SPR investigation of mercury reduction and oxidation on thin gold electrodes

The Role of Anion Adsorption in the Effect of Electrode Potential on Surface Plasmon Resonance Response

“…The often used Kretschmann configuration allowed one an especially simple combination of SPR with electroanalytical methods; this is usually referred as an electrochemical SPR. It has found numerous applications in bioanalytics and in surface science . The data interpretation is relatively straightforward if the changes in optical signal are triggered by a single electrochemical process followed by a relatively slow chemical reaction in the solution or by formation/dissolution of some interfacial layers, for example, Hg–Au amalgam .…”

“…It has found numerous applications in bioanalytics and in surface science . The data interpretation is relatively straightforward if the changes in optical signal are triggered by a single electrochemical process followed by a relatively slow chemical reaction in the solution or by formation/dissolution of some interfacial layers, for example, Hg–Au amalgam . However, an effect of the electrode potential on the SPR signal is observed also when no faradaic process takes place .…”

Use of rotating Au-thin film electrode for the differential pulse voltammetric study of Hg2+ complexation

“…It is well established that Hg 2+ undergoes the underpotential deposition (UPD) process on Au electrode. It was extensively studied by either classical electrochemical methods [7,[14][15][16] and surface techniques [17,18]. During UPD process the first few atom-layers of the metal (adatoms) are deposited on the electrode, and sometimes it is accompanied by the adsorption of submonolayer quantities of the metal ion (adions) [7].…”

“…The deposition potential was fixed at 0.2 V, due to the shift of Hg 2+ reduction po- tential to more negative region respect to the formal potential of Hg 2+ /Hg 0 pair [4]. Moreover, the Hg 2+ redox processes studied on thin Au-electrodes by voltammetry and surface plasmon resonance (SPR) [15] demonstrated that on the cathodic scan the current change was detected after +0.25 V. Simultaneously SPR showed the decrease of the resonance angle. Both parameters pointed to the reduction of Hg 2+ at potential of ca.…”

Ultrasensitive detection of mercury (II) ions using electrochemical surface plasmon resonance with magnetohydrodynamic convection

“…Surface plasmon resonance (SPR) [21][22][23][24][25] is a sensitive and powerful optical technique for measuring thickness and structure of ultrathin adsorbate layers and for quantifying the adsorbed concentration of metal films [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Combination of the SPR technique and the electrochemical method has been suggested [7][8][9][10][11][12][13][14], and realized for highly sensitive heavy-metal detection, including mercury [42,43].…”