Silver Nanoparticles Capped by Long-Chain Unsaturated Carboxylates

Abstract

We study the preparation and capping of silver nanoparticles by several unsaturated long-chain carboxylates. UV-visible and FTIR spectroscopy and high-resolution electron microscopy are used to characterize the effect of the chain length, its configuration, and the degree of unsaturation on the size distribution of the nanoparticles. Langmuir layers and Langmuir-Blodgett films are used to study the adsorption of these carboxylates on the particles. We find that unsaturated carboxylates in the cis configuration are useful stabilizers for the control of particle size and its surface properties.

Titania–silver and alumina–silver composite nanoparticles: Novel, versatile synthesis, reaction mechanism and potential antimicrobial application

“…It was concluded that Ag + ions coordinated to the relatively free -COOH groups, then Ag nanoparticles formed on the surface of the TiO 2 particles with the oleic acid acting as a linker between the titania and Ag nanoparticles. These conclusions are in agreement with previous reports, since oleic acid is a well-known capping agent for Ag nanoparticles [44][45][46]. Figure 5B showed a main peak at 531.2 eV which was identified as O from alumina.…”

“…Moreover, in addition to shifting the pH to 9.26, the Ag + ions were reduced due to addition of NaBH 4 . Thus it could be concluded that oleic acid coordinated with the Ag nanoparticles through its head groups, as oleic acid is a well-known capping agent for Ag nanoparticles [44][45][46]. No significant shift was observed in the region 3010-2850 cm -1 throughout the synthesis (cf.…”

“…A new peak was observed at 1522 cm-1, attributed to the formation of an Ag-oleate complex with the -COOH groups of the second layer of oleic acid (cf. Curve 4, Figure 6) [44][45][46].…”

“…Curve 4, Figure 4). This was considered evidence that Ag + ions were interacting with the -COOH groups of oleic acid to form an Ag-oleate complex [44][45][46]. The 1519 cm -1 peak remained following the reduction of Ag + complex with NaBH 4 (cf.…”

In-situ fabrication of polyacrylate–silver nanocomposite through photoinduced tandem reactions involving eosin dye

“…[15] For instance, coaxial nanocables [16] with a nanometric silver core and covered by a polymer shell exhibit superior performance as nanocircuits [8] or nanosenors. [7] Such nanowires can be synthesized by either solution-phase methods using capping reactants [17,18] or by templating methods using inorganic porous material, [19] polymer membranes, [20,21] or block copolymer. [22] Another type of nanocomposites consists in a dispersion of metal particles into a polymeric matrix such as poly(vinyl alcohol), [23,24] poly(methyl methacrylate) [25] or poly(vinyl pyrrole) for instance.…”