Two different behaviors in 4-ABT and 4,4′-DMAB surface enhanced Raman spectroscopy

Shin, Dongha

doi:10.1002/jrs.5016

Cited by 9 publications

(6 citation statements)

References 42 publications

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“…The 4-NTP spectrum at 0 s displays main vibrational modes at 1082, 1332, and 1575 cm –1 , assigned to the C–H bending, NO 2 symmetric stretching, and CC stretching modes of the 4-NTP, , respectively. After few seconds, new Raman peaks appear at 1134, 1387, and 1434 cm –1 , which are assigned to the C–N symmetric stretching and the NN stretching vibrational modes of the DMAB confirming the coexistence of both molecules. , The light intensity in these experiments attains a very high value of 10 kW/cm 2 . In the rest of the paper, we use far less intensity for SERS sensing to avoid driving the chemical reaction with the SERS laser.…”

Section: Results and Discussionsupporting

confidence: 53%

“…Figure 1a shows the transmission electron microscopy images of the well-ordered template and the X-ray reflectometry (XRR) results (inset) confirming that the platform indeed consists of a large area monolayer of gold nanotriangles with a thickness of 7 ± 2 nm on silicon. In this experiment, the laser light is simultaneously 44,45 The light intensity in these experiments attains a very high value of 10 kW/cm 2 . In the rest of the paper, we use far less intensity for SERS sensing to avoid driving the chemical reaction with the SERS laser.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

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Scaling Up Nanoplasmon Catalysis: The Role of Heat Dissipation

Sarhan

Koopman²,

Pudell³

et al. 2019

J. Phys. Chem. C

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Nanoscale heating by optical excitation of plasmonic nanoparticles offers a new perspective of controlling chemical reactions, where heat is not spatially uniform as in conventional macroscopic heating but strong temperature gradients exist around microscopic hot spots. In nanoplasmonics, metal particles act as a nanosource of light, heat, and energetic electrons driven by resonant excitation of their localized surface plasmon resonance. As an example of the coupling reaction of 4-nitrothiophenol into 4,4′-dimercaptoazobenzene, we show that besides the nanoscopic heat distribution at hot spots, the microscopic distribution of heat dictated by the spot size of the light focus also plays a crucial role in the design of plasmonic nanoreactors. Small sizes of laser spots enable high intensities to drive plasmon-assisted catalysis. This facilitates the observation of such reactions by surface-enhanced Raman scattering, but it challenges attempts to scale nanoplasmonic chemistry up to large areas, where the excess heat must be dissipated by one-dimensional heat transport.

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Section: Results and Discussionsupporting

confidence: 53%

Section: ■ Results and Discussionmentioning

confidence: 90%

Scaling Up Nanoplasmon Catalysis: The Role of Heat Dissipation

Sarhan

Koopman²,

Pudell³

et al. 2019

J. Phys. Chem. C

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“…The origin of b2‐type bands of 4‐ABT has been controversial until now, and the debate has contributed to a deeper understanding of SERS enhancement mechanism. Two experimental results to support chemical enhancement mechanism regarding origin of b2‐type bands in 4‐ABT SERS were presented, and the peak growth phenomena between 4‐ABT and 4,4'‐DMAB SERS were compared . Sinwani, Muallem, and Tischler studied the effect of excitation wavelength and metallic nanostructure on SERS spectra of fullerene C 60 .…”

Section: Surface‐enhanced Raman Spectroscopymentioning

confidence: 99%

“…Two experimental results to support chemical enhancement mechanism regarding origin of b2-type bands in 4-ABT SERS were presented, and the peak growth phenomena between 4-ABT and 4,4'-DMAB SERS were compared. [32] Sinwani, Muallem, and Tischler studied the effect of excitation wavelength and metallic nanostructure on SERS spectra of fullerene C 60 . A layer of C 60 was thermally evaporated uniformly across a gold film.…”

Section: Sers Substratesmentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

J Raman Spectroscopy

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This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.

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“…However, azo coupling via a surface-catalyzed photoreaction of 4-ATP on the metal surface was controversially proposed on the basis that the calculated SERS spectra of 4,4′-dimercaptoazobenzene (4,4′-DMAB) agreed with the experimental ones of 4-ATP . In view of this controversial issue, many experimental and theoretical studies have been carefully performed focusing on these unusual peaks. − In this respect, identification of molecules on metal surfaces has been the most crucial issue for convincingly interpreting the results as arising from photoproducts of a surface-catalyzed photoreaction.…”

Section: Introductionmentioning

confidence: 99%

Surface-Catalyzed Photodissociation of (E)-4′,4‴-(Diazene-1, 2-diyl)bis(([1,1′-biphenyl]-4-carbonitrile)) Investigated by Surface-Enhanced Raman Scattering and Quantum Chemical Calculations

et al. 2019

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Aromatic azo compounds display properties crucial for important chemical applications and have been subjected to experimental and theoretical studies based on the findings of plasmon-driven azo coupling of aminobenzene derivatives. To provide spectroscopic data for plasmon-driven azo coupling of 4′-aminobiphenyl-4-carbonitrile (4AB4CN), (E)-4′,4‴-(diazene-1,2-diyl)bis(([1,1′-biphenyl]-4-carbonitrile)) (DDBBC) was synthesized by coupling of 4AB4CN and 4′-nitroso-[1,1′-biphenyl]-4-carbonitrile in acetic acid with 40% yield. Then, the ordinary Raman and surfaceenhanced Raman scattering spectra of DDBBC were measured using a 632.8 nm excitation laser and were analyzed using quantum chemical calculations for the first time. The five characteristic peaks associated with the NN bond in the measured spectra revealed that DDBBC is adsorbed on the Ag surface via interactions between the surface and the NN and CN bonds, resulting in flat orientation on the surface. Remarkably, in an acidic solution, surface-catalyzed photodissociation of DDBBC on the surface was observed, which would partially produce 4AB4CN via interaction of the amino group with protons and chloride ions, resulting in tilted adsorption through the CN bond on the surface. Herein, it was ascertained that the surface-catalyzed photoreaction between DDBBC and 4AB4CN on Ag surfaces could be reversibly pH-controlled.

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Two different behaviors in 4-ABT and 4,4′-DMAB surface enhanced Raman spectroscopy

Cited by 9 publications

References 42 publications

Scaling Up Nanoplasmon Catalysis: The Role of Heat Dissipation

Scaling Up Nanoplasmon Catalysis: The Role of Heat Dissipation

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Surface-Catalyzed Photodissociation of (E)-4′,4‴-(Diazene-1, 2-diyl)bis(([1,1′-biphenyl]-4-carbonitrile)) Investigated by Surface-Enhanced Raman Scattering and Quantum Chemical Calculations

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