Synthesis of Plasmonic Nanoparticles for Photo‐ and Electrocatalysis

Xie, Wei; Zhang, Kaifu; Grzeschik, Roland; Schlücker, Sebastian

doi:10.1002/9783527826971.ch3

Cited by 1 publication

(2 citation statements)

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“…In the current state of knowledge, several types of chemical reactions are distinguished that can occur on the surfaces of plasmonic structures, depending on the ability of specific substances to absorb the radiation of the used laser, the ability of the prepared nanostructures to scatter/absorb radiation and many other factors . In conjunction with SERS, which provides us first with information about individual species that are exposed to the incident laser on specific surfaces, we can observe ongoing induced molecular transformations (mainly chemical reactions) in live transmission and, in ideal cases, learn new facts about (i) the physicochemical nature of transformation (reaction mechanisms), (ii) the formation of hitherto unknown side products and transient species, − and/or (iii) structural variations of the systems (e.g., surface (dis)ordering accompanied by molecular reorientation and symmetry changes).…”

Section: Introductionmentioning

confidence: 99%

“…One of the substances that seems destined to raise a seemingly never-ending set of questions about its behavior on plasmonic surfaces is 4-aminobenzenethiol (4-ABT). ,− Spectral bands of 4-ABT often observed in the SERS spectra could not be assigned to this molecule based on the knowledge of its normal Raman spectra . The origin of these bands was initially attributed to the enormous action of the charge transfer (CT) mechanism .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser-Induced Reactions of 4-Aminobenzenthiol Species Adsorbed on Ag, Au, and Cu Plasmonic Structures Followed by SERS Spectroscopy. The Role of Substrate and Excitation Energy – Surface-Complex Photochemistry and Plasmonic Catalysis

Kopal,

Švecová,

Jeřábek

et al. 2024

ACS Omega

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This study focuses on investigating the laser-induced reactions of various surface complexes of 4-aminobenzenethiol on Ag, Au, and Cu surfaces. By utilizing different excitation wavelengths, the distinct behavior of the molecule species on the plasmonic substrates was observed. Density functional theory (DFT) calculations were employed to establish the significant role of chemical enhancement mechanisms in determining the observed behavior. The interaction between 4-aminobenzenethiol (4-ABT) molecules and plasmonic surfaces led to the formation of surface complexes with absorption bands red-shifted into the visible and near-infrared regions. Photochemical transformations were induced by excitation wavelengths from these regions, with the nature of the transformations varying based on the excitation wavelength and the plasmonic metal. Resonance with the electronic absorption transitions of these complexes amplifies surface-enhanced Raman scattering (SERS), enabling the detailed examination of ongoing processes. A kinetic study on the Ag surface revealed processes governed by both first-and second-order kinetics, attributed to the dimerization process and transformation processes of individual molecules interacting with photons or plasmons. The behavior of the molecules was found to be primarily determined by the position and variability of the band between 1170 and 1190 cm −1 , with the former corresponding to molecules in the monomer state and the latter to dimerized molecules. Notably, laser-induced dimerization occurred most rapidly on the Cu surface, followed by Ag, and least on Au. These findings highlight the influence of plasmonic surfaces on molecular behavior and provide insights into the potential applications of laser-induced reactions for surface analysis and manipulation.

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