Novel electrochemically approach for probing in situ self-assembly by tracking shift of I-E curve of Ohmic circuit

作者：Gao Yi; Nie Fuqiang; Song Junfeng^*

来源：Journal of Electroanalytical Chemistry, 2011, 650(2): 182-186.

DOI：10.1016/j.jelechem.2010.10.010

• L-cysteine
• Gold
• Self-assembly
• Zero current potential
• Ohmic circuit

A novel electrochemically approach for in situ probing the self-assembly is proposed by tracking the shift of the I-E curve of an Ohmic circuit. In the proposed approach, the external electrolysis circuit of three-electrode potentiostat is re-equipped to be an Ohmic circuit by connecting in series a conductive substrate between two clips of working and counter electrodes, and a reference electrode is still connected with the clip of reference electrode. Moreover, the conductive substrate and the reference electrode are immersed in a supporting electrolyte containing adsorbate, a linear sweep potential with respect to the reference electrode is applied to the substrate, at the same time an I-E curve is recorded. With the self-assembly processing, interfacial potential at the substrate/solution interface gradually changes, resulting into the gradual shifts of the recorded I-E curves along potential axis. The shift of the I-E curve is confirmed by employing zero current potential E(zcp) that circuit current I is equal to zero in the I-E curve. Tracking the shift of zero current potential E(zcp) can probe in situ the self-assembly continuously. Herein, the fundamental of the proposed approach is illustrated briefly and the self-assembly of L-cysteine on the gold surface as an example is probed by the proposed approach. The obtained results showed the proposed approach is very simple, rapid and sensitive.

• 出版日期2011-1-1
• 单位西北大学