A great challenge for nanotechnology is to controllably organize anisotropic nanomaterials into well-defined three-dimensional superstructures with customized properties. Here we successfully constructed Au nanorod (AuNR) helical (helices) tailored chirality in a programmable manner. By designing the 'X' pattern of arrangement DNA capturing strands (15nt) on both sides two-dimensional origami template, AuNRs functionalized complementary sequences were positioned and assembled AuNR helices...

Precisely controlling the architecture and spatial arrangement of plasmonic heterostructures offers unique opportunities to tailor catalytic property, whereas lack a wet-chemistry synthetic approach fabricating nanostructures with high-index facets limits their practical applications. Herein, we describe universal strategy construct Au/Rh freestanding superstructures (SSs) through selective growth ordered Rh nanoarrays on high-index-faceted Au nanobipyramids (NBPs). This works various metal...

Precise control over surface functionalities of nanomaterials offers great opportunities for fabricating complex functional nanoarchitectures but still remains challenging. In this work, we successfully developed a novel strategy to modify gold nanorod (AuNR) with specific recognition sites using DNA origami clamp. AuNRs were encapsulated by the through hybridization single-stranded on and complementary capture strands inside Another set outside clamp create AuNR surface. By means strategy,...

Herein, we report self-assembled reconfigurable plasmonic diastereomers based on DNA nanotechnology. Up to three chiral centers were organized by dynamic origami platforms. Meanwhile, each center could be individually controlled switch between left-handed and right-handed states. Thus, complex with eight stereoisomers achieved, driven programmed reactions. With these diastereomers, demonstrated the existence of strong cross-talk near-field coupling among centers, substantially contribute...

Circular differential scattering (CDS) spectroscopy has been developed as a powerful method for the characterization of optical activity individual plasmonic nanostructures and their complexes with chiral molecules. However, standard measurement setups often result in artifacts that have long raised concerns on interpretation spectral data. In fact, detection limit CDS is constrained by high level artifacts, to ±10%. We address this issue means detailed theoretical description changes...

Asymmetric three-dimensional (3D) nanoarchitectures that cannot coincide with their mirrored-symmetric counterparts are known as chiral objects. Numerous studies have focused on plasmonic created intentionally 3D asymmetric configurations, whose chirality is promising for various nanoplasmonic and nanophotonic applications. Here, we show gold nanorod (AuNR) assembled a soft 2D DNA origami template, which was often simplified to be rigid rectangle, can exhibit strong chiroptical activities....

Incorporating metal nanocrystals with semiconductor photoanodes significantly enhances the efficiency of energy conversion in visible range during water splitting due to excitation hot electrons. While extensively studied on ensemble samples, electron response a photoelectrochemical cell remains unexploited at single-particle level. Herein, we systematically investigate individual single-crystalline gold (AuNCs) TiO2 photoanode splitting. We directly correlate morphology AuNC and its...

Chiral plasmonic nanocrystals have recently attracted increasing attention in circular polarization-dependent photocatalysis driven by hot carriers. While being concealed traditional ensemble measurements, the individual chiral photocatalytic activity of can exclusively be revealed directly correlating differential photocurrent response to helical morphologies using single-particle techniques. Herein, we develop a method named mapping (CDPM) and demonstrate that CDPM used characterize...

Iron oxides are directly coated on the surface of cetyl-trimethylammonium bromide (CTAB)-capped gold nanorods (AuNRs) in aqueous solutions at room temperature, which results AuNR@Fe2O3, AuNR@Fe3O4, and AuNR@Fe2O3@Fe3O4 core–shell heterostructures. The iron oxide shells uniform, smooth, with characteristic porous structure, their thickness can be readily tuned. shell formation is highly dependent reaction parameters including pH CTAB concentration. Fe2O3 amorphous exhibits nearly zero...

A significant challenge exists in obtaining chiral nanostructures that are amenable to both solution-phase self-assembly and solid-phase preservation, which enable the observation of unveiled optical responses impacted by dynamic or static conformation incident excitations. Here, meet this demand, we employed DNA origami technology create quasi-planar satellite-core nanoparticle superstructures with an intermediate geometry between monolayer double layer. We disentangled complex mechanisms,...

Chiral ligands are considered a required ingredient during the synthesis of dissymmetric plasmonic metal nanocrystals. The mechanism behind generation chiral structures involves formation high Miller index facets, induced by adsorption such ligands. We found, however, that chirality can also evolve spontaneously, without involvement any ligands, co-deposition Au and Ag on nanorods. When using specific Au/Ag ratio, phase segregation two metals leads to an interface within obtained AuAg shell,...

We demonstrated the trace detection of chiral J-aggregated molecules adsorbed on individual Au nanorods, and found that circular dichroism strongly coupled can be amplified to a detectable level.

Active plasmonic metamolecules under microscopic observation are promising for optical reporters in single molecule sensing applications. While self-assembled reconfigurable chiral can be conveniently engineered with functionalities, their is usually based on ensemble measurements, where the chiroptical response of enantiomers tend to cancel each other circular dichroism. Herein, we demonstrate enantiomeric switching individual active DNA origami-assembled metamolecules. The immobilized a...

We demonstrate a CTAB-templated approach towards direct coating of mesoporous titania on gold nanorods in aqueous solutions.

A series of 3D AuNR dimers and trimers were fabricated under the guidance DNA origami.

Monolithic integrated photoelectrochemical devices consisting of semiconductors and co-catalysts have always been restricted by the trade-off between light absorption catalytic activity upon frontside illumination. Herein, we proposed a facile strategy to spatio-selectively deposit Pt catalyst on top p-Si micro-pyramids, which not only enables substantial but also immensely boosts charge transport mass transfer. With help dark-field microscopy microscopic photocurrent mapping, it is revealed...

Surface modifications of plasmonic nanoparticles with metal adsorbates are essential in applications such as sensing, plasmon‐enhanced photocatalysis, etc., where spectral broadening is usually observed. A single particle study presented on plasmon damping by adsorption platinum (Pt) clusters. Single dark‐field spectroscopy employed to measure exactly the same gold nanorod before and after Pt adsorption. The Pt‐induced terms linewidth increase found dependent resonance wavelength measured...

Self-assembly of metal nanocrystals is able to create a gap sub-nanometer distance for concentrating incoming light by the strong coupling surface plasmon resonance, known as 'hot spot'. Although plasmonic property silver better than other metals in visible range, superior Raman enhancement compared gold still under debate. To provide direct evidence, this work, we studied adsorption on assembled nanorods (AuNRs) using situ surface-enhanced scattering (SERS) measurements. The self-assembled...

We study a dimerized spin chain with biaxial magnetic interacting ions in the presence of externally induced three-site interactions out equilibrium. In general case, play role renormalizing effective uniform field. find that existence zero-energy Majorana modes is intricately related to sign Pfaffian Bogoliubov--de Gennes Hamiltonian and relevant ${Z}_{2}$ topological invariant. contrast, we show an exotic spin-liquid phase can emerge compass limit through Berezinskii-Kosterlitz-Thouless...

Fano resonance and Fano-like circular dichroism induced by electric–magnetic dipole coupling are observed in a simple heterodimer nanostructure.

Abstract A synthetic approach has been developed towards encapsulating gold nanorods (AuNRs) with conductive ruthenium oxide (RuO 2 ) by the hydrolysis of (III) acetylacetonate in presence cetyltrimethylammonium bromide (CTAB) an autoclave. The reaction conditions are investigated systematically. resultant AuNR@RuO heterostructures encapsulated uniform RuO shells and monodispersed aqueous solutions. Correlated dark‐field microscopic (DFM) scanning electron (SEM) characterizations on...

"Hot spots" – a kind of highly active site, which are usually composed some unique units, such as defects, interfaces, catalyst particles or special structures can determine the performance nanomaterials. In this paper, we study model system, i.e. "hot on single Ag nanowire in galvanic replacement reaction (GRR), by dark-field microscopy. The research reveals that electric charge be released formation AgCl, and consequently electrochemical potential drops. could induce reduction Ag+ to form...