Materials Literature
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Spin-coherent quantum transport in carbon nanotube magnetic tunnel junctions is investigated theoretically. A spin-valve effect is found for metallic, armchair tubes, with a magnetoconductance ratio ranging up to 20%. Because of the finite length of the nanotube junctions, transport is dominated by resonant transmissi…
The longitudinal d33 piezoelectric coefficient was studied in rhombohedral Pb(Zr0.6Ti0.4)O3 thin films with (111), (100), and “random” orientation. The largest d33 was found in (100)-oriented films and the smallest along the polarization direction in (111)-oriented films. These results are in a good qualitative agreem…
Y 2 O 3 -doped Eu3+ (Y2O3:Eu) nanometer particles (NPs) were synthesized via a chemical route. The particle size estimated by x-ray diffractometry and transmission electron microscopy was about 61 nm. Two photoluminescence peaks were observed at 582 and 587 nm, being attributed to the transition of D05→F1a7 of Eu3+ in…
Individual semiconducting single-walled carbon nanotubes (SWNTs) of various diameters are studied by electrical measurements. Transport through a semiconducting SWNT involves thermal activation at high temperatures, and tunneling through a reverse biased metal–tube junction at low temperatures. Under high bias voltage…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFuran-Fused TCNQ and DCNQI: Synthesis and PropertiesKazuyuki Takahashi and Keiji KobayashiView Author Information Department of Chemistry, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan Cite this: J. Org. Chem. 2000, 65,…
He I and He II gas-phase photoelectron spectra of Rh 2 (O 2 CCF 3 ) 4 are reported. The electron configuration of the metal−metal bond of Rh 2 (O 2 CCF 3 ) 4 is determined to be σ 2 π 4 δ 2 δ* 2 π* 4 with an ionization energy order of σ ≈ π > δ > δ* ≈ π*. The δ* and π* ionization energies are similar within the range…
Physical vapor deposition of hexadecafluorophthalocyaninatozinc (F 16 PcZn) is performed under UHV conditions from monolayer coverages to an average thickness of about 20 nm on the (100) surfaces of NaCl, KCl, and KBr and on quartz glass as well as on microstructured interdigitated electrode arrays on amorphous SiO 2…
Polyelectrolytes such as single and double stranded DNA and many synthetic polymers undergo two structural transitions upon increasing the concentration of multivalent salt or molecules. First, the expanded-stretched chains in low monovalent salt solutions collapse into nearly neutral compact structures when the densi…
We report transient photocurrent measurements on solar cell structures based on dye-sensitized, porous TiO 2 films filled with a liquid electrolyte. The measurements are interpreted as ambipolar diffusion; under most measurement conditions, the ambipolar diffusion coefficient is dominated by electrons diffusing in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFulgides for Memories and SwitchesYasushi YokoyamaView Author Information Department of Materials Chemistry, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan Cite this: Chem. Rev. 2000, 100, 5, 1717–1740Publication D…
In their recent letter (28 Jan., p. 593), Michael J. Heben and Anne C. Dillon point out that we, along with another group of authors, had misinterpreted their research with hydrogen storage in carbon single-wall nanotubes. In our report, “High H2 uptake by alkali-doped carbon nanotubes under ambient pressure and moder…
The recent move towards liquid crystal displays based on the electrically controlled birefringence (ECB) effect of the vertically aligned nematic (VAN) material has brought improvements in terms of contrast, viewing angle and switching times. However, different types of nematic liquid crystalline materials are require…
A new electro-optic modulator system has been developed by the authors to replay dynamic holographic images. This Active Tiling<SUP>TM</SUP> system offers a route to replay giga- pixel computer generated hologram images with video refresh rates. High speed, medium complexity electrically addressed spatial light modula…
A cube-shaped cluster, TiRu3S4, is derived from the selective combination of hetero- and homodinuclear fragments TiRuS2 and Ru2S2, respectively (see scheme). The clusters exhibit a fluxional, temperature-dependant behavior, ascribed to the proximity of Ru centers. [Ru]=Cp*Ru, [Ti]=CpTi.
Eine Mischform aus Porphyrin und Calixpyrrol: Die Calix[n]phyrine 1 (n=4, 6, 8; x=1, 2, 3; Ar=C6H2(CH3)3) sind leicht durch Kondensation eines geeignet funktionalisierten Dipyrromethans mit Aceton und anschließende Oxidation mit 4,5-Dichlor-3,6-dioxo-1,2-benzoldinitril zugänglich. Die Strukturen dieser Moleküle zeigen…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTIntroduction of the Cluster Fragment Ru3(CO)11 at the Periphery of Phosphine Dendrimers Catalyzed by the Electron-Reservoir Complex [FeICp(C6Me6)]Ester Alonso and Didier AstrucView Author Information Groupe de Chimie Supramoléculaire des Métaux de Transition, LCOO, UMR…
Programmed to chelate the cis positions of metal ions, trans,cis,cis-[RuCl2(X)(Y)(4′-cisDPyP)2] compounds (X, Y=Me2SO, CO; 4′-cisDPyP=5,10-bis(4′-pyridyl)-15,20-diphenylporphyrin) react with [PdII(dppp)2(OTf)2] (dppp=propane-1,3-diylbis(diphenylphosphane), OTf=triflate) to yield unprecedented heterobimetallic molecula…
We demonstrate optical storage by means of trans−cis isomerization within melamine monomers as well as within the corresponding cross-linked melamine resins using holographic grating experiments. The melamine monomer is chemically linked with a photoaddressable azobenzene group. By thermal treatment the semicrystallin…
ADVERTISEMENT RETURN TO ISSUEPREVNotePreparation of Nanocomposite Poly(allylamine)−Poly(ethylene glycol) Thin Films Using Michael AdditionRyan J. Russell, Kaushik Sirkar, and Michael V. PishkoView Author Information Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122 Cite this:…
Eine generell anwendbare Suzuki-Srategie für die Synthese von β-funktionalisierten Porphyrinen geht vom Bromporphyrin 1 aus, das zunächst in ein luft- und wasserstabiles Boronat überführt wird. Die metallvermittelte Kreuzkupplung dieser Verbindung mit Arylbromiden liefert β-Arylporphyrine 2 in ähnlich hohen Ausbeuten…