TY - JOUR
T1 - UV-visible transmission-absorption spectral study of Au nanoparticles on a modified ITO electrode at constant potentials and under potential modulation
AU - Toyota, Ayumi
AU - Nakashima, Naotoshi
AU - Sagara, Takamasa
N1 - Funding Information:
This work was conducted as the part of the research project of “Organization and Function”, PRESTO, JST (Japan), of T.S. This work was supported in part by a Grant-in-Aid for Scientific Research on Priority Areas (Area No. 417 for T.S.) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. A.T. is grateful for scholarship support from The Circle for the Promotion of Science and Engineering. We thank Dr. Koumei Baba at Industrial Technology Center of Nagasaki for his kind measurement of the SEM images.
PY - 2004/4/15
Y1 - 2004/4/15
N2 - Gold nanoparticles of a diameter of 11 nm were immobilized on a monolayer of amine-terminated siloxane coated on an ITO electrode. The potential dependent behavior of the particles was characterized by combined use of electrochemical and UV-Vis transmission-absorption spectroelectrochemical methods from not only the static but also the dynamic viewpoint. The gold nanoparticles showed a potential dependent shift of the plasmon absorption band due to charging-discharging of the particles; at more negative potentials, a sharper and greater absorption peak was observed at a shorter wavelength. This spectral change was also tracked by potential-modulated UV-Vis transmission-absorption (PMTA) spectroscopy. Analysis by the concerted use of PMTA signals and ac impedance revealed that the PMTA signal synchronizes with the change of the amount of charge on the particles. The potential step coulometry measurement enabled us to estimate the transferred amount of charge as being approximately 1500 electrons V-1 per particle, which is in good agreement with the spectral shift.
AB - Gold nanoparticles of a diameter of 11 nm were immobilized on a monolayer of amine-terminated siloxane coated on an ITO electrode. The potential dependent behavior of the particles was characterized by combined use of electrochemical and UV-Vis transmission-absorption spectroelectrochemical methods from not only the static but also the dynamic viewpoint. The gold nanoparticles showed a potential dependent shift of the plasmon absorption band due to charging-discharging of the particles; at more negative potentials, a sharper and greater absorption peak was observed at a shorter wavelength. This spectral change was also tracked by potential-modulated UV-Vis transmission-absorption (PMTA) spectroscopy. Analysis by the concerted use of PMTA signals and ac impedance revealed that the PMTA signal synchronizes with the change of the amount of charge on the particles. The potential step coulometry measurement enabled us to estimate the transferred amount of charge as being approximately 1500 electrons V-1 per particle, which is in good agreement with the spectral shift.
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U2 - 10.1016/j.jelechem.2003.10.036
DO - 10.1016/j.jelechem.2003.10.036
M3 - Article
AN - SCOPUS:1842564151
SN - 1572-6657
VL - 565
SP - 335
EP - 342
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -