Potential-dependent adsorption of uracil on a silver electrode in alkaline solutions

Double fingerprint characterization of uracil and 5-fluorouracil

“…Another difference that we can observed between our EC-SERS spectra and those reported in bibliography is a noticeable redshifting of the ring breathing band, which appears at 768 cm −1 for U molecule in our experiment but has been usually reported around 800 cm −1 [46][47][48] . The shifting of this band has been usually related to the presence of various tautomeric forms of U, product of the deprotonation of N 1 or N 3 ( Fig.…”

“…4 A, orange line) is characterized by two strong bands at 464 and 511 cm −1 . The assignation of these bands is not easy, to the best of our knowledge, these two bands have not been reported over silver substrates previously, at least no with the high intensity observed in our experiments [46][47][48] .…”

“…Our work, however, is developed in acidic media (pH = 1, 0.1 M HClO 4 ), where U molecule is presented in protonated form, affecting to the interaction between the molecule and the surface. The dynamic generation of EC-SERS substrate is another crucial factor that can differentiate our spectra, since it has been observed that potential can play a huge role in U angle of adsorption on silver surfaces [47] .…”

Fabrication of a highly sensitive surface-enhanced Raman scattering substrate for monitoring the catalytic degradation of organic pollutants

“…[15][16][17] Recently, semiconductors, quantum dots (QDs), and graphene have also been found to act as Raman signal-enhancing agents. [18][19][20][21][22][23][24][25][26][27][28][29] Among them, semiconductors have advantages such as adjustable band gaps, stable exciton production, control of stoichiometry, and long-term stability, making them good candidates for SERS substrates. There are two traditional enhancement mechanisms to describe the SERS effect on a metallic substrate: electromagnetic (EM) and chemical enhancement.…”

Cyanide-Free Silver Electrochemical Deposition on Copper and Nickel

“…[23][24][25] Besides uracil adsorbs on metal copper and silver surfaces. [26][27][28][29] Xie et al achieved good adherent silver deposits on copper from uracil-based baths without separate silver strike. 30 The deposit made in an additivefree 0.15 M Ag + and 0.9 M uracil solution is gray.…”