A correlation study between the conformation of the 1,4-dithiane SAM on gold and its performance to assess the heterogeneous electron-transfer reactions

The influence of 4-mercaptopyridine layer instability on rapid electron transfer reaction

“…Table 1 shows that the value of H decreases with the immersion time, suggesting that the adsorption of the pyS on gold leads to a partially blocked surface implying that pyS is not a continuous film and that the gold surface is not uniformly accessible. This analysis is in close agreement with previous reports in the literature about the adsorption of the 1,4-dithiane on gold surface studied by hydrodynamic impedance technique [20].…”

“…Previous cyclic voltammetric results [20] showed that the presence of the 1,4-dithiane species on the Au surface strongly inhibited the Fe 2+ /Fe 3+ reaction with respect to that on the bare gold electrode after a long modification time (t > 15 h). These previous results are evidences that electron transfer reaction for the probe molecule occurs within the layer defects and at the uncovered electrode surface.…”

Detection of Persistent Organic Pollutants by Using SERS Sensors Based on Organically Functionalized Ag Nanoparticles

“…The LOD ranges from 10 −8 M in the case of PYR and TP to 10 −10 M for COR. These LODs are similar to those reported by employing chromatographic and fluorimetric methods [39][40][41][42], with the additional advantage that no pre-concentration step was necessary. COR represents a special case.…”

Sensitivity Improvement of an Impedimetric Immunosensor Using Functionalized Iron Oxide Nanoparticles

“…The membrane resistance values, R m , were extracted from fitted data (Table 3) which are 8292 and 37120 Ωcm 2 for bare Au-electrode and mixed modified Auelectrode, respectively. The values of the fractional coverage area of the SAM monolayer (θ) can be calculated from the impedance diagrams using [36] …”