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Mega-electron-volt proton irradiation on supported and suspended graphene: A Raman spectroscopic layer dependent study
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10.1063/1.3647781
/content/aip/journal/jap/110/8/10.1063/1.3647781
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3647781

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Raman spectrum from a (a) pristine monolayer graphene and irradiated monolayer graphene at fluences of (b) 1 × 1015 ions/cm2 and (c) 1 × 1016 ions/cm2. Threshold fluence for observation of ion damage is ∼ 1 × 1016 ions/cm2.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Optical micrograph of the graphene flake with 1, 2, 4, and a 1 + 1 folded graphene layers. (b) The corresponding Raman microscopy image using the FWHM of 2D peak. The graphene layer numbers are labeled in both (a) and (b).

Image of FIG. 3.
FIG. 3.

(Color online) Raman microscopy image created using the I(D)/I(G) ratio of the graphene sample in Fig. 2 irradiated at fluence of (a) 1 × 1017 ions/cm2, (b) 1 × 1018 ions/cm2, and (c) 6 × 1018 ions/cm2, respectively. The layer numbers are indicated in (a). (The colour contrast is enhanced in all the panels.)

Image of FIG. 4.
FIG. 4.

(Color online) Panel A—Raman spectrum from (a) pristine monolayer graphene and the same sample irradiated at fluences of (b) 1 × 1017 ions/cm2, (c) 1 × 1018 ions/cm2, and (d) 6 × 1018 ions/cm2; the corresponding fitted curve with constituent peaks and experimental points are shown in (e)–(h). Panels (B)–(E) correspond to the same for a 2 layer graphene, folded 1 + 1 graphene, 4-layer graphene, and graphite, respectively.

Image of FIG. 5.
FIG. 5.

(Color online) Panel-A—UV Raman spectrum from (a) a pristine monolayer graphene and irradiated graphene at fluences of (b) 1 × 1017 ions/cm2, (c) 1 × 1018 ions/cm2, and (d) 6 × 1018 ions/cm2; the fitted spectrum with constituent peaks and experimental points are shown in (d)–(f). Panels (B)–(D) correspond to the same for a 2-layer, 4-layer, and graphite samples.

Image of FIG. 6.
FIG. 6.

(Color online) Optical micrograph of suspended (a) monolayer graphene sample and (c) three layer graphene sample. The corresponding Raman Microscopy image created using the I(2D)/I(G) ratio of (b) monolayer, (d) 3-layer graphene sample. The suspended graphene region is indicated using arrows in all the panels.

Image of FIG. 7.
FIG. 7.

(Color online) Raman microscopy image of the graphene sample in Fig. 6 irradiated at a fluence of 1 × 1018 ions/cm2. The I(D)/I(G) ratio and the I(2D)/I(G) ratio of the suspended monolayer graphene sample is given in panels (a) and (b), respectively. Panels (c) and (d) correspond to the same for a 3-layer suspended graphene sample. The suspended graphene region is marked using a dashed circle.

Image of FIG. 8.
FIG. 8.

(Color online) Raman microscopy image of the graphene sample in Fig. 6 irradiated at a fluence of 1 × 1019 ions/cm2. The I(D)/I(G) ratio and the I(2D)/I(G) ratio of the suspended monolayer graphene sample is given in panels (a) and (b) respectively. Panels (c) and (d) corresponds to the same for a three layer suspended graphene sample. The suspended graphene region is marked using a dashed circle.

Image of FIG. 9.
FIG. 9.

Panel-A—Raman spectrum from a (a) pristine monolayer suspended graphene and irradiated monolayer suspended graphene at fluences of (b) 1 × 1018 ions/cm2 and (c) 1 × 1019 ions/cm2; the fitted spectrum with constituent peaks are shown in (d)–(f). Panel B corresponds to the same for a 3-layer suspended graphene sample.

Tables

Generic image for table
Table I.

The dispersion of D and 2D peaks in cm−1/eV calculated using 532 nm and 325 nm excitations.

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/content/aip/journal/jap/110/8/10.1063/1.3647781
2011-10-21
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mega-electron-volt proton irradiation on supported and suspended graphene: A Raman spectroscopic layer dependent study
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3647781
10.1063/1.3647781
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