Frequency Shift in Graphene‐Enhanced Raman Signal of Molecules

Yaghobian, Fatemeh; Korn, Tobias; Schüller, Christian

doi:10.1002/cphc.201200642

Cited by 12 publications

(14 citation statements)

References 46 publications

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“…These exclude the EM as the cause for the Raman enhancement on the GaSe flake. 32 However, as compared to that on the SiO 2 /Si substrate, we do not find such Raman shift of the CuPc mode on the GaSe flake within the uncertainty of the measurement. To rule out the possible cause of the resonance Raman scattering, we further measured the Raman spectrum of CuPc on the GaSe flake using excitation light with a wavelength of 633 nm, and the result is shown in the Fig.…”

Section: Resultscontrasting

confidence: 69%

The Raman enhancement effect on a thin GaSe flake and its thickness dependence

et al. 2015

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Chemical enhancement is one of the important mechanisms in surface-enhanced Raman spectroscopy, however, its origin is still under debate. Recently, a two dimensional (2D) layered material has been thought to be a strong candidate to investigate the chemical mechanism of Raman enhancement because it has a flat surface, a well defined structure and is without the interference of electromagnetic enhancement. Herein we report systematic studies of the Raman enhancement effect on a gallium selenide (GaSe) flake by using a copper phthalocyanine (CuPc) molecule as a probe. It is found that the Raman signal of CuPc on the monolayer GaSe can be significantly increased by one order of magnitude compared to that on a SiO 2 /Si substrate. Moreover, the enhancement effect is found to decrease with increasing thickness of the GaSe flake. The origin of the Raman enhancement is attributed to the chemical mechanism resulting from the charge transfer between the GaSe flake and the detected molecules. The supposition is further verified by the investigation of the quenching photoluminescence of GaSe as well as the Raman enhancement effect of CuPc with different thicknesses on the GaSe flake.Our work will shed more light on the understanding of the chemical mechanism for Raman enhancement and expand more practical applications of GaSe.

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Section: Resultscontrasting

confidence: 69%

The Raman enhancement effect on a thin GaSe flake and its thickness dependence

et al. 2015

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“…The polarization direction for the incident light is controlled via an achromatic λ/2 plate. Other details about our Raman setup have been reported elsewhere [36]. A given CNT with nanoantennas is easily found by means of Re markers.…”

Section: Methodsmentioning

confidence: 99%

Tailored nanoantennas for directional Raman studies of individual carbon nanotubes

et al. 2015

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We exploit the near field enhancement of nanoantennas to investigate the Raman spectra of otherwise not optically detectable carbon nanotubes (CNTs). We demonstrate that a top-down fabrication approach is particularly promising when applied to CNTs, owing to the sharp dependence of the scattered intensity on the angle between incident light polarization and CNT axis. In contrast to tip enhancement techniques, our method enables us to control the light polarization in the sample plane, locally amplifying and rotating the incident field and hence optimizing the Raman signal. Such promising features are confirmed by numerical simulations presented here. The relative ease of fabrication and alignment makes this technique suitable for the realization of integrated devices that combine scanning probe, optical, and transport characterization.

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“…The unique chemical, electrical and mechanical properties of graphene can be attributed to the zero band gap and 2D honey-comb structure3.Among many applications of graphene, which include electrochemical sensors, field effect transistors, chemical catalyst, energy storage and conversion devices etc. 4, one of the promising applications is its use as a surface enhanced Raman spectroscopic (SERS) substrate and a suitable alternative for noble metals56789. Electromagnetic (EM) enhancement on the surface of graphene has been negated as its surface is relatively smooth and optical transmission through its surface is greater than 95%10.…”

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confidence: 99%

Is Chemically Synthesized Graphene ‘Really’ a Unique Substrate for SERS and Fluorescence Quenching?

Sil

Kuhar

Acharya

et al. 2013

Sci Rep

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We demonstrate observation of Raman signals of different analytes adsorbed on carbonaceous materials, such as, chemically reduced graphene, graphene oxide (GO), multi-walled carbon nanotube (MWCNT), graphite and activated carbon. The analytes selected for the study were Rhodamine 6G (R6G) (in resonant conditions), Rhodamine B (RB), Nile blue (NBA), Crystal Violet (CV) and acetaminophen (paracetamol). All the analytes except paracetamol absorb and fluoresce in the visible region. In this article we provide experimental evidence of the fact that observation of Raman signals of analytes on such carbonaceous materials are more due to resonance effect, suppression of fluorescence and efficient adsorption and that this property in not unique to graphene or nanotubes but prevalent for various type of carbon materials.

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Frequency Shift in Graphene‐Enhanced Raman Signal of Molecules

Cited by 12 publications

References 46 publications

The Raman enhancement effect on a thin GaSe flake and its thickness dependence

The Raman enhancement effect on a thin GaSe flake and its thickness dependence

Tailored nanoantennas for directional Raman studies of individual carbon nanotubes

Is Chemically Synthesized Graphene ‘Really’ a Unique Substrate for SERS and Fluorescence Quenching?

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