“…Wavelength of maximum absorption intensity (λ max ) values obtained from such spectra are reported in Table . These λ max values are in good agreement with the reported plasmon resonance bands for both Au ,,, and Ag ,,,,, sols in organic solvents. 2 Visible spectra of 40-nm diameter () and 90 - nm diameter (- - -) Au (A) and Ag (B) nanorod sols in CHCl 3 (without additional polymeric stabilizers).…”
Section: Resultssupporting
confidence: 89%
“…Aqueous colloidal dispersions of noble-metal nanoparticles have been known for over 200 years. However, only recently have there been reports on the synthesis of noble-metal colloids in organic solvents. − Spherical metal nanoparticles were prepared in this prior work. Rodlike colloids have been previously prepared for inorganic oxides such as imogolite (aluminosilicate), boehmite (AlOOH), and V 2 O 5 .…”
Gold and silver nanorods of diameter 40 and 90 nm and having a variety of aspect ratios (length/diameter)
were prepared using the template synthesis approach. After template synthesis, the nanorods were freed
from the template membrane and dispersed in either hexafluoro-2-propanol (HFIP) or CHCl3. The stability
of these nanorod sols was monitored using visible absorption spectroscopy. For both the Au and Ag nanorods
(in both solvents), sols prepared from the 90-nm diameter nanorods were found to be less stable than sols
prepared from the 40-nm diameter nanorods. The addition of the polymeric stabilizers poly(vinylpyridine)
or poly(vinylpyrrolidone) did not enhance the stability of these nanorod sols. In addition to these studies of
sol stability, UV−vis absorption spectroscopy was used to investigate the plasmon absorption band of these
sols. The wavelength of maximum absorbance of the plasmon resonance band (λmax) for both Ag and Au
sols was shifted to higher wavelengths when the nanorod diameter was increased from 40 to 90 nm. In
addition, the λmax values for sols prepared in CHCl3 were red-shifted relative to analogous sols prepared in
HFIP.
“…Wavelength of maximum absorption intensity (λ max ) values obtained from such spectra are reported in Table . These λ max values are in good agreement with the reported plasmon resonance bands for both Au ,,, and Ag ,,,,, sols in organic solvents. 2 Visible spectra of 40-nm diameter () and 90 - nm diameter (- - -) Au (A) and Ag (B) nanorod sols in CHCl 3 (without additional polymeric stabilizers).…”
Section: Resultssupporting
confidence: 89%
“…Aqueous colloidal dispersions of noble-metal nanoparticles have been known for over 200 years. However, only recently have there been reports on the synthesis of noble-metal colloids in organic solvents. − Spherical metal nanoparticles were prepared in this prior work. Rodlike colloids have been previously prepared for inorganic oxides such as imogolite (aluminosilicate), boehmite (AlOOH), and V 2 O 5 .…”
Gold and silver nanorods of diameter 40 and 90 nm and having a variety of aspect ratios (length/diameter)
were prepared using the template synthesis approach. After template synthesis, the nanorods were freed
from the template membrane and dispersed in either hexafluoro-2-propanol (HFIP) or CHCl3. The stability
of these nanorod sols was monitored using visible absorption spectroscopy. For both the Au and Ag nanorods
(in both solvents), sols prepared from the 90-nm diameter nanorods were found to be less stable than sols
prepared from the 40-nm diameter nanorods. The addition of the polymeric stabilizers poly(vinylpyridine)
or poly(vinylpyrrolidone) did not enhance the stability of these nanorod sols. In addition to these studies of
sol stability, UV−vis absorption spectroscopy was used to investigate the plasmon absorption band of these
sols. The wavelength of maximum absorbance of the plasmon resonance band (λmax) for both Ag and Au
sols was shifted to higher wavelengths when the nanorod diameter was increased from 40 to 90 nm. In
addition, the λmax values for sols prepared in CHCl3 were red-shifted relative to analogous sols prepared in
HFIP.
“…All three peaks can therefore serve as indicators for the presence of silver nanoparticles in the polymer. The 668‐cm −1 band has been observed in silver colloids stabilized by PVP and in silver–polymer‐coated paper 36, 37. The weakening of the 3330‐cm −1 band and perhaps the disappearance of the 1640 band (if not disappearing, then at least weakening) can be explained as being due to the silver bonding to the polymer surface via the amide group.…”
Section: Resultsmentioning
confidence: 99%
“…Raman spectroscopy has been applied to the characterization of polyamide bonds and to provide knowledge about the structure, bonding nature, and changes upon their reaction 35. At the same time, Raman spectroscopy is widely used for investigating silver nanocrystalline systems 36–38. The Raman spectra of the original nylon chips before and after a sonochemical treatment (without silver) are presented in Figure 8(I).…”
A silver/nylon 6,6 nanocomposite containing 1 wt % metallic silver has been produced from an aqueous solution of silver nitrate in the presence of ammonia and ethylene glycol by an ultrasound-assisted reduction method. The structure and properties of nylon 6,6 coated with silver have been characterized with X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray, X-ray photoelectron spectroscopy, Raman spectroscopy, and diffused reflection spectroscopy measurements. The nanocrystals of pure silver, 50-100 nm in size, are finely dispersed on the polymer surface without damaging the nylon 6,6 structure. This silver-nylon nanocomposite is stable to many washing cycles and thus can be used as a master batch for the production of nylon yarn by melting and spinning processes. The fabric knitted from this yarn has shown excellent antimicrobial properties.
“…Thin films of metal nanoparticles have been receiving increasing attention because of the optical, electronic, and catalytic properties of such materials [1][2][3][4][5]. These materials are important due to their unusual size-dependent properties and the possibility of arranging them into microassemblies [6][7][8][9].…”
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