Carbon-coated silver nanoparticles

Tsai YC, Hsu PC, Lin YW, Wu TM (2009) Electrochemical deposition of silver nanoparticles in multiwalled carbon nanotube-alumma-coated silica for surface-enhanced Raman scattering-active substrates. Electrochem Commun 11 542-545... 

Also investigating surface textiles electrodes, Pylatiuk et al. (2009) compared five different conductive materials three types of silicone rubbers loaded with carbon or other nanoparticles, silver-coated polyamide yams and a flexible thermoplastic elastomer loaded with silver-coated glass microspheres. The results of the test electrodes were compared with those of a standard Ag/AgCl gel electrode. It was found that the silicone mbbers and the coated polyamide yams gave results comparable to the reference gel electrodes. The nanoparticle-loaded silicone mbber gave very favourable results with the ability to be used dry and a signal to noise ratio better than the gel electrode reference. 

XPS is especially suitable for studies of chemical bonding and molecular composition, and may be used for depth-prohle analysis of the outermost layers of a textile. " In our laboratory, we were able to establish changes in elemental composition on the surface of a silver-treated carbon fabric, shown in Rg. 5.4a, to which dilutions of 10% and 20% of a proprietary silver nanoparticle suspension had been applied by dip coating. Elemental composition results are presented in Table 5.1. From these results, we confirmed the presence of silver ions on the carbon fabric surface. Agj electron position is in accordance with the literature. In addition, the atomic ratio of... 

Other applications of PVA-based hydrogels include different coatings for metals (e.g., silver nanoparticles, or Ag NPs [Eisa et al. 2012]), carbon nanotubes (CNTs) (Malikov et al. 2014), or cellulose (Han et al. 2014), as well as paper coatings, water-soluble packaging films, textile sizing, and hydrophilic membranes for pervaporation (Zhang et al. 2012). 

UV-Vis absorbance spectroscopy measurements were performed on a Spectra Max 190 plate reader (Molecular devices, Sunnyvale, USA) operated at a resolution of 1 nm. Fourier transform infrared (FTIR) analysis of the samples dried in KBr pellet was performed on a Nicolet Model 6700 spectrophotometer in a difiuse transmittance mode at 4 cm resolution. XRD of dried silver nanoparticle samples drop-coated on glass substrate was performed on a PANalytical X pert PRO X-ray diffractometer (Netherlands), operated at 40 kV and at a current of 40 mA. TEM measurements for the samples prepared on carbon-coated copper grids were performed on a HR-TEM (JEOL-Model 3010) operated at an accelerating voltage of 200 keV. 

In addition to the above, preparation in w/o microemulsions of nanoparticles of various other types of compounds, viz. silica-coated iron oxide, Fe203-Ag nanocomposite, oxides of ytrium, erbium, neodymium, vanadium and cobalt, titanates of barium and lead, ferrites of barium, strontium, manganese, cobalt and zinc, oxide superconductors, aluminates, zirconium silicate, barium tungstate, phosphates of calcium, aluminium and zinc, carbonates of calcium and barium, sulphides of molybdenum and sodium, selenides of cadmium and silver etc. have been reported. Preparative sources and related elaboration can be found in [24]. 

In in-situ polymerization, nanoscale particles are dispersed in the monomer or monomer solution, and the resulting mixture is polymerized by standard polymerization methods. This method provides the opportunity to graft the polymer onto the particle surface. Many different types of nanocomposites have been processed by in-situ polymerization. Some examples for in-situ polymerization are polypyrrole nanoparticle/amphiphilic elastomer composites magnetite coated multi-walled carbon nanotube/polypyrrole nanocomposites and polypyrrole/ silver nanocomposites. The key to in-situ polymerization is appropriate dispersion of the filler in the monomer. This often requires modification of the particle surface because, although dispersion is easier in a liquid than in a viscous melt, the settling process is also more rapid. 

---