Ultrahigh Vacuum Optical Spectroscopy of Chemically Functionalized Graphene Nanoribbons

Grüneis, A.; Senkovskiy, Boris V.; Fedorov, Alexander; Hell, Martin; Michel, S.

doi:10.1016/b978-0-12-409547-2.14168-x

Cited by 5 publications

(7 citation statements)

References 36 publications

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“…Samples prepared and characterized in this way have then been transferred without exposure to air to an ultra-high-vacuum (UHV) PL/Raman system [27]. Despite the MoS 2 islands are grown on a metallic substrate we were able to detect PL at low a) Ultra-high vacuum photoluminescence (PL) measurements of MoS 2 /Gr/Ir(111) during cooldown to 4 K (orange to blue color) show the expected shift with temperature.…”

Section: Luminescent Propertiesmentioning

confidence: 95%

“…5.5. Ultra-high Vacuum Raman and photoluminescence spectroscopy UHV Raman measurements were performed in the back-scattering geometry using commercial Raman systems (Renishaw) integrated in a homebuilt optical chamber [27], where the exciting and Raman scattered light were coupled into the vacuum using a 50x long-working distance microscope objective with an NA of ∼0.4 and a focal distance of 20.5 mm for lasers with wavelength 442 nm and 532 nm. For the UV laser, a UV compatible microscope objective has been used.…”

Section: Growthmentioning

confidence: 99%

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Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)

Ehlen¹,

Hall²,

Senkovskiy³

et al. 2018

2D Mater.

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We report on the observation of photoluminescence (PL) with a narrow 18 meV peak width from molecular beam epitaxy grown MoS 2 on graphene/Ir(111). This observation is explained in terms of a weak graphene-MoS 2 interaction that prevents PL quenching expected for a metallic substrate. The weak interaction of MoS 2 with the graphene is highlighted by angle-resolved photoemission spectroscopy and temperature dependent Raman spectroscopy. These methods reveal that there is no hybridization between electronic states of graphene and MoS 2 and a different thermal expansion of graphene and MoS 2 . Molecular beam epitaxy grown MoS 2 on graphene is therefore an important platform for optoelectronics which allows for large area growth with controlled properties. arXiv:1809.01886v1 [cond-mat.mes-hall] 6 Sep 2018 Narrow photoluminescence peak of epitaxial MoS 2 on graphene/Ir (111)

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Section: Luminescent Propertiesmentioning

confidence: 95%

Section: Growthmentioning

confidence: 99%

Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)

Ehlen¹,

Hall²,

Senkovskiy³

et al. 2018

2D Mater.

View full text Add to dashboard Cite

show abstract

“…Ultra-high Vacuum Raman Spectroscopy. UHV Raman measurements were performed in the backscattering geometry using commercial Raman systems (Renishaw) integrated in a home-built optical chamber, 75 where the exciting and Raman scattered light were coupled into the vacuum using a 50-times long-working distance microscope objective with an NA of ∼0.4 and a focal distance of 20.5 mm for lasers with wavelength 442 nm, 532 nm, and 633 nm. For the UV laser, UV compatible optical elements have been used.…”

Section: Nano Lettersmentioning

confidence: 99%

Resonance Raman Spectrum of Doped Epitaxial Graphene at the Lifshitz Transition

et al. 2018

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“…Photothermal synthesis and characterization of the reaction products by Raman spectroscopy are performed in situ in a home-built UHV Raman system. − This UHV Raman system was already employed to investigate hydrogenated 7-AGNRs and boron-doped GNRs . Our starting substrate is a clean, ∼200 nm thick Au(111) film on mica whose surface is prepared by sputtering and annealing .…”

Section: Resultsmentioning

confidence: 99%

Photothermal Bottom-up Graphene Nanoribbon Growth Kinetics

et al. 2020

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We present laser-induced photothermal synthesis of atomically precise graphene nanoribbons (GNRs). The kinetics of photothermal bottom-up GNR growth are unravelled by in situ Raman spectroscopy carried out in ultrahigh vacuum. We photothermally drive the reaction steps by short periods of laser irradiation and subsequently analyze the Raman spectra of the reactants in the irradiated area. Growth kinetics of chevron GNRs (CGNRs) and seven atoms wide armchair GNRs (7-AGNRs) is investigated. The reaction rate constants for polymerization, cyclodehydrogenation, and interribbon fusion are experimentally determined. We find that the limiting rate constants for CGNR growth are several hundred times smaller than for 7-AGNR growth and that interribbon fusion is an important elementary reaction occurring during 7-AGNR growth. Our work highlights that photothermal synthesis and in situ Raman spectroscopy are a powerful tandem for the investigation of on-surface reactions.

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Ultrahigh Vacuum Optical Spectroscopy of Chemically Functionalized Graphene Nanoribbons

Cited by 5 publications

References 36 publications

Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)

Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)

Resonance Raman Spectrum of Doped Epitaxial Graphene at the Lifshitz Transition

Photothermal Bottom-up Graphene Nanoribbon Growth Kinetics

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Ultrahigh Vacuum Optical Spectroscopy of Chemically Functionalized Graphene Nanoribbons

Cited by 5 publications

References 36 publications

Narrow photoluminescence and Raman peaks of epitaxial MoS 2 on graphene/Ir(1 1 1)

Narrow photoluminescence and Raman peaks of epitaxial MoS 2 on graphene/Ir(1 1 1)

Resonance Raman Spectrum of Doped Epitaxial Graphene at the Lifshitz Transition

Photothermal Bottom-up Graphene Nanoribbon Growth Kinetics

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Product

Resources

About

Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)

Narrow photoluminescence and Raman peaks of epitaxial MoS ₂ on graphene/Ir(1 1 1)