Surface-enhanced spectroscopic investigation of the adsorption properties of hydroxybenzoic acid isomers onto metallic surfaces

Adsorption analysis of nitrophenol isomers on silver nanostructures by surface-enhanced spectroscopy

“…We have previously used scanning electron microscopy and atomic force microscopy to highlight the comparable nature in surface roughness between the silver films and silver powder [14]. Prior work has also compared and contrasted the adsorption of hydroxybenzoic acid isomers [13] and aminobenzoic acid isomers [14] on silver powders.…”

“…4 spare the absence of a small band in the 1700 cm À1 (only seen with n-pentane) that will be addressed shortly. We have previously documented the impact of bond polarity of the deposition solvent in other systems and attribute the differences between adsorption using solvents with polar versus nonpolar bonds to the degree of adsorbate solvation [12,13].…”

“…Silver nanostructures typically yield the best vibrational enhancement in SERS and SEIRA, but gold nanostructures are often used because of silver's strong propensity for oxidation and coagulation while in a nanostructural form [7]. SERS has been shown to be most sensitive to the first adsorbed monolayer while enhancement of both the monolayer and multilayer is frequently observed with SEIRA [11][12][13]. It is now common and convenient to take advantage of SEIRA and SERS approaches to study the adsorbate interactions with metal nanostructures due to the vibrational enhancement inherent to their interaction with many metal nanoparticles.…”

“…More research is being performed where the combination of SERS and SEIRA is used to investigate a given system [11][12][13][14][15][16][17][18][19][20][21][22][23]. Additionally, SEIRA has been used in several circumstances to characterize the adsorption of a complete set of aromatic isomers with two substituents [11,13,14,24,25].…”

“…Additionally, SEIRA has been used in several circumstances to characterize the adsorption of a complete set of aromatic isomers with two substituents [11,13,14,24,25]. One SEIRA study by Merklin and Griffiths involved the NP isomers [25], while Kumar and Carey used resonance Raman to characterize each of the NP isomers [26].…”