Novel Micro-Raman Setup with Tunable Laser Excitation for Time-Efficient Resonance Raman Microscopy and Imaging

Stürzl, Ninette; Lebedkin, Sergei; Klumpp, Stefanie; Hennrich, Frank; Kappes, Manfred M.

doi:10.1021/ac4001833

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…To examine the temperature-dependent SERS intensities on metal NP-deposited substrate model-probe molecules of R6G with huge Raman cross sections were used. In addition, to isolate this temperature effect on the SERS effect from the resonance-enhanced Raman scattering (RRS) 38 effect, a diode laser light of 785 nm was used in this work. Fig.…”

Section: Temperature-dependent Sers Intensities On Metal Npdeposited ...mentioning

confidence: 99%

Room-temperature sensor based on surface-enhanced Raman spectroscopy

Yang

Der

et al. 2014

Analyst

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As reported in the literature, several factors, such as scattering cross sections, polarisability and wavelength suitability, contribute to increased SERS enhancement. In general, the advantage of surface-enhanced Raman scattering (SERS)-active Ag nanoparticles (NPs) is their higher SERS enhancement over Au NPs because the molar extinction coefficient of the Ag NPs is the highest of its kind among metals. Nevertheless, the corresponding SERS-active hot spots on Au are of inherently greater stability than on Ag. In this work, innovative temperature sensors based on SERS-active Au and Ag substrates prepared by sonoelectrochemical deposition-dissolution cycles (SEDDCs) are first reported. The SERS intensity of the model probe molecules of Rhodamine 6G (R6G) adsorbed on a SERS-active Ag substrate is monotonically increased from 25 to 50 °C. Moreover, this temperature-dependent intensity is linear with a slope of ca. 430 cps per °C between 25 to 45 °C. In addition, the reversibility and reusability of the developed temperature sensors are evaluated after the R6G-adsorbed sensors are alternately exposed to the temperatures of 25 and 45 °C in a sealed chamber. After every five cycles, the SERS spectra of treated substrates were recorded and compared with those of the as-prepared substrates. Experimental results indicate that SERS enhancement capability is mostly reversible based on 90% intensity of the Raman signal being maintained for the SERS-active Au substrate after 25 cycles (only 15 cycles for the Ag substrate).

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Section: Temperature-dependent Sers Intensities On Metal Npdeposited ...mentioning

confidence: 99%

Room-temperature sensor based on surface-enhanced Raman spectroscopy

Yang

Der

et al. 2014

Analyst

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“…Angle tuning was already used in early work on the REP of SWCNTs, tuning over a ≈70 nm range [38]. There is a new surge of interest in tunable filter Raman spectroscopy (TFRS); these methods are being used to obtain REMs, mainly focusing on the RBM [39][40][41]. At the same time, the performance of the latest generation of CCD detectors has improved in the near-IR range, which is ideal for the investigation of large diameter (≈1.4 nm) nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

Finnie

2016

Nano Res.

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KEYWORDSsingle walled carbon nanotube (SWCNT), tunable Raman spectroscopy, purity, metallicity ABSTRACT Tunable filter Raman spectroscopy is used to efficiently produce Raman excitation maps of unpurified and type-purified single walled carbon nanotubes (SWCNTs). Maps with fine excitation resolution (1 nm) are created over a wide wavelength range (727 to 980 nm), extending from metallic to semiconducting resonances. At a given wavelength, the wide bandwidth (>3,000 cm -1 ) allows the comparison of the G band with the radial breathing mode (RBM), and shows the 2D band and other less prominent bands. Materials examined included unsorted powders, aqueous sorted semiconductors, aqueous sorted metals, and polyfluorene sorted semiconductors in toluene. The Raman excitation profiles of the G band are broad, relative to the RBM bands. The maps offer evidence of minority species contamination, except in the case of the polyfluorene sorted semiconductors. Tunable Raman spectroscopy data help validate the simpler fixed wavelength Raman spectroscopy approaches to purity assessment.

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“…The commonly used spectroscopic methods in SWNT characterization include absorption, − photoluminescence (PL), − Rayleigh, ,, and Raman scattering − spectroscopies. Compared to other spectroscopic methods that can only provide information on E ii , Raman spectroscopy is a versatile method capable of giving additional structural information for ( n , m ) assignments, such as d t from the Raman shift of the radial breathing mode (RBM). − However, obtaining E ii from the resonance Raman excitation profile requires an expensive and labor-intensive tunable laser system. − A compromise is to use a commercial micro-Raman spectrometer equipped with several discrete laser lines ( E L ) for ( n , m ) assignments by combining the RBM position (ω RBM ) and the so-called resonance window . A resonance condition of | E L – E ii | ≤ 100 meV is empirically assumed when the RBM feature can be observed experimentally .…”

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confidence: 99%

(n,m) Assignments of Metallic Single-Walled Carbon Nanotubes by Raman Spectroscopy: The Importance of Electronic Raman Scattering

Zhang

Yang

et al. 2016

ACS Nano

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In this work, we report an accurate and convenient method that can be used to assign the chirality of all metallic single-walled carbon nanotubes (M-SWNTs). This method is designed based on the electronic Raman scattering (ERS) features, which are resonantly enhanced at the corresponding excitonic transition energies (M and M). Using this method, we are able to accurately determine the electronic property M with the resolution of a vibrational Raman spectroscopy (∼0.3 meV), which is significantly higher than that of the electronic spectroscopies (∼3 meV). We use the M splitting value, which is found insensitive to environmental changes, as a universal criteria for (n,m) assignments in various environments. As an illustrative example, simply using a commercialized Raman spectrometer with two laser lines (1.959 and 2.330 eV), we are able to unambiguously assign 18 metallic chiralities with M in the 1.6-2.3 eV range in our samples. This method provides an accurate database of M's in a similar way as photoluminescence excitation spectroscopy does for S's. It can facilitate further systematic studies on the properties of M-SWNTs with defined chirality.

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Novel Micro-Raman Setup with Tunable Laser Excitation for Time-Efficient Resonance Raman Microscopy and Imaging

Cited by 7 publications

References 24 publications

Room-temperature sensor based on surface-enhanced Raman spectroscopy

Room-temperature sensor based on surface-enhanced Raman spectroscopy

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

(n,m) Assignments of Metallic Single-Walled Carbon Nanotubes by Raman Spectroscopy: The Importance of Electronic Raman Scattering

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