster. Fig. 1B is the SEM image of the GIC, from which it
shows that the GIC has layered structure, with the size of about
200 mm. Fig. 1C is the SEM image of the worm-like graphite was
obtained by expanding the GIC in the furnace of 920 C. It is obvious
that the volume of the worm-like graphite is hundreds of times
larger than that of the GIC, which is attributed to some substances
(General chemical name: XCy) in the GIC interlayer decomposed gas during the high-temperature treatment. Fig. 1D is the SEM
image of the 200 mesh layered structure natural graphite powder
with the size of 70 mm. However, there are still some little smaller
size particles.
Fig. 2A is the SEM image of the graphite nanoflake which is
fabricated by fast dispersing the worm-like graphite. From the
picture we can find the graphite nanoflake has good layered
structure and not with too many wrinkles. Fig. 2B is the TEM image
of the graphite nanoflake on the copper micro grid, from which we
can see the graphite nanoflake has not good transmittance, which
indicates that the graphite nanoflake is a thin film. We can determine
the thickness of the graphite nanoflake by high resolution
transmission electron microscopy (HRTEM) as shown in Fig. 2C. The
yellow arrow denotes the thickness of a piece of the graphite
nanoflake, about 20 nm with ~50 layers. Fig. 2D is the SEM image of
the as-prepared graphene sheet, from which we can see that the graphene sheet fabricated by ourselves is a kind of very thin material
with layered structure, the size about ten micrometers and
many wrinkles can be observed on the sheets. The thickness of the
graphene sheet is more clearly as shown in Fig. 2E. It is obvious that
the graphene sheet has good transmittance, better than that of the
graphite nanoflake. And the exact thickness of the prepared graphene
sheet is about 1.5 nm with three graphene layers (the red
circle) as shown HRTEM image in Fig. 2F, which is in excellent
agreement with other former studies [41,42].
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