Particle size dependence of the charging of Au nanoparticles immobilized on a modified ITO electrode

被引:35
作者
Toyota, Ayumi [1 ]
Sagara, Takamasa [1 ]
机构
[1] Nagasaki Univ, Grad Sch Sci & Technol, Dept Mat Sci, Nagasaki 8528521, Japan
关键词
Au nanoparticle; ITO electrode; plasmon absorption; transmission spectroscopy; potential step coulometry;
D O I
10.1016/j.electacta.2007.10.024
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Citrate-stabilized gold nanoparticles (Au-NPs) of a nearly spherical shape with four different diameters (3.7, 11.0, 21.7, and 40.8nm) were immobilized on a 4-aminobutylsiloxane monolayer-modified indium-tin oxide (ITO) electrode. From the results of coulometric measurements using potential step sequences, the number of electrons per particle to be transferred to attain a new equilibrium state after applying a potential step was found to increase in proportion to the square of the diameter. The double layer integral capacitance of the Au-NP surface per unit area in the potential range from -0.4 to 0.6V (Ag/AgCl/satd KCl) is ca. 70 mu F cm(-2), being independent of the particle size. The differential capacitance of the Au-NP surface is a function of the potential with a maximum at 0.32 V, while the function is again independent of the particle size. The kinetics of the charging was discussed using the analysis of the potential step transient current. The potential-dependent shift of the plasmon absorption band obtained by constant-potential and potential-modulated transmission-absorption spectroscopic measurements revealed that a smaller AU-NP exhibits a greater blue-shift of the plasmon band when applying more negative potentials, being in line with the Mie-Drude theory. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2553 / 2559
页数:7
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