Selective Attachment of Gold Nanoparticles to Nitrogen-Doped Carbon Nanotubes

Abstract

Gold nanoparticles were selectively attached to chemically functionalized surface sites on nitrogen-doped carbon (CN x ) nanotubes. A cationic polyelectrolyte was adsorbed on the surface of the nanotubes by electrostatic interaction between carboxyl groups on the chemically oxidized nanotube surface and polyelectrolyte chains. Negatively charged 10 nm gold nanoparticles from a gold colloid suspension were subsequently anchored to the surface of the nanotubes through the electrostatic interaction between the polyelectrolyte and the nanoparticles. This approach provides an efficient method to attach other nanostructures to carbon nanotubes and can be used as an illustrative detection of the functional groups on carbon nanotube surfaces.

Increased flexural modulus and strength in SWNT/epoxy composites by a new fabrication method

“…indicates that even when SWNT are heavily functionalized with acid groups by extended refluxing with acid, the C=O band of the acid is very weak and somewhat broad when attached to SWNT [26], whereas the ester C=O band is comparatively strong and sharp and more intense [13]. The band at 1730 cm -1 in the heat-treated sample indicates the formation of ester groups by the reaction of carboxylic acid functional groups on the nanotubes with the epoxy rings, Scheme 1.…”

“…In addition to the bands characteristic to SWNT and epoxy resin, this FT-IR spectrum shows a band at 1730 cm -1 characteristic of an ester group. It is well known that acid treatments during the purification of SWNT produce defects in the nanotubes with the addition of few carboxylic acid groups (-COOH) at the defect sites [25][26][27][28]. In Fig.…”

Cu nanocrystal growth on peptide nanotubes by biomineralization: Size control of Cu nanocrystals by tuning peptide conformation

“…To apply nanocrystals as building blocks for practical electronic, magnetic, and optical devices, nanocrystals must be assembled. Although various nanocrystals have been assembled on flat substrates (11)(12)(13)(14)(15)(16)(17), the self-assembly of nanocrystals on cylindrical nanotube surfaces has also been reported recently (18)(19)(20)(21)(22)(23)(24)(25). When the coupling strength of overlapped wave functions between neighboring nanocrystals is tuned by compressing the lattice of nanocrystals, the range of tuning the electronic structures is considerable because the overlap depends exponentially on the interdot distance and the size (26,27).…”

Carbon Nanotubes and Carbon Nanotubes/Metal Oxide Heterostructures: Synthesis, Characterization and Electrochemical Property

“…Among the known examples, the deposition of ionic polyelectrolytes to attract charged nanoparticles is the most common route [127][128][129][130][131]. These polyelectrolytes typically bond covalently to the functional groups on the CNT, in contrast to polyethyleneimine (PEI), which interacts with CNTs via physisorption [132].…”