Question

Which voltammetric techique can be used to estimate the surface coverage of an absorbed molecule?How?

Answer 1

Solution :

Voltammetric is commonly utilized to estimate the surface coverage of adsorbates and recently has become a rapid qualitative technique to examine electrodes modified with DNA molecules (e.g., gold electrodes covered with thiol-modified oligonucleotides19,23). Cyclic voltammetric, quartz crystal microbalance and atomic force microscopy (AFM) were used to probe the surface coverage and molecular orientation of the immobilized DNA molecule.

The approach is based on anodic oxidative desorption of the molecules which is controlled by synchronized electrochemical gravimetric and voltammetric measurements. Successive anodic scans induce degradation and oxidative desorption of the assembled molecules resulting in a decrease in electrode mass. The completion of desorption is accurately controlled by the charge associated with adsorption of hydroxyl and oxygen species at the bare gold surface. The proposed method can be used to (i) complement the classical approaches or (ii) to estimate the surface coverage for nanostructures whose adsorption requirements, such as long-time assembling, ex-situ chemical treatment and other ex-situ or in-situ multistage procedures, complicate utilization of common approaches.

Thank you

Wish you all the best buddy ?? please upvote it ?