TY - JOUR
T1 - Effect of Underpotentially Deposited Lead on the SERS of Chloride, Bromide, and Thiocyanate Adsorbed at Silver Electrodes
T2 - Evidence for Chemical Contributions to SERS
AU - Pemberton, Jeanne E.
AU - Coria-garcia, José C.
AU - Hoff, Rebecca L.
PY - 1987/3/1
Y1 - 1987/3/1
N2 - A study of the effect of underpotentially deposited Pb on the SERS of Cl-, Br-, and SCN-adsorbed at Ag electrodes is presented in this report. The quenching behavior of the SERS of these adsorbates by the deposited Pb is different for each adsorbate. The SERS of SCN-is quenched rapidly by very small amounts of underpotentially deposited Pb, while the quenching for Br- and Cl- is less drastic. These results are interpreted in terms of a charge-transfer model for SERS that is sensitive to the changes in work function at microscopic sites upon Pb deposition. The charge-transfer process is envisioned to occur at sites of atomic scale roughness as has been previously postulated. Evidence for the importance of atomic scale roughness in these studies comes from the lack of reversibility of the SERS intensities after the deposition and quantitative stripping of greater than 60-70% of a Pb monolayer on the Ag surface. in total, these results suggest that chemical contributions to SERS are significant.
AB - A study of the effect of underpotentially deposited Pb on the SERS of Cl-, Br-, and SCN-adsorbed at Ag electrodes is presented in this report. The quenching behavior of the SERS of these adsorbates by the deposited Pb is different for each adsorbate. The SERS of SCN-is quenched rapidly by very small amounts of underpotentially deposited Pb, while the quenching for Br- and Cl- is less drastic. These results are interpreted in terms of a charge-transfer model for SERS that is sensitive to the changes in work function at microscopic sites upon Pb deposition. The charge-transfer process is envisioned to occur at sites of atomic scale roughness as has been previously postulated. Evidence for the importance of atomic scale roughness in these studies comes from the lack of reversibility of the SERS intensities after the deposition and quantitative stripping of greater than 60-70% of a Pb monolayer on the Ag surface. in total, these results suggest that chemical contributions to SERS are significant.
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U2 - 10.1021/la00074a002
DO - 10.1021/la00074a002
M3 - Article
AN - SCOPUS:0023311612
SN - 0743-7463
VL - 3
SP - 150
EP - 159
JO - Langmuir
JF - Langmuir
IS - 2
ER -