Electrochemical Charge Injection into Immobilized Nanosized Gold Particle Ensembles:  Potential Modulated Transmission and Reflectance Spectroscopy

Abstract

Self-assembled multilayer thin films of nanometer-sized gold particles linked with organic dithiols have been prepared on glass, indium tin oxide, and gold substrates. The gold particles within these structures retain their integrity and no sintering occurs as demonstrated by their optical absorbance, ellipsometry, and potential modulated transmission and reflectance spectroscopy. The optical response to electrochemical charge injection into the outermost layer of gold particles is completely different from that of bulk gold electrodes, and it is concluded that the particles have to be regarded as discrete, immobilized quantum-dots.

Short-time preparation and electrochemical properties of a single layer of tetraoctylammonium bromide capped Au nanoparticles on dithiol self-assembled monolayer-modified Au electrode

“…It should be emphasized that in the present study, we measured the ER signal for a single layer of AuNPs on Au/BDMT and Au/HDT electrodes. Although a red-shifted plasmon resonance band was observed also in the reported paper [21] as we observed in the present study, the band is negative going in the reported paper. We reported similar positive going band as we observed in Fig.…”

“…Here it is worthwhile to compare the ER bands observed in the present study with the reported ER band for the 2 layers of TOAB-AuNPs on 1,4-benzenedimethanethiol coated Au electrode [21]. It should be emphasized that in the present study, we measured the ER signal for a single layer of AuNPs on Au/BDMT and Au/HDT electrodes.…”

“…6 for the C-AuNPs immobilized on 1-mercapto-11-aminoundecane coated Au electrode [11]. The origin of the difference between the reported negative going ER signal [21] and the observed positive going ER signals in Fig. 6 is possibly due to the difference in the definition of the sign of the ER signal.…”

Electrochemical Quantized Capacitance Charging of Surface Ensembles of Gold Nanoparticles

“…For example, Schiffrin et al 12 have recently described the binding of "naked" Au clusters to a thiolated indium thin oxide electrode surface.…”

Layer-by-layer fabrication of well-packed gold nanoparticle assemblies guided by a β-sheet peptide network

“…The LbL assembly takes advantage of the same attractive forces that form complexes but in a controlled manner that produces thin, conformal films that can coat a variety of surfaces and thus are a powerful method for fabricating multilayer gold nanoparticle films. [15][16][17][18][19][20][21][22][23][24][25][26][27] In spite of these many reports, to the best of our knowledge, well-controlled gold nanoparticle assemblies guided with a polypeptide network have not yet been reported. The aim of this article is to construct homogeneously well-ordered gold nanoparticle multilayers assisted with a b-sheet peptide template.…”