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- W2489227319 abstract "We have investigated adsorption of different molecules and molecular wire formation on gold nanoparticles by in situ surface plasmon resonance spectroscopy. For this purpose, highly ordered gold nanoparticle arrays on fused silica have been prepared by nanosphere lithography and served as plasmonic substrates. Two arrays with different sized triangular nanoparticles, either with a base of the triangle of (74 § 6) nm or with a base of the triangle of (465 § 28) nm, were used for the sensitivity measurements. After molecular adsorption on the nanoparticles, we observed significantly larger plasmon shifts and an up to 4 times higher sensitivity for the small triangular nanoparticles. This higher sensitivity is attributed to their higher surface to volume ratio compared to the large triangular nanoparticles. After the sensitivity measurements, molecular wire formation has been performed using a ruthenium complex, a double cyclodextrin unit, and an iridium complex. The molecules have been stepwise assembled on highly ordered small triangular gold nanoparticles, which served as anchor points. We observed distinct shifts of the plasmon resonance from 20 nm to 46 nm, depending on the wire length. The results demonstrate that a molecular wire formation can be monitored with high sensitivity and in situ by surface plasmon resonance spectroscopy. Index Terms—Gold nanoparticles, Nanosphere lithography, Plasmon resonance spectroscopy, Triangular nanoparticles" @default.
- W2489227319 created "2016-08-23" @default.
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- W2489227319 date "2011-01-01" @default.
- W2489227319 modified "2023-09-26" @default.
- W2489227319 title "Monitoring of molecule adsorption and molecular wire formation by in situ surface plasmon resonance spectroscopy" @default.
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