TY - JOUR
T1 - Probing photoinduced electron transfer reactions by in situ electrochemical contact angle measurements
AU - Wang, Xuemei
AU - Zeevi, Shiri
AU - Kharitonov, Andrei B.
AU - Katz, Eugenii
AU - Willner, Itamar
PY - 2003/10/1
Y1 - 2003/10/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0142156531&partnerID=8YFLogxK
U2 - 10.1039/b306661d
DO - 10.1039/b306661d
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AN - SCOPUS:0142156531
SN - 1463-9076
VL - 5
SP - 4236
EP - 4241
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 19
ER -