ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTA "Tips and Tricks" Practical Guide to the Synthesis of Gold NanorodsLeonardo Scarabelli*†, Ana Sánchez-Iglesias†, Jorge Pérez-Juste‡, Luis M. Liz-Marzán*†§View Author Information† Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramon 182, 20009 Donostia-San Sebastian, Spain‡ Departamento Quı́mica Fı́sica, Universidade Vigo, 36310 Spain§ Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain*E-mail: [email protected]...

Hydrophobic interactions constitute one of the most important types nonspecific in biological systems, which emerge when water molecules rearrange as two hydrophobic species come close to each other. The prediction at level nanoparticles (Brownian objects) remains challenging because uncontrolled diffusive motion particles. We describe here a general methodology for solvent-induced, reversible self-assembly gold into 3D clusters with well-controlled sizes. A theoretical description process...

Regular gold nanodecahedra (pentagonal bipyramids) are obtained in high yield through ultrasound-induced reduction of HAuCl4 by dimethylformamide on presynthesized seeds (see figure). A dependence the final morphology crystalline structure is demonstrated growing single-crystal platinum nanoparticles, which yields uniform octahedra. Resolution Maxwell's equations for bicones shows good agreement with experimental optical properties. Supporting information this article available WWW under...

We show that thermal treatment of small Au seeds results in extensive twinning and a subsequent drastic improvement the yield (>85%) formation pentatwinned nanoparticles (NPs), with preselected morphology (nanorods, bipyramids, decahedra) aspect ratio. The "quality" thus defines obtained NPs, which case nanorods avoids need for additives such as Ag+ ions. This modified seeded growth method also improves reproducibility, can be stored extended periods time without compromising quality final...

The efficacy of drug delivery and other nanomedicine-related therapies largely relies on the ability nanoparticles to reach target organ. However, when are injected into bloodstream, their surface is instantly modified upon interaction with blood components, principally proteins. It well known that a dynamic multi-layered protein structure formed spontaneously nanoparticle contact physiological media, which has been termed corona. Although several determinant factors involved in corona...

Gold nanoparticles are encapsulatedwithin thermoresponsive pNIPAMmigrogels through an easy two-stepprotocol. The core/shell structure ofthe composite is characterized by TEM,AFM, PCS, and UV-vis spectroscopy. restricted environment thehigh porosity of the microgel shell arestudied overgrowth thegold core. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200800064_s.pdf or from author. Please note: publisher not responsible...

With strings attached: Gold nanorods undergo uniform electrostatic assembly on multiwall carbon nanotubes (MWNTs) to form of rods with end-to-end contacts (see picture, PSS=polystyrene sulfonate, PDDA=poly(diallyldimethyl)ammonium chloride). This arrangement results in uniaxial plasmon coupling, and the polarization-dependent optical response has been used monitor degree alignment within polymer films.

The optical extinction spectra of single silver nanoparticles coated with a silica shell were investigated in the size range 10−50 nm. Measurements performed using spatial modulation spectroscopy technique which permits independent determination both metal nanoparticle under study and width its localized surface plasmon resonance (LSPR). These parameters can thus be directly correlated at particle level for first time. results show linear increase LSPR inverse diameter small regime (less...

Single-crystalline Cu nanoplates with a prominent in-plane dipole surface plasmon band are fabricated through reduction of copper salt hydrazine using PVP as stabilizer and no need for inert atmosphere. Due to the lower free-electron character copper, interband transitions overlap, therefore damp, out-of-plane resonance (see image). Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...

Gold nanoparticles are prime candidates for cancer thermotherapy. However, while the ultimate target nanoparticle‐mediated photothermal therapy is cell, heating performance has not previously been evaluated in tumoral environment. A systematic investigation of gold nanostar heat‐generating efficiency situ presented: only cells vitro but also after intratumoral injection vivo. It demonstrated that (i) aqueous dispersion, heat generation governed by particle size and exciting laser wavelength;...

The three-dimensional (3D) atomic structure of nanomaterials, including strain, is crucial to understand their properties. Here, we investigate lattice strain in Au nanodecahedra using electron tomography. Although different tomography techniques enabled 3D characterizations nanostructures at the level, a reliable determination not straightforward. We therefore propose novel model-based approach from which coordinates are measured. Our findings demonstrate importance investigating 3D.

The combination of low electrical resistance and high optical transparency in a single material is very uncommon. Developing these systems scientific challenge technological need, to replace ITO flexible electronic components other highly demanding applications. Here we report facile method prepare layers densely aligned ultrathin Au-nanowires, homogeneous over cm2 areas. as-deposited films show an electrical/optical performance competitive with graphene-based electrodes. Moreover, the...

Pt nanoparticles play an essential role in a wide variety of catalytic reactions. The activity the particles strongly depends on their three-dimensional (3D) structure and exposed facets, as well reactive environment. High-resolution electron microscopy has often been used to characterize nanoparticle catalysts but unfortunately most observations so far have either performed vacuum and/or using conventional (2D) situ microscopy. latter however does not provide direct 3D morphological...

Poly(ethylene glycol) (PEG) has become the gold standard for stabilization of plasmonic nanoparticles (NPs) in biofluids, because it prevents aggregation while minimizing unspecific interactions with proteins. Application Au NPs biological environments requires use ligands that can target selected receptors, even presence protein-rich media. We demonstrate here stabilizing effect low-molecular-weight glycans on both spherical and rod-like under physiological conditions, as bench-marked...

Metal nanoparticles with a dumbbell-like geometry have plasmonic properties similar to those of their nanorod counterparts, but the unique steric constraints induced by enlarged tips result in distinct geometries when self-assembled. Here, we investigate gold dumbbells that are assembled into dimers within polymeric micelles. A single-particle approach correlated scanning electron microscopy and dark-field scattering spectroscopy reveals effects dimer variation on properties. The prepared...

The detection of cancer biomarkers at an early stage tumor development is vital for effective diagnosis and treatment cancer. Current diagnostic tools can often detect only when the biomarker levels are already too high, so that tumors have spread treatments less effective. It urgent therefore to develop highly sensitive assays such lowest possible concentration. In this context, we developed a sandwich immunoassay based on surface-enhanced Raman scattering (SERS) ultrasensitive...

Integrating cavity-enhanced colloidal quantum dots (QDs) into photonic chip devices would be transformative for advancing room-temperature optoelectronic and technologies. However, issues with efficiency, stability, cost remain formidable challenges to reach the single antenna limit. Here, we present a bottom-up approach that delivers QD-plasmonic nanoantennas electrical addressability. These QD nanojunctions exhibit robust photoresponse characteristics, plasmonically enhanced photocurrent...

This paper describes morphological and optical changes induced by seed-mediated growth of gold nanorods in the presence iodide ions. Addition small amounts to solution results nanoparticles with dumbbell-like structure, meaning that salt reduction takes place preferentially at rod tips. However, when excess is added, homogeneous observed, therefore original shape retained. By controlling experimental conditions, position longitudinal plasmon band grown can be shifted up as much 250 nm. These...

Nano-Autobahnen: Gold-Nanodrähte wurden als Template für die gerichtete eindimensionale Anordnung von Nanokügelchen und Nanostäbchen mit Oleylamin stabilisierendem Liganden genutzt. Die optische Antwort des Films lässt sich über Abstände zwischen den Nanopartikeln einstellen.

Abstract The sensitivity of localized surface plasmon resonances with respect to changes in the refractive index surrounding medium is measured for small (< 60 nm side length) and large (ca. 150 regular gold nanodecahedra (pentagonal bipyramids), compared rigorous solutions Maxwell's equations bicones based upon boundary element method (BEM). Small particles are prepared through ultrasound‐induced reduction HAuCl 4 by N , ‐dimethylformamide (DMF) on presynthesized penta‐twinned Au seeds,...

In the formation of colloidal molecules, directional interactions are crucial for controlling spatial distribution building blocks. Anisotropic nanoparticles facilitate clustering via steric constraints imposed by each specific shape, thereby restricting assembly along certain directions. We show in this Letter that combination patchiness (attraction) and shape (steric hindrance) allows assembling gold nanodumbbell blocks into crosslike dimers with well-controlled interparticle distance...

Quantum dot based thermometry, in combination with double beam confocal microscopy, was used to investigate the absorption/heating efficiency of gold nanoparticles different morphologies (nanorods, nanocages, nanoshells, and nanostars), all them an intense localized surface plasmon resonance within first biological window, at around 808 nm. The heating found be strongly dependent on geometry nanostructure, largest values for nanorods long-edge nanostars, both efficiencies close 100%. Gold...