Probing photoinduced electron transfer reactions by in situ electrochemical contact angle measurements

Xuemei Wang, Shiri Zeevi, Andrei B. Kharitonov, Eugenii Katz, Itamar Willner

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In situ electrochemical static contact angle measurements are employed to probe photoinduced electron transfer processes at electrode surfaces. Photosystems consisting of tris(2,2′-bipyridyl)ruthenium(II), (Ru(bpy)32+), N,N′-dimethyl-4,4′-bipyridinium (MV2+), Na2EDTA or CdS nanoparticles, MV2+, triethanolamine (TEOA) were included in aqueous droplets that were coupled with a ferrocene monolayer-functionalized electrode. Upon the oxidation of the interface (0.5 V vs. Ag quasi-reference electrode), and the illumination of the systems, photoinduced electron transfer to the modified electrode proceeds. The electron transfer processes yield photocurrents, and the photoelectrochemical transformations are followed by contact angle measurements. Similarly, a CdS/bipyridinium monolayer is assembled on an Au electrode support. The redox transformations of the bipyridinium units control the hydrophilic/hydrophobic properties of the interface, and are followed by contact angle analyses. Irradiation of the CdS/bipyridinium layer associated with the electrode biased at -0.3 V yields a photocurrent. The changes in the wetting properties of the irradiated interface are investigated by contact angle measurements.

Original languageEnglish
Pages (from-to)4236-4241
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume5
Issue number19
DOIs
StatePublished - 1 Oct 2003

Fingerprint

Dive into the research topics of 'Probing photoinduced electron transfer reactions by in situ electrochemical contact angle measurements'. Together they form a unique fingerprint.

Cite this