Hyper-Rayleigh scattering studies of silver, copper, and platinum nanoparticle suspensions

Abstract

The optical frequency doubling properties of silver, copper, and platinum nanoparticles in aqueous solution are studied via hyper-Rayleigh scattering (HRS) spectroscopy. Substantial HRS responses are observed for silver and copper particles. The response is attributed to enhancement due to resonance of the nonlinearly scattered light with the particles' surface plasmon absorption band. Platinum particles, which lack visible-region plasmon absorption, do not display detectable HRS signals. The largest signals from silver particles are observed under conditions of two-photon resonance, qualitatively consistent with the predictions of available theory; smaller yet still impressive signals are observed under pre-and post-resonant conditions. Ó

Spectroelectrochemical Study of the Photoinduced Catalytic Formation of 4,4′-Dimercaptoazobenzene from 4-Aminobenzenethiol Adsorbed on Nanostructured Copper

“…The potential-dependent behaviour of the SERS spectra observed when exciting with the diode laser at 785 nm could be explained taking into account that at this wavelength the excitation of the surface plasmon of Cu is not as efficient as at 632.8 nm. 61 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Again, four bands at 1135, 1382, 1431 cm -1 and 1574 cm -1 are also observed as an evidence of the 4,4'-DMAB formation under the influence of the radiation at a wavelength as high as 1064 nm. Again, it is necessary to point out that these bands were not observed at this wavelength by Dendisova-Vyskovska et al 35 using a colloidal Cu nanoparticle system.…”

Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

“…After being reacted with HAuCl 4 solution, a small red shift for the absorption peaks could be observed. As illustrated, the absorption peak was 506 nm for 0-D nanostructures, while that for 1-D nanostructures was 455 nm, and both the wavelengths were lower than Au NPs in the literature [34,35] . The fact that the optical absorption spectrum shows only one plasmon band reveals that the surface of the 0-D and 1-D Au-Ag nanostructures was alloy rather than individual Au and Ag.…”

Plasmonic enhancement of second harmonic generation on metal coated nanoparticles

“…First experimental and theoretical studies were performed on plane surfaces [22][23][24][25][26][27]. Recently studies on SHG or Hyper Rayleigh [28] scattering were performed on colloidal metallic nanoparticles [29][30][31][32][33][34][35][36] as well as on particles embedded in a matrix [37,38] and more complex plasmonic structures [39][40][41][42].…”