Ultrafast charge transfer in surface-enhanced Raman scattering (SERS) processes using transient reflecting grating (TRG) spectroscopy

Shibamoto, Kohei; Katayama, Kenji; Sawada, Tsuguo

doi:10.1016/j.cplett.2006.11.036

Cited by 16 publications

(19 citation statements)

References 31 publications

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“…102 (2) Additionally, transient reflecting grating spectroscopy studies employing a 1 kHz ultrafast laser determined that most chemisorbed crystal violet molecules received charge transfer electrons from the metal upon excitation with green laser light close in energy to the interband transition of gold. 103 The charge transfer was possibly due to the excitation of valence electrons residing close to the Fermi level to adsorption energy states of the molecules. 103 The theoretical resonance Raman spectra of the trans-BPE conformer of the anion radical shows significant spectral differences compared to the neutral form as demonstrated in Figure 5.…”

Section: ■ Discussionmentioning

confidence: 99%

Photoinduced Plasmon-Driven Chemistry in trans-1,2-Bis(4-pyridyl)ethylene Gold Nanosphere Oligomers

et al. 2018

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Continuous wave (CW) pump-probe surface-enhanced Raman spectroscopy (SERS) is used to examine a range of plasmon-driven chemical behavior in the molecular SERS signal of trans-1,2-bis(4-pyridyl)ethylene (BPE) adsorbed on individual Au nanosphere oligomers (viz., dimers, trimers, tetramers, etc.). Well-defined new transient modes are caused by high fluence CW pumping at 532 nm and are monitored on the seconds time scale using a low intensity CW probe field at 785 nm. Comparison of time-dependent density functional theory (TD-DFT) calculations with the experimental data leads to the conclusion that three independent chemical processes are operative: (1) plasmon-driven electron transfer to form the BPE anion radical; (2) BPE hopping between two adsorption sites; and (3) trans-to- cis-BPE isomerization. Resonance Raman and electron paramagnetic resonance (EPR) spectroscopy measurements provide further substantiation for the observation of an anion radical species formed via a plasmon-driven electron transfer reaction. Applications of these findings will greatly impact the design of novel plasmonic devices with the future ability to harness new and efficient energetic pathways for both chemical transformation and photocatalysis at the nanoscale level.

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Section: ■ Discussionmentioning

confidence: 99%

Photoinduced Plasmon-Driven Chemistry in trans-1,2-Bis(4-pyridyl)ethylene Gold Nanosphere Oligomers

et al. 2018

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“…According to ref. 13, the SERS enhancement factor was roughly proportional to the number density of CT electrons (= CT effect). This means that the EM effect of each sample (CV/AuNP, RB/AuNP and MG/AuNP) contributes to SERS enhancement factor equally in his experiment.…”

Section: Resultsmentioning

confidence: 99%

“…The reason for a choice of the band is that the C-C stretching band is common among all sample molecules in our experiment and is not shifted by adsorption. On the other hand, co-author, Shibamoto, had reported that the SERS enhancement factor strongly depends on the number density of CT electrons and the density decreased in order of CV/AuNP, RB/AuNP and MG/AuNP [13]. Generally, it is known that the SERS enhancement factor is proportional to the square of the electromagnetic intensity, which is the origin of the EM effect, and the square of the Raman tensor, which is the origin of the CT effect.…”

Section: Resultsmentioning

confidence: 99%

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Ionization Mechanism in Surface Plasmon Enhanced Laser Desorption/Ionization

Nagoshi

Sakata

Shibamoto

et al. 2009

e-J. Surf. Sci. Nanotechnol.

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We researched contribution of a charge transfer (CT) effect to desorption/ionization mechanism in our ultra-high sensitive laser desorption/ionization mass spectrometry based on surface plasmon (SP) excitation (SPLDI-MS). A quantity of CT electrons between a metal surface and sample molecules estimated from Raman measurement is correlated to a mass signal intensity of sample molecule in our SPLDI-MS method. A sample system with a larger quantity of CT electrons gave a higher mass signal intensity. Efficient use of the CT effect would lead to development of a higher sensitive SPLDI-MS and this development would contribute to advancement of various fields.

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“…These new developments build off of numerous previous works in the field which examined properties including picosecond dynamics, 18,19 tip-enhanced coherent Raman spectroscopy, 20 ultrafast decay rates, 21 and ultrafast charge-transfer. 22 This paper begins with a discussion of the electromagnetic field enhancement mechanism of SERS, followed by a discussion of the relevant time scales of coupled molecular-plasmonic system dynamics and the advantages of probing these systems with ultrafast spectroscopies. Section 2 discusses three recent demonstrations of ultrafast SERS, consisting of SE-FSRS, SE-CARS, and TR-SE-CARS.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast surface-enhanced Raman spectroscopy

Keller

Brandt

Cassabaum

et al. 2015

Analyst

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Ultrafast surface-enhanced Raman spectroscopy (SERS) with pico- and femtosecond time resolution has the ability to elucidate the mechanisms by which plasmons mediate chemical reactions. Here we review three important technological advances in these new methodologies, and discuss their prospects for applications in areas including plasmon-induced chemistry and sensing at very low limits of detection. Surface enhancement, arising from plasmonic materials, has been successfully incorporated with stimulated Raman techniques such as femtosecond stimulated Raman spectroscopy (FSRS) and coherent anti-Stokes Raman spectroscopy (CARS). These techniques are capable of time-resolved measurement on the femtosecond and picosecond time scale and can be used to follow the dynamics of molecules reacting near plasmonic surfaces. We discuss the potential application of ultrafast SERS techniques to probe plasmon-mediated processes, such as H2 dissociation and solar steam production. Additionally, we discuss the possibilities for high sensitivity SERS sensing using these stimulated Raman spectroscopies.

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Ultrafast charge transfer in surface-enhanced Raman scattering (SERS) processes using transient reflecting grating (TRG) spectroscopy

Cited by 16 publications

References 31 publications

Photoinduced Plasmon-Driven Chemistry in trans-1,2-Bis(4-pyridyl)ethylene Gold Nanosphere Oligomers

Photoinduced Plasmon-Driven Chemistry in trans-1,2-Bis(4-pyridyl)ethylene Gold Nanosphere Oligomers

Ionization Mechanism in Surface Plasmon Enhanced Laser Desorption/Ionization

Ultrafast surface-enhanced Raman spectroscopy

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