Time-Resolved Study of the Surface-Enhanced Raman Scattering Effect of Silver Nanoparticles Generated in Voltammetry Experiments.

Abstract

UV/Vis absorption and Raman spectroelectrochemistry have been used to study silver nanoparticles (AgNPs) electrodeposition, allowing a better understanding about the metal nanoparticles (NPs) formation process and its influence on the surface-enhanced Raman scattering (SERS) effect. These techniques have provided in-situ information related to the synthesis of AgNPs by cyclic voltammetry. Using a marker, such as cyanide anion (CN -), Raman spectroscopy has allowed us to study all changes that take place on a platinum electrode surface 3 during the AgNPs electrodeposition process. Raman spectra show different SERS behavior depending on the NPs generated. UV/Vis absorption spectroelectrochemistry yields information on the changes in AgNPs plasmon band during their electrodeposition while Raman signal is highly correlated with the kind of NPs generated. The methodology used in this work demonstrates that SERS effect depends strongly on nanoparticle size and shape.

Electrodeposition of silver nanoparticles in the presence of different complexing agents by time‐resolved Raman spectroelectrochemistry

“…Figure S1b displays the experimental Raman spectroelectrochemical setup, in which Confocal Raman Voyage (BWTEK) and AUTOLAB PGSTAT 20 are synchronized by a trigger. Further details about the dynamic spectroelectrochemical Raman system have been previously reported . An XYZ piezoelectric positioner (Newport 271) controlled by a Newport motion controller (Newport, ESP 301) was used to focus the laser beam with micrometric resolution.…”

“…The electrodeposition of AgNPs in the presence of cyanide was previously studied by time‐resolved Raman and UV–vis absorption spectroelectrochemistry . Here, we show similar results in order to understand the relationship between Raman and UV–vis responses and to compare the role of different complexing agents in SERS effect.…”

“…Taking into account that Raman spectroscopy is one of the most powerful techniques in the detection and characterization of a huge variety of systems, the combination of this spectroscopic technique with an electrochemical response provides information of different nature in a unique experiment. Furthermore, ultraviolet–visible (UV–vis) absorption spectroelectrochemistry is one of the few techniques that allows the in situ study of the electrogeneration of metal NPs …”

Spectroelectrochemistry at free-standing carbon nanotubes electrodes

“…There is a substantial literature on metal NPs, specially on their synthesis, which can be accomplished using different methods such as chemical reduction [33], seed-mediated [34], photochemical [35], electrochemical [36], sonochemical [37], lithography [38], galvanic replacement [39], thermal evaporation [40], radiolysis [41], sol-gel [42], laser ablation [43] or CVD [44].…”

Study of Adenine and Guanine Oxidation Mechanism by Surface-Enhanced Raman Spectroelectrochemistry

“…9,10 Although it is quite complicated to obtain substrates with all these properties, metal (Au, Ag, Pd, Pt,…) nanoparticles (NPs) are systems largely employed in SERS. [11][12][13][14][15] In particular, gold deposition by plating processes provides SERS substrates with the long term stability and high enhanced factor. 16,17 Gold nanoparticles (AuNPs) are usually deposited onto different type of electrodes, making possible the study of electrochemical processes because of the higher SERS signal intensity related to the species involved in the electron transfer process.…”