The alloy Au–Ag system is an important noble bimetallic phase, both historically (as “Electrum”) and now especially in nanotechnology, as it applied catalysis nanomedicine. To comprehend the structural characteristics thermodynamic stability of this alloy, a knowledge its phase diagram required that considers explicitly size shape (morphology) dependence. However, experimental determination remains quite challenging at nanoscale, theoretical guidance can provide significant advantages. Using...

Growth of anisotropic nanostructures enables the manipulation optical properties across electromagnetic spectrum by fine morphological tuning nanoparticles. Among them, stellated metallic present enhanced owing to their complex shape, and hence, control over final morphology becomes great importance. Herein, a seed-mediated method for high-yield production goldrich–copper concave branched structural characterization is reported. The synthesis protocol enabled excellent tunability morphology,...

Nickel-based bimetallic nanoalloys (nickel–palladium, nickel–platinum, nickel–rhodium, and nickel–iridium) play an important role in catalysis, electrocatalysis, magnetic applications. To improve the performance of those materials at nanoscale, knowledge their phase diagrams is critically needed. However, such still lacking because calorimetry experiments are extremely challenging to perform nanoscale. Then, a smart necessary alternative time-consuming obtain this from theoretical...

Abstract Throughout history, objects with fivefold symmetry have been a popular topic of interest for artists, philosophers, and scientists. This may be because is very conspicuous in nature. In the case crystals, rotational mathematically forbidden, macroscopic crystals exhibiting never shown to exist. Nevertheless, nanoworld, nanoparticles are often found decahedral icosahedral shapes that an overall pseudo‐fivefold symmetry. These structures observed at many length scales, from 1 nm up...

In this work, we report the synthesis and detailed structural characterization of novel helical gold–copper nanowires. The nanowires possess Boerdijk–Coxeter–Bernal structure, based on pile up octahedral, icosahedral, and/or decahedral seeds. They are self-assembled into a coiled manner as individual wires or parallel-ordering way groups wires. ultrathin with diameter less than 10 nm variable length several micrometers, presenting high density twin boundaries stacking faults. To best our...

We report the synthesis of ceria nanoparticles supported on multiwalled carbon nanotubes via a microwave-assisted method. The resulting composites were characterized by HRTEM, XRD, TGA and Raman spectroscopy. This method enabled growth ~1.4 nm homogeneously distributed surface nanotubes. adsorption effectiveness these materials was evaluated using methylene blue as model molecule. produced nanocomposites showed higher dye capability removal percentage (62.1 mg/g, 95.3%) than functionalized...

Given the binary nature of nanoalloy systems, their properties are dependent on size, shape, structure, composition, and chemical ordering. When energy entropic factors for shapes structure variations considered in nanoparticle growth, spectra become so vast that even metastable arrangements have been reported under ambient conditions. Experimental theoretical multiply twinned particles observed, from Ino Marks decahedra to polyicosahedra polydecahedra with comparable energetic stability...

Catalysts have been widely used in industries and can be optimized by tuning the composition chemical ordering of elements involved nano-alloy.

Nanoalloys have emerged as multi-functional nanoparticles with applications in biomedicine and catalysis. This work reports the efficient production advanced transmission electron microscopy characterization of gold–copper pentagonal nanostars. The morphology branches is controlled by adequate choice capping agent. When oleylamine used rounded nanostars are produced, while pointed obtained using hexadecylamine. Both types were proved to be thermally stable could therefore therapeutic agents...

Currently, the search for inexpensive, non-toxic, and environmentally friendly materials optoelectronic applications has led to an increased interest in one-dimensional ZnO materials. Attributes such as their high surface area, crystalline phase purity, photoexcited response make them attractive light emission, biosensing, energy harvesting applications. However, there is still a need studies that correlate optical structural properties of these materials, so they can be integrated...

Herein, we report the synthesis of novel platinum-based nanoparticles with step-pyramidal growth induced by poly(diallyldimethylammonium chloride) (PDDA). The complex stepped pyramidal shape became central point for outstanding catalytic reduction 4-nitrophenol, overcoming activity bare Pt nanoparticles. These results are valuable degradation reactive molecules.

Abstract Understanding the physical mechanisms of thiolated molecules adsorption on metal surfaces has required copious research, particularly Au–cysteine systems due to affinity sulfur gold surfaces, as well interesting structural modifications that this strong interaction induces and peculiar optical, chiroptical, electronic properties Au(SR) systems. Here, we present vibrational experimental data L ‐ D ‐cysteine small nanoparticles (<2 nm) by means Raman spectroscopy. adopt same...

Phase transition of molybdenum disulfide (MoS₂) was carried out in a pure monocrystal using combination milling and heating process.

We report the efficient wet-chemical production of self-assembled gold–copper bimetallic nanoparticles (diameter ∼2 nm) into two-dimensional flexible ribbonlike nanostructures. The direct observation a layered arrangement particles nanoribbons was provided through high-resolution transmission electron microscopy and tomography. These showed photoluminesce photocatalytic activity for conversion 4-nitrophenol. thermal stability also measured by in situ heat treatment microscope, confirming...

Samples of well-controlled nanoparticles consisting alloys cobalt and nickel different atomic ratios were synthesized using wet chemical methods with oleylamine as the solvent reducing agent. These materials characterized by a variety techniques, including high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray energy dispersive spectroscopy (EDS), diffraction (XRD). Small amounts heterogenized catalysts prepared alumina support. However, potential for use...

In this work we studied the semiconductor behavior of titanyl phthalocyanine (TiOPc) and vanadyl (VOPc), doped with anthraflavic acid deposited on Tetrapak/graphite as flexible electrodes. The molecular structure was approached using density functional theory astonishingly, it found that electronic can change depending metal in phthalocyanine. Experimentally, Root Mean Square to be 124 151 nm for VOPc-Anthraflavine TiOPc-Anthraflavine films, respectively, maximum stress 8.58 MPa film VOPc....

The field of nanoalloys has been advancing at a rapid pace in the last two decades. Many new characterization methods and theoretical advances have produced substantial knowledge nanoalloys' properties structure. Most work limited to binary alloys. A path forward for will be study with three or more metals. Adding components produce possibly fabrication controls. In this paper, we discuss challenges that arise multi-metallic nanoalloys. We show entropy twin boundaries play dominant role

Herein, the growth of Au nanoparticles on NaCl surfaces as a way to control their spatial distribution is explored, giving new insights into shape and relative orientation resulting through modern electron microscopy techniques. Their morphological features depending geometry surface site they nucleated are described in detail. Also, hitherto unreported small but systematic angular deviations range 1–4° from exact epitaxial were observed. A theoretical approach based straightforward elastic...