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2 article(s) from Pollard, Andrew J

Time of flight secondary ion mass spectrometry imaging of contaminant species in chemical vapour deposited graphene on copper

Barry Brennan,
Vlad-Petru Veigang-Radulescu,
Philipp Braeuninger-Weimer,
Stephan Hofmann and
Andrew J. Pollard

Beilstein J. Nanotechnol. 2026, 17, 200–213, doi:10.3762/bjnano.17.13

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Figure 1: Representative ToF-SIMS surface images (500 µm × 500 µm) of C₂⁻ (red), C₄⁻ (green), and C₆⁻ (blue) ...

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Figure 2: ToF-SIMS surface images (500 µm × 500 µm) of substrate-related Cu⁻ (red), CuH₂O₂⁻ (green) and Cu₂H₃O...

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Figure 3: ToF-SIMS depth profile images of graphene grown on copper foils utilising different graphene growth...

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Figure 4: ToF-SIMS images (4 mm x 4 mm) from the surface of the BO sample, showing in (a) the C₂⁻ graphene-re...

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Figure 5: ToF-SIMS surface images (500 µm × 500 µm) of the F⁻ (red), Cl⁻ (green), and CuFCl⁻ (blue) ion signa...

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Figure 6: ToF-SIMS depth profiles from (a) back side oxidation + Ar annealed (BO), (b) Ar:H₂ annealed (Ar:H₂)...

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Figure 7: ToF-SIMS surface images (500 µm × 500 µm) from the BO sample showing (a) C_n⁻ species related to gra...

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Figure 8: XPS spectra from the Ar annealed, and back side oxidation + Ar annealed samples prior to graphene g...

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Figure 9: 3D ToF-SIMS images (150 µm × 150 µm) of a 200 nm PVD high-purity copper layer deposited on top of a...

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Full Research Paper

Published 21 Jan 2026

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On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets

Keith R. Paton,
Konstantinos Despotelis,
Naresh Kumar,
Piers Turner and
Andrew J. Pollard

Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42

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Figure 1: (A) Example AFM image of flakes from the GNP_ref sample; the scale bar is 2 μm. (B) Example SEM imag...

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Figure 2: (A) Averaged spectra from samples of GNP_ref with additions of graphite. The bottom spectrum (blue) ...

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Figure 3: Fitted peak intensity ratios. (A) I_D/I_G and (B) I_2D/I_G, showing the values from the averaged spectr...

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Figure 4: Median value of the graphite component loading value, as determined by a non-negative least-squares...

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Figure 5: Comparison of literature metrics applied to the current data. (A) Mean number of layers calculated ...

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Figure 6: (A) Averaged spectra from samples of GNP_ref with additions of sediment. Bottom spectrum (blue) is s...

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Figure 7: Values of the metrics at each sediment loading. (A) I_D/I_G intensity ratio; (B) I_2D/I_G intensity rat...

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Figure 8: Estimated sediment content calculated from the fraction of measured spectra that are “sediment-like...

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Figure 9: (A) Optical image of mapped area of sample with 65 wt % sediment added. Each coloured box shows a s...

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Published 24 Apr 2023

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