Abstract Conformal deposition of platinum as ultrathin shells on facet-controlled palladium nanocrystals offers a great opportunity to enhance the catalytic performance while reducing its loading. Here we report such system based icosahedra. Owing lateral confinement imposed by twin boundaries and thus vertical relaxation only, overlayers evolve into corrugated structure under compressive strain. For core-shell with an average 2.7 overlayers, their specific mass activities towards oxygen...

After the tremendous advances over past two decades, micro-/nanorobots can effectively convert other forms of energy into propulsion and movement, as well be navigated to targeted locations under physiological conditions environments. They have been demonstrated potential load, transport, deliver therapeutic payloads directly disease sites, thereby improving efficacy reducing systemic side effects highly toxic drugs. In this feature article, various modalities ranging from...

We report a facile synthesis of multiply twinned Pd@Pt core–shell concave decahedra by controlling the deposition Pt on preformed Pd decahedral seeds. The atoms are initially deposited vertices seed, followed surface diffusion to other regions along edges/ridges and then across faces. Different from coating icosahedral prefer stay at seed even when is conducted 200 °C, naturally generating structure covered facets. nonuniformity in can be attributed presence twin boundaries vertices, as well...

Essentially all of the Ag nanowires reported in literature have sizes larger than 30 nm diameter. In this article, we report a simple and robust approach to synthesis with diameters below 20 aspect ratios over 1000 using one-pot polyol method. The took penta-twinned structure, they could be obtained rapidly (<35 min) high morphology purity (>85% as-obtained solid product) under atmospheric pressure. key success is restrain from lateral growth by employing both Br– ions poly(vinylpyrrolidone)...

Engineering the surface structure of noble-metal nanocrystals offers an effective route to development catalysts or electrocatalysts with greatly enhanced activity. Here, we report synthesis Pt-based icosahedral nanocages whose is enclosed by both {111} facets and twin boundaries while wall thickness can be made as thin six atomic layers. The are derived from Pd@Pt4.5L icosahedra selectively etching away Pd in core. During etching, multiply twinned fully retained whereas Pt atoms reconstruct...

Block copolymers have garnered significant attention in the past few decades due to their ability self-assemble into nanoscale structures (∼10–100 nm), making them ideal for emerging nanotechnologies, such as nanolithography, nanotemplating, nanoporous membranes, and ultrahigh-density storage media. Many of these applications require thin film geometries, which block form well-ordered nanostructures and/or precisely controlled domain orientations. In this Perspective, we discuss recent...

Injectable chemically powered nanomotors may revolutionize biomedical technologies, but to date, it is a challenge for them move autonomously in the blood circulation system and they are too large size break through biological barriers therein. Herein, we report general scalable colloidal chemistry synthesis approach fabrication of ultrasmall urease-powered Janus (UPJNMs) that have (100–30 nm) meeting requirement can efficiently body fluids with only endogenous urea as fuel. In our protocol,...

In this communication, we demonstrate that graphene oxide (GO) greatly inhibits the peroxidatic activity of a horseradish peroxidase-mimicking DNAzyme. Combining observation with unique DNA/GO interactions, an ultrasensitive GO-based chemiluminescence DNA biosensing platform is developed.

The use of seed‐mediated growth as a versatile approach to the synthesis penta‐twinned Cu nanorods with uniform diameters and controllable aspect ratios is reported. success this relies on our recent Pd decahedra, sizes in range 6–20 nm. decahedral seeds can direct heterogeneous nucleation along fivefold axis produce defined by lateral dimension original seeds. Due large mismatch lattice constants between (7.1%), deposited forced grow one side seed, generating nanorod an asymmetric...

We report a quantitative understanding of the reduction kinetics responsible for formation Pd–Pt bimetallic nanocrystals with two distinctive structures. The syntheses involve use KBr to manipulate reaction by influencing redox potentials metal precursor ions via ligand exchange. In absence KBr, ratio between initial rates PdCl42– and PtCl42– was about 10.0, leading Pd@Pt octahedra core–shell structure. presence 63 mM products became alloy nanocrystals. this case, precursors dropped 2.4...

This article describes a seed-mediated approach to the synthesis of Ag nanorods with thin diameters and tunable aspect ratios. The success this method is built upon our recent progress in Pd decahedra as uniform samples, together controllable sizes. When used seed, decahedron could direct deposition atoms along 5-fold axis generate nanorod, its diameter being determined by lateral dimension seed. We were able down 20 nm. Under conditions we for growth, symmetry breaking occurred only...

Abstract Swarming micro/nanomotors can self‐organize into cohesive groups to execute cooperative tasks. To date, research work has focused on the construction of egalitarian microswarms composed similar individuals. The and collective behaviors hierarchical leader–follower‐like are demonstrated. By inducing converging electrohydrodynamic flows under an AC electric field, dielectric microparticles with different sizes properties hierarchically attractive interactions, show novel emergent...

Abstract Artificial nanomotors are nanoscale machines capable of converting surrounding other energy into mechanical motion and thus entering the tissues cells organisms. They hold great potential to revolutionize diagnosis treatment diseases by actively targeting lesion location, though there many new challenges that arise with decreasing size nanoscale. This review summarizes comments on state‐of‐the‐art artificial advantages limitations. It starts fabrication methods, including common...

Abstract Biological enzyme‐functionalized antibacterial nanoparticles, which can degrade biofilm and kill bacteria under mild reaction conditions, have attracted much attention for the elimination of deep‐seated bacterial infections. However, poor diffusion penetration capabilities recently developed biological nanoparticles in severely impair eradication efficacy bacteria. Herein, a photothermal‐driven nanomotor (denoted as APPNM) is enhancing drug‐resistant biofilms The contained pot‐like...

Zinc oxide crystals grown by the seeded chemical vapor transport method have been annealed in zinc at 1100 °C for 30 min. These thermochemical reduction treatments produce a deep red coloration and increase their n-type electrical conductivity. Electron paramagnetic resonance (EPR), optical absorption, Hall measurements were used to monitor changes crystals. After an anneal, intense absorption band is present that extends from edge out approximately 550 nm, EPR signal near g=1.96 (due...

We report the results of a detailed investigation sol-gel-synthesized nanoscale Zn(1-x)Co(x)O powders processed at 350 °C with 0≤x≤0.12 to understand how structural, morphological, optical and magnetic properties ZnO are modified by Co doping, in addition searching for theoretically predicted ferromagnetism. With x increasing 0.03, both lattice parameters c hexagonal decreased, suggesting substitutional doping tetrahedral Zn(2+) sites. For x>0.03, these trends reversed showed gradual...

A robust fluorescent turn-on sensor with a detection limit of 10 nM was developed for detecting sulfite anions in water and real beverage samples. For this sensitive sensor, the reaction quenching moiety probe led to enhanced emission.

X-ray photoelectron spectroscopy (XPS) depth profiling with C60(+) sputtering was used to resolve the lithium-ion distribution in nanometer-scale domain structures of block polymer electrolyte thin films. The electrolytes interest are mixtures lithium trifluoromethanesulfonate and lamellar-forming polystyrene-poly(oligo(oxyethylene)methacrylate) (PS-POEM) copolymer. XPS results showed that concentration directly correlated POEM concentration. Furthermore, chemical state atomic composition...

Enzyme-powered micro/nanomotors propelled by biocompatible fuels generally show a weak propulsive force, which greatly limits their applications in complex biological environments. Herein, we have developed novel and versatile approach to significantly enhance the propulsion of enzyme-powered micromotors multilayered assembly enzymes. As an example, multilayers biotinylated ureases (BU) were asymmetrically immobilized on Janus Au/magnetic microparticles (MMPs) with assistance streptavidin...