Assembly of Gold Nanoparticles Mediated by Multifunctional Fullerenes

Abstract

The understanding of the interparticle interactions of nanocomposite structures assembled using molecularly capped metal nanoparticles and macromolecular mediators as building blocks is essential for exploring the fine-tunable interparticle spatial and macromolecular properties. This paper reports the results of an investigation of the chemically tunable multifunctional interactions between fullerenes (1-(4-methyl)-piperazinyl fullerene, MPF) and gold nanoparticles. The interparticle spatial properties are defined by the macromolecular and multifunctional electrostatic interactions between the negatively charged nanoparticles and the positively charged fullerenes. In addition to characterization of the morphological properties, the surface plasmon resonance band, dynamic light scattering, and surface-enhanced Raman scattering (SERS) properties of the MPF-mediated assembly and disassembly processes have been determined. The change of the optical properties depends on the pH and electrolyte concentrations. The detection of the Raman-active vibration modes (Ag(2) and Hg(8)) of C60 and the determination of their particle size dependence have demonstrated that the adsorption of MPF on the nanoparticle surface in the MPF-Au nm assembly is responsible for the SERS effect. These findings provide new insights into the delineation between the interparticle interactions and the nanostructural properties for potential applications of the nanocomposite materials in spectroscopic and optical sensors and in controlled releases.

Uptake of pH-Sensitive Gold Nanoparticles in Strong Polyelectrolyte Brushes

“…The shift of the peak to a higher wavelength for decreasing pH was explained by the decrease in the interparticle distance. This is in agreement with previous results from Lim et al [55], where decreasing of the interparticle distance leads to a red-shift of the SPR peak.…”

Adenovirus Knob Trimers as Tailorable Scaffolds for Nanoscale Assembly

“…At r 1 of 500–1000 large aggregates (>500 nm) were observed (Figure S3 of Supporting Information). Similar fractal like growth has been observed in similar assembly nanosystems originating from Cit‐capped Au particles in aqueous solutions 34. The unique phenomena of the knob‐1 system at r 1 > 1500 revealed an isolated nanoparticle phase, as suggested by UV/Vis and DLS, which consisted of only knob‐1 encapsulated Au.…”

Assembly/Disassembly of DNA‐Au Nanoparticles: A Strategy of Intervention

“…The gold nanoparticles used in this study display a surface plasmon (SP) resonance band at about 520 nm (Figure 1), the shift of which is correlated to the change in the size, interparticle distance, and dielectric medium [28][29][30][31][32]. As shown in Figure 1(a), the solution of the DNA capped nanoparticles (A1 + A2) (red solution) exhibited an SP band at 525 nm.…”