Surface-enhanced Raman scattering of hydroxybenzoic acids adsorbed on silver nanoparticles

Surface enhanced Raman spectroscopic (SERS) behavior of substituted propenoic acids used in heterogeneous catalytic asymmetric hydrogenation

“…This can be described by a geometry wherein the carboxyl is rotated out from the molecular plane. Furthermore, the strong coordinative binding between the carboxyl group oxygen and the silver surface involves charge transfer (CT) which is part of the surface enhancement mechanism …”

“…In accord with the literature data, no significant wavenumber shift in the SERS spectrum of the AgHBA aq could be observed comparing to the Raman spectrum of HBA solid. This fact indicates the presence of π‐bonding between the benzene ring and the Ag surface.…”

One-pot synthesis, optical property and self-assembly of monodisperse silver nanospheres

“…Among these well-known colloidal nanocrystals, noble-metal nanocrystals may be one of the most important category. To date, these noble-metal nanocrystals have been widely used in the fields of catalysis [5], memory devices [6,7], and surface-enhanced Raman scattering (SERS) [8,9], and also used as building blocks for nanocrystal assemblies [10]. Up to now, a large number of physical and chemical synthetic methods have been explored to effectively control the size and morphology of noble-metal nanocrystals, such as polyol process [11,12], aerosol technique [13], thermolysis of a single-source organometallic precursor [14,15], surfactantpromoted reductive route [16,17], seed-growth method [18] and so on.…”

Surface‐enhanced Raman scattering properties of Lewis acid–base complexes ofp‐hydroxybenzoic andp‐mercaptobenzoic acids with CO2in the presence of silver

“…Adsorption of organic thiols and carboxylic acids on metal colloids is an issue of great interest in surface science, which have been recently investigated by employing surface‐enhanced Raman scattering (SERS) . The high sensitivity of this technique yields a detailed information on the mechanism of the molecular adsorption, allowing, for example, to know which functional groups bind the metal surface .…”

“…The high sensitivity of this technique yields a detailed information on the mechanism of the molecular adsorption, allowing, for example, to know which functional groups bind the metal surface . In this context, p ‐hydroxybenzoic acid (PHBA) and p ‐mercaptobenzoic acid (PMBA) are molecular probes of interest for the detection of surface plasmons, mainly because of their applicability to attain large SERS intensities involving silver and gold nanoparticles. Interestingly, the effect of intermolecular H‐bonding of PMBA in specific solutions has revealed charge‐transfer contributions to SERS.…”