Toshiharu Teranishi

The mean diameter of monodispersed Pd nanoparticles could be controlled from 17 to 30 Å in a one-step reaction by changing the amount of protective polymer, poly(N-vinyl-2-pyrrolidone) (PVP) and the kind and/or the concentration of alcohol in the solvent. Although increasing the amount of protective polymer made the size of Pd nanoparticles smaller, the particle size appeared to have a lower limit determined by the kind of alcohol. On the other hand, monodispersed Pd nanoparticles of smaller dia

We describe a simple method to control the size of Pt nanoparticles with the use of an alcohol reduction. They then are assembled on the electrode by an electrophoretic deposition. The mean diameter of monodispersed Pt nanoparticles can be controlled from 19 to 33 Å in one-step reaction by changing the kind and/or the concentration of alcohol in water and the amount of protective polymer, poly(N-vinyl-2-pyrrolidone) (PVP). The monodispersed Pt nanoparticles of smaller diameter are obtained in th

A simple method to manipulate the size of gold nanoparticles—involving heat treatment in the solid state—is reported by these authors. It is demonstrated that the nanoparticle size can be controlled from 3 to 10 nm by changing the heat-treatment temperature and/or the stabilizing agent in the presence of tetraoctylammonium bromide. The Figure shows 6.8 nm particles heat-treated at 190 °C.

Chemical control over the size of nanoparticles is a prerequisite for their application. The synthesis of protective polymers having cyano or mercapto groups (e.g., MMS-NVP, see Figure) is reported, together with the influence of these polymers on the size and size distribution of gold nanoparticles synthesized by KBH4; reduction. The results obtained using a linear protective polymer without a cyano or mercapto group are compared.

The anisotropically phase-segregated CoPd sulfide nanoparticles, named "CoPd nanoacorns", were spontaneously generated by reducing the corresponding metal precursors with 1,2-hexadecanediol in the presence of various alkanethiols. The CoPd nanoacorn consisting of crystalline Co9S8 and amorphous PdSx phases with the Co9S8 (001) plane at their interface was found to spontaneously form through the anisotropic growth of the Co9S8 phase after the generation of PdSx nanoparticles.

Ordered ultrafine platinum particles are expected to have properties differing from those of isolated particles, however, few measurements have been made because of the difficulty of producing monodispersed Pt particles. A method is reported for controlling the size and size distribution of polymer‐protected ultrafine Pt particles, which can be ordered densely in two dimensions to give Pt particle monolayers by electrophoretic deposition. The structure of the particles and the importance of the

The crystal structure of ionic nanocrystals (NCs) is usually controlled through reaction temperature, according to their phase diagram. We show that when ionic NCs with different shapes, but identical crystal structures, were subjected to anion exchange reactions under ambient conditions, pseudomorphic products with different crystal systems were obtained. The shape-dependent anionic framework (surface anion sublattice and stacking pattern) of Cu2O NCs determined the crystal system of anion-exch

The Ni atoms are deposited on the surface of the monodispersed Pd nanoparticles of 25 Å in size (magic number = 561) by reducing (CH3COO)2Ni·4H2O in 1-propanol under N2 at Ni/Pd molar ratios of 1/561 to 561/561 to obtain a series of Pd/Ni nanoparticles. The band structure of the Pd/Ni nanoparticles (Ni/Pd = 38/561) is quite similar to that of bulk Ni, which is considered to be closely related to the appearance of the giant magnetic moment.

Highly efficient photoenergy conversion in semiconductor nanoparticle heterostructures requires the formation of epitaxial heterointerfaces and band alignment engineering. This requirement has led to attention being given to recent advances and prospects in the charge separation properties of type-II semiconductor heterodimers composed of chalcogenide–chalcogenide blends. Type-II semiconductor heterodimers with a staggered alignment of band edges at the heterointerface can be synthesized by seed

ESR study on monodispersed palladium nanoparticles with the mean diameters of 25 Å corresponding to the "magic atom number" of 561 atoms (five-shell nanoparticle) and smaller than 25 Å (22 and 23 Å) was carried out to investigate their electronic structures. Two broad absorption peaks corresponding to ΔS = 1 and 2 and a sharp one with ΔS = 1 were observed in the ESR spectra of palladium nanoparticles. The broad and strongest spectrum with ΔS = 1 may arise from the spin on the large orbital momen

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Organization of Au Nanoparticles Protected by 2,6-Bis(1'-(8-thiooctyl)benzimidazol-2-yl)pyridineToshiharu Teranishi, Masa-aki Haga, Yoichi Shiozawa, and Mikio MiyakeView Author Information School of Materials Science Japan Advanced Institute of Science and Technology 1-1 Asahidai, Tatsunokuchi, Nomi Ishikawa 923-1292, Japan Department of Applied Chemistry Faculty of Science and Engineering Chuo University, 1-13-27 Kasuga, Bunkyo-ku Tokyo 112

Optimizing the stability and improving photoluminescence quantum yields (PLQYs) of all-inorganic halide perovskite nanocrystals has become an urgent and challenging task to promote its application in the field of optoelectronic devices. Lead halide perovskite CsPbX3 (X = Br, I, Cl) often suffers from many serious issues, mainly from changes in the environment (thermal, chemical, light excitation). To better solve these thorny problems, two different core–shell heterostructures were proposed to p

For fabrication of a planar array of 1D chains of gold nanoparticles prepared by a chemical process, the faceted (110) planes of sodium chloride crystals were used as templates to produce nanoscale ridge-and-valley structured carbon layers by a vacuum process. When these carbon layers loaded on copper grids were dipped in toluene solution of 3.4 nm gold nanoparticles followed by natural dry, a planar array of 1D chains of gold nanoparticles were formed on carbon layers, where the nanoparticles w