Organization Of Gold Nanoparticles Research Articles

Plasmon heating of one-dimensional gold nanoparticle chains

Metallic nanoparticle chains exhibit strong plasmon coupling in periodic arrays that provides numerous opportunities for manipulating heating at nanoscale. The energy transport in a chain is sensitive to the interparticle plasmon coupling. A better understanding of optical and heating properties of the chain would provide useful guidance for future design of the novel devices. In this work, we use the organization of gold nanoparticles as linear assemblies and perform a detailed analysis of the heating features as a function of the number of particle, interparticle spacing and particle size in the chains using General Mie Theory. The results show that the heat generation of particle presents an exponential decay with increasing of the interparticle spacing. As the number of particle increases, the particle spacing increases and radius decreases, the boundary effect is gradually diminished to the center particle. When the particle spacing is 1 nm, the number of particle is seven and the radius is 10 nm, the heat production of center particle is 1.65 times than that of a single particle. The large particle size effectively increases the cross-section of absorption as well as the range of electromagnetic radiation, and thus more light energy can be absorbed and converted into heat as the radius increases. This study provides an original understanding on the plasmon heating behavior of one-dimensional nanoparticle chains and may be generalized to other types of aggregates formed by large numbers of interacting particles.

Lamellar multilayer hexadecylaniline-modified gold nanoparticle films deposited by the Langmuir-Blodgett technique

Organization of hexadecylaniline (HDA)-modified colloidal gold particles at the air-water interface and the formation thereafter of lamellar, multilayer films of gold nanoparticles by the Langmuir-Blodgett technique is described in this paper. Formation of HDA-capped gold nanoparticles is accomplished by a simple biphasic mixture experiment wherein the molecule hexadecylaniline present in the organic phase leads to electrostatic complexation and reduction of aqueous chloroaurate ions, capping of the gold nanoparticles thus formed and phase transfer of the now hydrophobic particles into the organic phase. Organization of gold nanoparticles at the air-water interface is followed by surface pressure—area isotherm measurements while the formation of multilayer films of the nanoparticles by the Langmuir-Blodgett technique is monitored by quartz crystal microgravimetry, UV-Vis spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscopy.

Benzene- and Anthracene-Mediated Assembly of Gold Nanoparticles at the Liquid−Liquid Interface

The organization of gold nanoparticles at the liquid−liquid interface between the gold hydrosol and benzene as well as anthracene in chloroform is described. Vigorous stirring of the biphasic mixture results in almost complete transfer of the gold nanoparticles from the aqueous to the benzene phase and the subsequent assembly of the gold nanoparticles at the liquid−liquid interface. In the case of anthracene in chloroform, the gold nanoparticles assembled directly at the interface forming an extremely flexible membrane. The gold nanoparticle films formed at the interface in both cases could be transferred onto different solid supports and were analyzed by a host of techniques. The films show reasonable two-dimensional ordering of the gold nanoparticles over large length scales. It was observed that the benzene and anthracene molecules are strongly bound to the gold particle surface, presumably through cation−π interactions between the aromatic molecules and nanoparticle surface-bound Au+ ions, thus openin...

Site-Specific Organization of Gold Nanoparticles by Biomolecular Templating

Site-Specific Organization of Gold Nanoparticles by Biomolecular Templating