Multispectroscopic (FTIR, XPS, and TOFMS−TPD) Investigation of the Core−Shell Bonding in Sonochemically Prepared Aluminum Nanoparticles Capped with Oleic Acid

Abstract

Organically capped metal nanoparticles are an attractive alternative to more conventional oxide-passivated materials, due to the lower reaction temperatures and the possibility of tuning the organic coating. Sonochemical methods have been used to produce small (∼5 nm average size) air-stable aluminum nanoparticles capped with oleic acid. In order to understand the nature of the metal−organic bonding in the nanoparticles, we have used FTIR, XPS, and TOFMS−TPD techniques to study the organic passivation layer and its desorption at elevated temperatures. In the present case we find that the organic layer appears to be attached via Al−O−C bonds with the C atom formerly involved in the carboxylic acid functional group.

Metastable nanostructured metallized fluoropolymer composites for energetics

“…14 In order to mitigate this, Crouse et al have functionalized n-Al with oleic acid 15 and acrylic monomers 13 (used to further produce energetic nanocomposites 16 ) in order to minimize Secondary coatings, such as functionalization or additional passivation layers have been shown to provide further protection against increased oxidation thereby extending the shelf life of the core metal. [18][19][20] Peruoropolyethers (PFPEs) are low molecular weight uorinated oligomers that have been used in the aerospace, automotive, and machining industries because they are practically non-volatile and exhibit a nearly temperature independent viscosity.…”

Aluminum Nanocrystals

“…4 Chemical methods for the synthesis of Aluminum nanoparticles have involved the thermal decomposition of an aluminum hydride with a titanium catalyst, but size and shape control have proven to be problematic with this approach. [11][12][13][14][15][16][17][18][19] In this letter we report the facile synthesis of highly regular, faceted aluminum nanocrystals with controllable nanocrystal diameters ranging from 70 to greater than 200 nm.…”

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

“…Additionally, oleic-acid-passivated core-shell aluminum nanoparticles (30-nm diameter), produced via sonochemical methods, [21][22][23][24] were also studied for comparison purposes; these will be referred to below as 30-nm AlOA. Transmission-electron-microscopy (TEM) images of these samples show a broad size distribution of spherical nanoparticles, with average sizes close to the corresponding nominal diameters.…”