Spectroscopic ellipsometry of few-layer graphene

Isić, Goran; Jakovljević, Milka; Filipovic, Marko; Jovanović, Dragoljub; Vasić, Borislav; Lazović, Saša; Puаč, Nevena; Petrović, Zoran Lj.; Kostić, R.; Gajić, Radoš; Humlíček, Josef; Losurdo, Maria; Bruno, Giovanni; Bergmair, Iris; Hingerl, Kurt

doi:10.1117/1.3598162

Cited by 35 publications

(15 citation statements)

References 18 publications

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“…The analysis of graphene films by spectroscopic ellipsometry has already been carried out by other groups, and so is fairly well described [20–21]. A typical set of spectra of Ψ and Δ of graphene(−)SDS deposited on Si by alternation with PAH are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method

Walch

Nabok

Davis

et al. 2016

Beilstein J. Nanotechnol.

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SummaryIn this paper we detail a novel semi-automated method for the production of graphene by sonochemical exfoliation of graphite in the presence of ionic surfactants, e.g., sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB). The formation of individual graphene flakes was confirmed by Raman spectroscopy, while the interaction of graphene with surfactants was proven by NMR spectroscopy. The resulting graphene–surfactant composite material formed a stable suspension in water and some organic solvents, such as chloroform. Graphene thin films were then produced using Langmuir–Blodgett (LB) or electrostatic layer-by-layer (LbL) deposition techniques. The composition and morphology of the films produced was studied with SEM/EDX and AFM. The best results in terms of adhesion and surface coverage were achieved using LbL deposition of graphene(−)SDS alternated with polyethyleneimine (PEI). The optical study of graphene thin films deposited on different substrates was carried out using UV–vis absorption spectroscopy and spectroscopic ellipsometry. A particular focus was on studying graphene layers deposited on gold-coated glass using a method of total internal reflection ellipsometry (TIRE) which revealed the enhancement of the surface plasmon resonance in thin gold films by depositing graphene layers.

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Section: Resultsmentioning

confidence: 99%

Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method

Walch

Nabok

Davis

et al. 2016

Beilstein J. Nanotechnol.

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“…The structure utilized in the calculation is shown in the inset of Fig. 3(a), in which a gold nanosphere is placed above a graphene substrate with a separation of d. The dielectric constant of graphene is calculated assuming that the optical response of a single graphene layer is given by the optical sheet conductivity, and the dielectric constant of gold is from the literatures [23,24]. The calculated resonance wavelength as a function of the spacer layer thickness is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles

et al. 2012

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Shifting of the surface plasmon resonance wavelength induced by the variation of the thickness of insulating spacer between single layer graphene and Au nanoparticles is studied. The system demonstrates a blue-shift of 29 nm as the thickness of the spacer layer increases from 0 to 15 nm. This is due to the electromagnetic coupling between the localized surface plasmons excited in the nanoparticles and the graphene film. The strength of the coupling decays exponentially with a decay length of d/R=0.36, where d is the spacer layer thickness and R is the diameter of the Au nanoparticles. The result agrees qualitatively well with the plasmon ruler equation. Interestingly, a further increment of the spacer layer thickness induces a red-shift of 17 nm in the resonance wavelength and the shift saturates when the thickness of the spacer layer increases above 20 nm. 4249-4252 (1998). 22. T. Okamoto, and I. Yamaguchi, "Optical absorption study of the surface plasmon resonance in gold nanoparticles immobilized onto a gold substrate by self-assembly technique," J.

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“…2(b)). This was taken into account with an island-film model 42,43 for the transfer residue layer on the annealed graphene sample. Figs.…”

Section: Spectroscopic Ellipsometry Measurementsmentioning

confidence: 99%

Influence of transfer residue on the optical properties of chemical vapor deposited graphene investigated through spectroscopic ellipsometry

Matković

Ralević

Chhikara

et al. 2013

Journal of Applied Physics

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In this study, we have examined the effects of transfer residue and sample annealing on the optical properties of chemical vapor deposited graphene, transferred onto a sapphire substrate. The optical absorption of graphene was obtained from point-by-point inversion of spectroscopic ellipsometry measurements in the visible and ultraviolet ranges (250–800 nm). Measured spectra were analyzed by optical models based on the Fresnel coefficient equations. The optical models were supported by correlated Raman, scanning electron microscopy, and atomic force microscopy measurements. The obtained data were phenomenologically described by a Fano model. Our results show that a residue layer left on graphene can significantly increase its optical absorption in the visible range, compared to an annealed sample.

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Spectroscopic ellipsometry of few-layer graphene

Cited by 35 publications

References 18 publications

Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method

Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method

Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles

Influence of transfer residue on the optical properties of chemical vapor deposited graphene investigated through spectroscopic ellipsometry

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