UV–visible transmission–absorption spectral study of Au nanoparticles on a modified ITO electrode at constant potentials and under potential modulation

Time dependent spectral change upon potential step perturbation for Au nanoparticles immobilized on an organic monolayer-modified ITO electrode

“…8, line b to c). The spectral feature is in line with the Mie-Drude model as discussed in our previous report [10]. Note that the enhancement was of relatively greater extent than in the absence of Cl -(see Fig.…”

“…That is, at more negative potentials, a sharper and greater absorption peak was observed at a shorter wavelength. This spectral change was interpreted as being due to potential-dependent charging-discharging of the particle in our previous paper [10]. The transients of the absorbance in response to single potential step perturbations were monitored between the two potentials cited in Fig.…”

“…Especially, potential dependent particle charge, aggregation state, and microenvironment can be highlighted. In our previous report, the potential dependence of plasmon absorption band was described using the results of the measurements of sine-wave potential-modulated UV-vis transmission-absorption (PMTA) signal for Au nanoparticles on a modified ITO electrode in 0.1 M phosphate buffer solution at pH 7.0 [10]. The observed spectral change was mainly due to the charging-discharging process of the particles.…”

Shifts in plasmon resonance due to charging of a nanodisk array in argon plasma

“…LSPRs of metal nanostructures depend on properties such as the size, 10,11 shape, [12][13][14] metal material, 15 surrounding dielectric material, [16][17][18][19][20][21][22] and the charge of the metal. [23][24][25][26][27][28][29][30] Active plasmonic devices can be realized by externally tuning the LSPR of nanostructures. Previously, chemical/electrochemical charging was used to actively tune the LSPR of arrays of both silver 24,25,30 and gold 23,26,27,29 nanostructures; however, this process is relatively slow.…”

“…[23][24][25][26][27][28][29][30] Active plasmonic devices can be realized by externally tuning the LSPR of nanostructures. Previously, chemical/electrochemical charging was used to actively tune the LSPR of arrays of both silver 24,25,30 and gold 23,26,27,29 nanostructures; however, this process is relatively slow. In this study, a rapid shift in the LSPR of an array of gold nanodisks was induced by surrounding the particles with a low-temperature argon plasma.…”