Electro - total internal reflection ellipsometry has been reported as a phase sensitive ellipsometry technique to observe the redox reactions on the surface of the electrode. In this work, with the imaging ellipsometry, we have used Electro-total internal reflection imaging ellipsometry (Electro-TIRIE) to measure the dissolved oxygen concentration on the surface tethered weak polyelectrolyte brush, carboxylated poly(oligo(ethylene glycol) methacrylate-random-2-hydroxyethylmethacrylate), modified electrode. The cyclic voltammetry has shown despite the covering of the weak polyelectrolyte brush, the electrode could still reduce the dissolved oxygen and Electro-TIRIE technique could unveil the different swelling behavior of the brushes during the reduction. The difference may be attributed to the electro-active probe permeability of the brushes. With the imaging ellipsometry, we proposed a parallel dissolved oxygen measurement. Compared with our previous results, the optical signal noise ratio has been enhanced 10 times and the measurement time has reduced from 30 minutes to 10 minutes. 

http://dx.doi.org/10.1149/2.0331605jes

The authors acknowledge the financial support to the National Natural Science Foundation of China (21305147, 11274345), to the International Science & Technology Cooperation Program of China (2015DFG32390), FCT project-UID/MULTI/00612/2013 to the National Basic Research Program of China (2009CB320302), to the National High Technology Research Development Program of China (2008AA02Z419), and to the Instrument Developing Project of the Chinese Academy of Sciences (KJCX2-YW-M04, KJCX2-YW-M03).

Liu W,Li M,Lv B,et al. An Imaging Ellipsometry Approach to Dissolved Oxygen Measurement on Surface Tethered Weak Polyelectrolyte Modified Electrode[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2016,163(5):H286-H291.