Kunio Awaga

Charge carrier control is a key issue in the development of electronic functions of semiconductive materials. Beyond the simple enhancement of conductivity, high charge carrier accumulation can realize various phenomena, such as chemical reaction, phase transition, magnetic ordering, and superconductivity. Electric double layers (EDLs), formed at solid-electrolyte interfaces, induce extremely large electric fields. This results in a high charge carrier accumulation in the solid, much more effect

Charging clusters: A hybrid of polyoxometalate (POM) molecules individually adsorbed onto the surfaces of single-wall carbon nanotubes (SWNTs) can be used as a cathode-active material in rechargeable lithium batteries. This POM/SWNT battery exhibited a very high capacity (>300 Ah kg−1) with a short charging/discharging time (<2 h). Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They a

In this paper we study an organic system of geometrical spin frustration. m-N-methylpyridinium \ensuremath{\alpha}-nitronyl nitroxide (m-${\mathrm{MPYNN}}^{+}$) is a spin-1/2 organic radical. The simple salt, m-${\mathrm{MPYNN}}^{+}$\ensuremath{\cdot}${\mathrm{ClO}}_{4}^{\mathrm{\ensuremath{-}}}$\ensuremath{\cdot}1/3 (acetone), crystallizes in a trigonal P3c1 space group, where the m-${\mathrm{MPYNN}}^{+}$ molecules exist as a dimer and the dimer units form a two-dimensional (2D) triangular latt

To enhance the electron transfer within the covalent organic frameworks (COFs), we obtained a nanocomposite of conductive poly(3,4-ethylenedioxythiophene) (PEDOT) and redox-active AQ-COF by performing a facile in situ solid-state polymerization inside the nanochannels of COFs. The PEDOT chains functioned like electron highways within the nanochannels, resulting in a PEDOT@AQ-COF nanocomposite with an excellent electrical conductivity of 1.1 S cm^-1 and a remarkably improved performance

The temperature dependence of the magnetic susceptibilities and the magnetizations for the three kinds of α-nitronyl nitroxides, 2-R-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide [with R=phenyl (I), 3-nitrophenyl (II), 4-nitrophenyl (III)] have been measured. It is found that the intermolecular spin interaction is ferromagnetic in the crystal of III, while it is antiferromagnetic in I or II. UV–visible absorption spectra suggests the enhancements of the π-electron delocalization an

We report a cooperative enhancement of the capacitor effects of RGO induced by nanohybridization with POM.

Geladene Cluster: Ein Hybridsystem aus einwandigen Kohlenstoffnanoröhren (SWNTs) mit individuell oberflächenadsorbierten Polyoxometallat(POM)-Molekülen kann als kathodenaktives Material in wiederaufladbaren Lithiumbatterien eingesetzt werden. Eine so aufgebaute POM/SWNT-Batterie war durch eine sehr hohe Kapazität (>300 Ah kg−1) und kurze Lade/Entladezeiten (<2 h) charakterisiert.

The magnetic properties of the 4:1, 6:1, 9:1, and 19:1 mixed crystals of galvinoxyl (4-[[3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene]methyl]-2,6 -bis(1,1-dimethylethyl) phenoxy) radical and its precursory closed shell compound, hydrogalvinoxyl, have been studied. From the measurements of the temperature dependence of the magnetic susceptibility, it is found that the ferromagnetic intermolecular interactions, which are lost below about 85 K in pure galvinoxyl because of the phase

X-Ray crystal analysis and MO calculations have been carried out on the organic radical, 2-(4-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-N-oxide, revealing a 2-D ferromagnetic network linked by Nδ+⋯ Oδ– Coulombic attraction.

Abstract The crystal structures and magnetic properties of heterocyclic thiazyl radicals and related materials have been examined. TTTA (=1,3,5-trithia-2,4,6-triazapentalenyl) exhibited a first-order phase transition between a paramagnetic high-temperature (HT) phase and a diamagnetic low-temperature (LT) phase, with a wide thermal hysteresis loop over the temperature range 230–305 K. The phase control of TTTA was achieved by pressure and by light irradiation. BDTA (=1,3,2-benzodithiazolyl) also