Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering

• Yarong Su,
• Yuanzhen Shi,
• Ping Wang,
• Jinglei Du,
• Markus B. Raschke and
• Lin Pang

Beilstein J. Nanotechnol. 2019, 10, 549–556, doi:10.3762/bjnano.10.56

• wide range of field enhancements, provide a way to determine relative contributions of chemical and electromagnetic field-enhancement in SERS measurements of benzenethiol. We find a chemical enhancement of 2 to 14 for different vibrational resonances when referencing against a vibrational mode that

• intensity dependence of the chemical enhancement and allows for a more systematic design of SERS substrates with desired properties. Keywords: benzenethiol; chemical enhancement; physical enhancement; quantification; surface-enhanced Raman scattering (SERS); Introduction Surface-enhanced Raman scattering

• understanding the possible coupling between these two contributions would be essential to advance SERS into a routine analytical technique. In this work, we demonstrate how SERS measurements of benzenethiol on a wide range of engineered metallic planar and nanostructured substrates, covering a large range of

Refractive index sensing and surface-enhanced Raman spectroscopy using silver–gold layered bimetallic plasmonic crystals

• Somi Kang,
• Sean E. Lehman,
• Matthew V. Schulmerich,
• An-Phong Le,
• Tae-woo Lee,
• Stephen K. Gray,
• Rohit Bhargava and
• Ralph G. Nuzzo

Beilstein J. Nanotechnol. 2017, 8, 2492–2503, doi:10.3762/bjnano.8.249

• benzenethiol (BT) (99.99 %) were purchased from Aldrich. 100% ethyl alcohol (Decon) was used to solvate benzenethiol. Ultrapure water (18.2 MΩ·cm) was generated using a Millipore Milli-Q Academic A-10 system and used to prepare the PEG buffer (0–5.6 wt %) solutions. Plasmonic crystal fabrication via soft

• ) measurements A self-assembled monolayer of benzenethiol on top of the quasi-3D PCs was prepared by immersing them in a 15 mM benzenethiol ethanolic solution for 12 h, rinsing thoroughly with ethanol, and then drying with a stream of nitrogen gas. SERS measurements were made using a SENTERRA dispersive Raman

• ≈2.3 times higher than that of a comparable Au-coated PCs (shown in Figure 4). The major Raman active vibrational modes of benzenethiol are located at 1073 cm−1 and 1574 cm−1 (which correspond to Raman shift peaks relative to the 785 nm laser excitation at 857 nm and 896 nm, respectively) [64]. Past

Localized surface plasmon resonances in nanostructures to enhance nonlinear vibrational spectroscopies: towards an astonishing molecular sensitivity

• Dan Lis and
• Francesca Cecchet

Beilstein J. Nanotechnol. 2014, 5, 2275–2292, doi:10.3762/bjnano.5.237

The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands

• Edwin J. Devid,
• Paulo N. Martinho,
• M. Venkata Kamalakar,
• Úna Prendergast,
• Christian Kübel,
• Tibebe Lemma,
• Jean-François Dayen,
• Tia. E. Keyes,
• Bernard Doudin,
• Mario Ruben and
• Sense Jan van der Molen

Beilstein J. Nanotechnol. 2014, 5, 1664–1674, doi:10.3762/bjnano.5.177

• 1367–1380 cm−1, are no longer evident in the SERS spectrum of the Au-NP–S-BPP arrays. This strongly suggests that the thiol is bound to the gold after surface-mediated hydrolysis of the acetate group. The dominance of key benzenethiol modes in the SERS spectrum is also indicative of binding via thiol

• moiety. The most intense Raman feature in the powder spectrum of S-BPP is the aryl in-plane C–C stretch mode centred at 1591 cm−1. This mode is shifted to 1576 cm−1 in the bound S-BPP molecule of the 2D arrays, which matches precisely the in-plane C–C stretch reported for SERS of benzenethiol on copper

• is characteristic of SAMs of benzenethiol on plasmonic metals, and is further evidence that the S-BPP ligand is binding to the gold surface through this moiety [35][36]. Other characteristic benzenethiol features are also enhanced, at 990, 660 and 406 cm−1. The alkyne C≡C stretch mode, which is by

X-ray spectroscopy characterization of self-assembled monolayers of nitrile-substituted oligo(phenylene ethynylene)s with variable chain length

• Hicham Hamoudi,
• Ping Kao,
• Alexei Nefedov,
• David L. Allara and
• Michael Zharnikov

Beilstein J. Nanotechnol. 2012, 3, 12–24, doi:10.3762/bjnano.3.2

• presented in Figure 1 along with their acronyms; these molecules are nitrile-substituted thiophenol (NC-OPE1), nitrile-substituted tolanethiol (NC-OPE2), and nitrile-substituted 4-[4′-(phenylethynyl)phenylethynyl]benzenethiol (NC-OPE3). As seen in Figure 1, the length of the OPE chain was varied from one to

• in OPE SAMs on Au(111) increases with chain length. The SAM of the simple molecule thiophenol (OPE1) exhibited no periodicity, that of tolanethiol (OPE2) showed a certain (although poor) degree of order, and that of 4-[4′-(phenylethynyl)phenylethynyl]benzenethiol (OPE3) displayed a highly ordered