Nanocrystalline TiO2 was synthesized by the solution combustion method using titanyl nitrate and various fuels such as glycine, hexamethylenetetramine, oxalyldihydrazide. These catalysts are active under visible light, have optical absorption wavelengths below 600 nm, show superior photocatalytic activity for degradation of methylene blue phenol UV solar conditions compared to commercial TiO2, Degussa P-25. The higher is attributed structure catalyst. Various studies X-ray diffraction, Raman...

Ultrafine single-crystalline gold nanowires (see figure) are synthesized by oriented attachment of nanoparticles in the solution phase. An amine capping agent is preferentially removed from {111} planes, which causes wires to form fusion along these planes. Such can be used as fundamental building blocks for nanoelectronics, and will enable basic studies on electric transport one-dimensional structures carried out. Supporting information this article available WWW under...

We demonstrate an ultrafast method for the formation of graphene supported Pt catalysts by co-reduction oxide and salt using ethylene glycol under microwave irradiation conditions. Detailed analysis mechanism hybrids indicates a synergistic whereby presence ions leads to faster reduction GO defect sites on reduced serves as anchor points heterogeneous nucleation Pt. The resulting hybrid consists ultrafine nanoparticles uniformly distributed susbtrate. have shown that exhibits good catalytic...

We demonstrate a robust strategy for obtaining high dispersion of ultrafine Pt and PtRu nanoparticles on graphene by exploiting the nucleation metal precursor phase graphite oxide surfaces. Our method opens up new possibilities to engineer graphene-based hybrids applications in multifunctional nanoscale devices.

Platinum nanoparticles with average diameters of 2−3 nm have been coated on multiwalled carbon nanotubes by controlled attachment an intermediate the walls nanotube. Reduction leads to formation platinum which are uniformly nanotubes. This composite shows excellent electrocatalytic activity toward methanol oxidation and hence is a candidate material for fuel cell applications. Cyclic voltammetry chronoamperometry studies indicate that these composites better compared commercial Pt−carbon...

Semiconductor based nanoscale heterostructures are promising candidates for photocatalytic and photovoltaic applications with the sensitization of a wide bandgap semiconductor narrow material being most viable strategy to maximize utilization solar spectrum. Here, we present simple wet chemical route obtain ZnO/CdS without using any molecular linker. Our method involves nucleation Cd-precursor on ZnO nanorods subsequent sulfidation step leading formation heterostructures. Excellent control...

Faceted ZnO nanorods with different aspect ratios were synthesized by a solvothermal method tuning the reaction time. Increased leads to formation of high ratio largely bound prism planes. The rods showed significantly higher visible light photocatalytic activity when compared lower structures. It is proposed that due better charge separation in elongated 1D structure. In addition, fraction unsaturated Zn2+ sites on {100} facets, leading adsorption oxygen-containing species. These species...

The control of shapes nanocrystals is crucial for using them as building blocks various applications. In this paper, we present a critical overview the issues involved in shape-controlled synthesis nanostructures. particular, focus on mechanisms by which anisotropic structures high-symmetry materials (fcc crystals, instance) could be realized. Such require symmetry-breaking mechanism to operative that typically leads selection one facets/directions growth over all other symmetry-equivalent...

Abstract Multi‐electron NAtrium SuperIonic CONductor (NASICON)‐Nb 2 (PO 4 ) 3 (N 0 NbP) is an attractive Na‐ion battery anode, owing to its low intercalation voltage (1.4 V vs Na + /Na and high capacity (≈150 mAh g −1 ). However, it suffers from poor retention due structural degradation. To overcome this issue, extra ions are introduced at the Na(1) sites, via 3+ substitution, which can act as stabilizing agents hold lantern units together during cycling, producing NASICON‐Na 1.5 0.5 Nb...

Co3O4 nanoparticles of 35 nm with a cauliflower-like morphology were obtained when monolayer colloidal dispersion dodecyl sulfate intercalated alpha-cobalt hydroxide in butanol was subjected to solvothermal hydrolytic decomposition. The nanogranular particles exhibit weakly ferromagnetic properties contrast both bulk and dispersed nanoparticulate Co3O4.

A graphite oxide-intercalated anionic clay (nickel zinc hydroxysalt) has been prepared using the aqueous colloidal dispersions of negatively charged oxide sheets and aminobenzoate-intercalated layers as precursors. When two are reacted, interlayer aminobenzoate ions displaced from intercalated between positively clay. The thermal decomposition solid at different temperatures yields graphene-metal oxide/metal nanocomposites. Electron microscopic analysis composites indicates that...

We report a reversible phase transformation of platelet-shaped ZnS nanostructures between wurtzite (WZ) and zinc blende (ZB) phases by insertion/ejection dopant Mn(II) ions induced thermocyclic process. In reaction flask loaded with WZ platelets Mn molecular precursors, during heating are incorporated change the host to ZB; cooling spontaneously ejected, returning nanoplatelets original phase. These changes monitored for several cycles PL, EPR, XRD, HRTEM. Interestingly, (0001) transform...

Ceria, because of its excellent redox behavior and oxygen storage capacity, is used as a catalyst for several technologically important reactions. In the present study, different morphologies nano-CeO2 (rods, cubes, octahedra) were synthesized using hydrothermal route. An ultrafast microwave-assisted method was to efficiently attach Pt particles CeO2 polyhedra. These nanohybrids tested catalysts CO oxidation reaction. The CeO2/Pt with nanorods support found be most active catalyst. XPS IR...

Microwave-based methods are widely employed to synthesize metal nanoparticles on various substrates. However, the detailed mechanism of formation such hybrids has not been addressed. In this paper, we describe thermodynamic and kinetic aspects reduction salts by ethylene glycol under microwave heating conditions. On basis analysis, identify temperatures above which salt is thermodynamically favorable rates homogeneous nucleation heterogeneous supports favored. We delineate different...

Oxidation of small organic molecules in a fuel cell is viable method for energy production. However, the key issue development suitable catalysts that exhibit high efficiencies and remain stable during operation. Here, we demonstrate amine-modified ZnO nanorods on which ultrathin Au nanowires are grown act as an excellent catalyst oxidation ethanol. We show modification with oleylamine not only modifies electronic structure favorably but also serves to anchor nanorods. The adsorption OH(-)...

The facet chemistry of halide perovskite nanocrystals plays a key role in designing nanoscale epitaxial heterostructures. However, despite significant successes achieved these nanocrystals, their heterostructures with several leading transition metals could not be established yet. Herein, the possible beyond are explored and combinations soft CsPbBr3 post-transition metal Bi(0) reported. These built interfacing facets having hexagonal atomic configurations both rhombicuboctahedron octahedral...

Nanoporous structures with high active surface areas are critical for a variety of applications. Here, we present general templateless strategy to produce such porous by controlled aggregation nanostructured subunits and apply the principles synthesizing nanoporous Pt electrocatalytic oxidation methanol. The nature aggregate produced is tuning electrostatic interaction between surfactant-free nanoparticles in solution phase. When repulsive force particles very large, stabilized while...

Ferecrystals, a distinctive class of misfit layered compounds, hold significant promise in manipulating the phonon transport owing to their two-dimensional (2D) natural superlattice-type structure and turbostratic (rotational) disorder present between constituent layers. Integrating these 2D intergrowth structures as nanodomains embedded bulk thermoelectric matrix is formidable challenge synthetic chemistry, yet offers groundbreaking opportunities for efficient thermoelectrics. Here, we have...

The chemistry of designing epitaxial perovskite-chalcogenide nanocrystal heterostructures still could not be established yet in spite significant successes understanding both perovskite and chalcogenide nanostructures formation. Interfacing the ionic–covalent bonding at junction remains major obstacle for establishing seamless formation such nanostructures. Keeping compatibility Bi(III) ions with Pb(II) different lead halide nanocrystals, herein, multiple possibilities interface junctions...

Nanocrystalline Ce(1)(-)(x)Ti(x)O(2) (0 < or = x 0.4) and Ce(1-)(x)(-)(y)Ti(x)Pt(y)O(2)(-)(delta) (x 0.15, y 0.01, 0.02) solid solutions crystallizing in fluorite structure have been prepared by a single step solution combustion method. Temperature programmed reduction XPS study of 0.0-04) show complete Ti(4+) to Ti(3+) approximately 20% Ce(4+) Ce(3+) state compared 8% the case pure CeO(2) below 675 degrees C. The substitution Ti ions enhances reducibility CeO(2)....