Raman spectra and DFT calculations of thiophenol molecules adsorbed on a gold surface

Merlen, Alexandre; Berthomieu, Dorothée; Edely, Mathieu; Rérat, Michel

doi:10.1039/d2cp04157j

Cited by 8 publications

(5 citation statements)

References 52 publications

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“…The recorded Raman spectra for the range between 220 to 2000 cm −1 distinctly exhibited the characteristic peaks of thiophenol. These peaks were observed at 419, 998, 1022, 1073, and 1574 cm −1 , aligning with previous research findings [49][50][51]. The results showed that the intensity of the Raman signal was significantly increased using different LIPSS.…”

Section: Sers Outcomes Across Lipss Stagessupporting

confidence: 91%

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS)

Vaghasiya,

Miclea

2023

Optics

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Laser-induced periodic surface structures (LIPSS) have gained significant attention due to their ability to modify the surface morphology of materials at the micro-nanoscale and show great promise for surface functionalization applications. In this study, we specifically investigate the formation of LIPSS in silicon substrates and explore their impact on surface-enhanced Raman spectroscopy (SERS) applications. This study reveals a stepwise progression of LIPSS formation in silicon, involving three distinct stages of LIPSS: (1) integrated low-spatial-frequency LIPSS (LSFL) and high-spatial-frequency LIPSS (HSFL), (2) principally LSFL and, (3) LSFL at the edge of the irradiated spot, elucidating the complex interplay between laser fluence, pulse number, and resulting surface morphology. Furthermore, from an application standpoint, these high-quality multi-scale periodic patterns lead to the next step of texturing the entire silicon surface with homogeneous LIPSS for SERS application. The potential of LIPSS-fabricated silicon substrates for enhancing SERS performance is investigated using thiophenol as a test molecule. The results indicate that the Au-coated combination of LSFL and HSFL substrates showcased the highest enhancement factor (EF) of 1.38×106. This pronounced enhancement is attributed to the synergistic effects of localized surface plasmon resonance (LSPR) and surface plasmon polaritons (SPPs), intricately linked to HSFL and LSFL characteristics. These findings contribute to our understanding of LIPSS formation in silicon and their applications in surface functionalization and SERS, paving the way for sensing platforms.

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Section: Sers Outcomes Across Lipss Stagessupporting

confidence: 91%

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS)

Vaghasiya,

Miclea

2023

Optics

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“…The recorded Raman spectra for the range between 220 to 2000 cm −1 distinctly exhibited the characteristic peaks of thiophenol. These peaks were observed at 419, 998, 1022, 1073, and 1574 cm −1 , aligning with previous research findings [44][45][46]. The results showed that the intensity of the Raman signal was significantly increased using different LIPSS.…”

Section: Sers Outcomes Across Lipss Stagessupporting

confidence: 91%

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS) Applications

Vaghasiya,

Miclea

2023

Preprint

View full text Add to dashboard Cite

Laser-induced periodic surface structures (LIPSS) have gained significant attention due to their ability to modify the surface morphology of materials at the micro-nanoscale and show great promise for surface functionalization application. In this study, we specifically investigate the formation of LIPSS in silicon substrates and explore their impact on Surface-Enhanced Raman Spectroscopy (SERS) applications. This study reveals a stepwise progression of LIPSS formation in silicon, involving three distinct stages of LIPSS: 1) integrated Low-Spatial-Frequency LIPSS (LSFL) and High-Spatial-Frequency LIPSS (HSFL), 2) principally LSFL and 3) LSFL at the edge of the irradiated spot, elucidating the complex interplay between laser fluence, pulse number, and resulting surface morphology. Furthermore, from an application standpoint, these high-quality multi-scale periodic patterns lead to the next step of texturing the entire silicon surface with homogeneous LIPSS for SERS application. The potential of LIPSS-fabricated silicon substrates for enhancing SERS performance is investigated using thiophenol as a test molecule. The results indicate that the Au-coated combination of LSFL and HSFL substrate showcased the highest enhancement factor (EF) of 1.38 × 10^6. This pronounced enhancement is attributed to the synergistic effects of Localized Surface Plasmon Resonance (LSPR) and Surface Plasmon Polaritons (SPPs), intricately linked to HSFL and LSFL characteristics. These findings contribute to understanding LIPSS formation in silicon and their applications in surface functionalization and SERS, paving the way for sensing platforms.

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“…It is notable that all the peaks in the SERS as well as in the Raman spectra are assigned to in-plane vibration modes. 46,47) Second, it is expected from density functional theory (DFT) calculations that the tilting angle of adsorbed molecules can influence the vibrational modes so to change the SERS spectrum dramatically and the effect is minimized in vertical alignment condition. 44,45) Even though the theory is not supported by sound experimental observations, it seems to deserve enough consideration in interpreting every spectrum change.…”

Section: Sers Spectrummentioning

confidence: 99%

High sensitive SERS film of Ag-coated aggregated nanowire structure and benzene gas detection

Oh,

Kim,

Gupta

et al. 2024

Jpn. J. Appl. Phys.

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A highly sensitive SERS (surface-enhanced Raman spectroscopy) film was fabricated based on anodic aluminum oxide (AAO) template and Ag coating techniques. The array of alumina nanowires of ~ 5 μm length and 26 nm thickness was fabricated and then made collapse to build a micro-scale funnel array, where each cell consists of hundreds of nanowires. Ag film was deposited on the nanowire structure by thermal evaporation. Due to numerous tapered nanogaps and efficient illumination of incident light in the micro-funnel structures, Raman signal enhancement factor (E.F.) as high as ~ 3·10^7 could be obtained at 785 nm. The SERS film functionalized by 1-propanethiol was used for benzene gas detection, where the sensitivity ~ 0.3 ppm (3-μ) was realized within 120 s. This nanostructure is expected to be widely used for high sensitive chemical and bio-sensors and have higher E.F. when the morphology is optimized further.

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Raman spectra and DFT calculations of thiophenol molecules adsorbed on a gold surface

Abstract: We report the calculation of Raman modes of thiophenol molecules deposited on a real gold surface. The calculated Raman spectra strongly depend on the absorption configuration of the molecule on...

Cited by 8 publications

References 52 publications

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS)

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS)

Investigating Laser-Induced Periodic Surface Structures (LIPSS) Formation in Silicon and Their Impact on Surface-Enhanced Raman Spectroscopy (SERS) Applications

High sensitive SERS film of Ag-coated aggregated nanowire structure and benzene gas detection

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