Size dependence of the surface plasmon enhanced second harmonic response of gold colloids: towards a new calibration method

1999 ◽  
pp. 581-582 ◽  
Author(s):  
Paolo Galletto ◽  
Pierre F. Brevet ◽  
Hubert H. Girault ◽  
Rodolphe Antoine ◽  
Michel Broyer
Keyword(s):  
Surface Plasmon ◽  
Size Dependence ◽  
Second Harmonic ◽  
Calibration Method ◽  
Gold Colloids ◽  
Harmonic Response

Surface plasmon enhanced second harmonic response from gold clusters embedded in an alumina matrix

1998 ◽  
Vol 84 (8) ◽  
pp. 4532-4536 ◽  
Author(s):  
R. Antoine ◽  
M. Pellarin ◽  
B. Palpant ◽  
M. Broyer ◽  
B. Prével ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Second Harmonic ◽  
Gold Clusters ◽  
Alumina Matrix ◽  
Harmonic Response

Enhancement of the Second Harmonic Response by Adsorbates on Gold Colloids: The Effect of Aggregation

1999 ◽  
Vol 103 (41) ◽  
pp. 8706-8710 ◽  
Author(s):  
P. Galletto ◽  
P. F. Brevet ◽  
H. H. Girault ◽  
R. Antoine ◽  
M. Broyer
Keyword(s):  
Second Harmonic ◽  
Gold Colloids ◽  
Harmonic Response

Large second‐harmonic response of C60thin films

1992 ◽  
Vol 60 (7) ◽  
pp. 810-812 ◽  
Author(s):  
X. K. Wang ◽  
T. G. Zhang ◽  
W. P. Lin ◽  
Sheng Zhong Liu ◽  
G. K. Wong ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Harmonic Response

scholarly journals Examination of Adsorption Orientation of Amyloidogenic Peptides Over Nano-Gold Colloidal Particle Surfaces

2019 ◽  
Vol 20 (21) ◽  
pp. 5354 ◽  
Author(s):  
Kazushige Yokoyama ◽  
Kieran Brown ◽  
Peter Shevlin ◽  
Jack Jenkins ◽  
Elizabeth D’Ambrosio ◽  
...  
Keyword(s):  
Charge Distribution ◽  
Size Dependence ◽  
Partial Charge ◽  
Gold Colloid ◽  
Gold Colloids ◽  
Nano Gold ◽  
Secondary Layer ◽  
Amyloidogenic Peptides ◽  
The Difference ◽  
Nano Size

The adsorption of amyloidogenic peptides, amyloid beta 1–40 (Aβ1–40), alpha-synuclein (α-syn), and beta 2 microglobulin (β2m), was attempted over the surface of nano-gold colloidal particles, ranging from d = 10 to 100 nm in diameter (d). The spectroscopic inspection between pH 2 and pH 12 successfully extracted the critical pH point (pHo) at which the color change of the amyloidogenic peptide-coated nano-gold colloids occurred due to aggregation of the nano-gold colloids. The change in surface property caused by the degree of peptide coverage was hypothesized to reflect the ΔpHo, which is the difference in pHo between bare gold colloids and peptide coated gold colloids. The coverage ratio (Θ) for all amyloidogenic peptides over gold colloid of different sizes was extracted by assuming Θ = 0 at ΔpHo = 0. Remarkably, Θ was found to have a nano-gold colloidal size dependence, however, this nano-size dependence was not simply correlated with d. The geometric analysis and simulation of reproducing Θ was conducted by assuming a prolate shape of all amyloidogenic peptides. The simulation concluded that a spiking-out orientation of a prolate was required in order to reproduce the extracted Θ. The involvement of a secondary layer was suggested; this secondary layer was considered to be due to the networking of the peptides. An extracted average distance of networking between adjacent gold colloids supports the binding of peptides as if they are “entangled” and enclosed in an interfacial distance that was found to be approximately 2 nm. The complex nano-size dependence of Θ was explained by available spacing between adjacent prolates. When the secondary layer was formed, Aβ1–40 and α-syn possessed a higher affinity to a partially negative nano-gold colloidal surface. However, β2m peptides tend to interact with each other. This difference was explained by the difference in partial charge distribution over a monomer. Both Aβ1–40 and α-syn are considered to have a partial charge (especially δ+) distribution centering around the prolate axis. The β2m, however, possesses a distorted charge distribution. For a lower Θ (i.e., Θ <0.5), a prolate was assumed to conduct a gyration motion, maintaining the spiking-out orientation to fill in the unoccupied space with a tilting angle ranging between 5° and 58° depending on the nano-scale and peptide coated to the gold colloid.

Observation of the Potential-Dependent Second Harmonic Response from the Si(111)/Electrolyte and Si(111)/SiO2/Electrolyte Interfacial Regions

1995 ◽  
Vol 99 (10) ◽  
pp. 3240-3250 ◽  
Author(s):  
John L. Daschbach ◽  
P. R. Fischer ◽  
D. E. Gragson ◽  
G. L. Richmond
Keyword(s):  
Second Harmonic ◽  
Harmonic Response
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