SERS and Molecular Orientation in Langmuir−Blodgett Films Deposited onto Smooth Copper Surfaces

Muniz‐Miranda, Maurizio; Puggelli, M.; Ricceri, Riccardo; Gabrielli, G.

doi:10.1021/la960098o

Cited by 17 publications

(15 citation statements)

References 14 publications

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“…The orientation of small molecular targets through SERS has already been recovered in previous studies. 19,[26][27][28][29][30][31][32] However, using SERS to determine the molecular orientation of large molecules such as conjugated polymers is still a real challenge as for large molecules the molecular sizes are typically larger than the enhancement volume. Additionally molecular diffusion leads to changes in molecular conformations and orientations within the enhancement volume resulting in selective Raman enhancement over time.…”

Section: Introductionmentioning

confidence: 99%

Probing the Molecular Orientation of a Single Conjugated Polymer via Nanogap SERS

Marshall¹,

Roberts²,

Gierschner

et al. 2019

ACS Appl. Polym. Mater.

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Determining the molecular orientation at the single molecule level is of key importance for a wide range of applications ranging from molecular electronic devices to biomedical applications. In this work Surface-Enhanced Raman Scattering (SERS) was used to probe the light emitting conjugated polymer F8-PFB at the single molecule level using nanoparticle on an extended metallic film nano-gap. The directional field enhancement of the nano-gap combined with Density Functional Theory (DFT) calculations was used to determine the orientation of the molecule. This analysis revealed that the spin-coated conjugated polymer preferentially aligns its molecular chains parallel to the metallic substrate. The integration of this approach in nanofabrication and synthesis will have a profound impact on different fields ranging from molecular electronic devices to biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Probing the Molecular Orientation of a Single Conjugated Polymer via Nanogap SERS

Marshall¹,

Roberts²,

Gierschner

et al. 2019

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…Since the accidental discovery of surface enhanced Raman scattering (SERS), it has been a fascinating field of study, engrossing the enriched minds of physicists, chemists, biologists, and materials scientists. In the course of scientific evolution, SERS has undergone discrete stages of development right from understanding the basic physics behind the phenomenon, perceiving the probe substrate interactionsand their adsorption efficiencies to the real state‐of‐art diagnostic applications . The remarkable facet of SERS technique is its high specificity, providing unique “fingerprints” of molecules under study at trace concentrations.…”

Section: Introductionmentioning

confidence: 99%

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Saha

Ghosh

Chowdhury

2018

J Raman Spectroscopy

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A facile procedure towards the fabrication of highly reproducible, large area surface-enhanced Raman scattering (SERS) active substrates through integration of Langmuir-Blodgett and self-assembly technique has been reported. The plasmonic architectures of the substrates can be tuned at will to control the hot spots and hence the overall enhancements of SERS signal. The asprepared substrates of classes "A" and "B" incubated in gold nanocolloids show their respective efficacies as efficient SERS sensing scaffolds for detecting 4-MPy molecule at ultrasensitive concentrations. Moreover, these substrates are unique in their kinds, where explicit or concomitant presence of protonated and deprotonated forms of 4-MPy can be detected at trace concentrations. The substrates also exhibit remarkable spectral reproducibility and show early promise to overcome the "SERS uncertainty principle". To our knowledge, this genre of SERS active substrates with facile control over plasmonics, is the first report of its kind and are expected to provide new direction towards successful fabrication of the next generation SERS sensing platforms.

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“…7,8 They are largely defined by the increased sensitivity that they demonstrate over their relatively weak non-enhanced counterparts, Raman scattering (RS) 9 and resonance Raman scattering (RRS), 10 respectively. This increased sensitivity results from the surface enhancement that occurs when molecules are excited with light while at or near the surface of appropriate enhancing metal nanoparticles, owing to dramatically strengthened electromagnetic fields resulting from dipole particle plasmon resonances of the metal.…”

Section: Introductionmentioning

confidence: 99%

Mapping single‐molecule SERRS from Langmuir–Blodgett monolayers on nanostructured silver island films

Goulet

Pieczonka

Aroca

2005

J Raman Spectroscopy

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To explore the breakdown of ensemble averaging as the single molecule regime is approached, spatial mapping of surface-enhanced resonance Raman scattering (SERRS) intensities was employed in the study of mixed dye-fatty acid Langmuir-Blodgett (LB) monolayers deposited on nanostructured Ag island films. By variation of the ratio of the two components in the films, the effects of dye concentration, on both SERRS spectra and LB monolayer architecture, were explored down to the single-molecule level. Insight was gained into the nature of areas of intense local electromagnetic field strength (i.e. 'hot spots') that provide enormous enhancement of Raman signals, and their wavenumber of occurrence on nanostructured Ag island films. These enhancing films were further characterized by UV-visible surface plasmon absorbance and atomic force microscopy. The target analyte employed in this work, n-pentyl- 5-salicylimidoperylene, was dispersed in monolayers of arachidic acid on Ag nanostructured films for single point and 2D mapping SERRS experiments. The optical characterization of this dye was completed with solution-phase molecular absorption and fluorescence, in addition to monolayer resonance Raman scattering (RRS).Single-molecule SERRS mapping results suggest that electromagnetic hot spots on Ag island films are in fact highly localized on the nanoscale, corresponding to relatively few molecular sites, and hence also stress the rarity of coincidence between hot spots and single isolated molecules as a key consideration in ultrasensitive SERRS measurements of this type.

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SERS and Molecular Orientation in Langmuir−Blodgett Films Deposited onto Smooth Copper Surfaces

Cited by 17 publications

References 14 publications

Probing the Molecular Orientation of a Single Conjugated Polymer via Nanogap SERS

Probing the Molecular Orientation of a Single Conjugated Polymer via Nanogap SERS

Infused self‐assembly on Langmuir–Blodgett Film: Fabrication of highly efficient SERS active substrates with controlled plasmonic aggregates

Mapping single‐molecule SERRS from Langmuir–Blodgett monolayers on nanostructured silver island films

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