Noncovalent Interaction between Gold Nanoparticles and Multiwalled Carbon Nanotubes via an Intermediatory

Abstract

A new and effective method has been developed where self-assembled gold nanoparticles (Au-NPs) of ∼10 nm diameter are successfully attached onto the surface of sidewalls and ends of thiol-terminated multi-walled carbon nanotubes (MWNTs) functionalized with orthomercaptoaniline, acting as a bridging agent. It can bridge the carbon nanotubes (CNTs) and Au-NPs via the bi-functional moiety with benzene unit at one end and thiol group at the other end by self-assembly. The ortho-mercaptoaniline was first grafted onto the surface of the CNTs via π-π interaction between the benzene ring of the mercaptoaniline and π-conjugated body of MWNTs surface to produce thiol-terminated CNTs. The bare surface of Au-NPs facilitates to attach on the thiol group of the thiol-terminated CNTs. Attenuated total reflectance FTIR, UV-visible, Raman spectroscopy and X-ray powder diffraction studies were used to verify whether the mercapto-benzene moieties have been attached to the π-conjugated body of functionalized MWNTs. The direct evidence is obtained from transmission electron microscope (TEM) images where selfassembled Au-NPs are attached onto the functionalized MWNTs.

Novel ascorbic acid sensor prepared from gold/aniline-pentamer-based electroactive polyamide composites

“…The diffraction pattern in Figure 4 curve b is in good agreement with face-centered cubic structure of metallic gold (JCPDS: 04-0784) [25,44].The peaks at 38.17, 44.28, 64.61and 77.72° are assigned to facecentered cubic bulk Au (111), (200), (220) and (311), respectively [45,46]. The crystallite size is calculated by Debye-Scherrer formula [47]: D = Kλ/βcosθ, where D is the particle size, K is the Scherrer constant (shape factor), λ is the wavelength of the X-ray, β is the full width half maximum (FWHM), θ is the Braggle angle.…”

Carbon nanotube bottles for incorporation, release and enhanced cytotoxic effect of cisplatin

“…Caps were made of gold nanoparticles (GNPs) functionalised with alkanethiols in order to tune their size and surface properties. It has been demonstrated that alkanethiols readily assemble as a monolayer on the surface of gold [14], [15], [16], [17], [18], [19], [20], [21], [22], which is facilitated by strong bonds between gold and sulphur, and readily formed under ambient conditions. In addition, GNPs can be detected quite easily under the Transmission Electron Microscope (TEM).…”

Preparation and characterization of a composite of gold nanoparticles and single-walled carbon nanotubes and its potential for heterogeneous catalysis

“…Both spectra show the characteristic π plasmon band of SWNTs at ~270 nm [43]. The SWCNT spectrum shows very weak bands at ~700 nm and 750 nm that correspond to the electronic transitions between the Van Hove singularities in the nanotube density of states, in these cases the E 11 transitions for metallic arc discharge nanotubes [44] (see inset)…”

“…The Au/SWCNT shows an additional clear broad absorption band at ~560 nm which corresponds to a Au surface plasmon resonance band [44] and is characteristic of suspended Au particle sizes of ≤15nm [45]. In the spectrum of the composite material, the π plasmon band is somewhat dampened and red shifted by the presence of the Au nanoparticles.…”