Materials Literature
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The study reports the solid state photophysical properties of a series of alkyloxy-substituted oligo(phenyleneethynylene)s, methoxy to hexyloxy, supported by a detailed analysis of molecular packing obtained from single crystal X-ray diffraction data. While the emission peaks are highly red shifted (by as much as 114…
Dendritic phosphole oxides display intense emission in the aggregate and solid states, but no emission in solution, because the intramolecular rotational motions of the peripheral dendritic groups linked to the phosphole oxide core are restricted. This unique spectroscopic feature is ascribed to an aggregation-induced…
Upon the tunable surface plasmon band of the pH-induced reversible assembly of gold nanoparticles mediated by cysteine, the manipulation of green and red upconversion emission, and the switching of the red emission of the NaYF(4):Yb,Er nanoparticles have been achieved in a facile and reproducible way.
A polyethersulfone (PES) membrane was modified by blending with a co-polymer of acrylic acid (AA) and N-vinyl pyrrolidone (VP), followed by immobilization of bovine serum albumin (BSA) onto the surface. The scanning electron microscopy results showed that PES had good miscibility with the co-polymer. X-ray photoelectr…
Preferential oxidation of carbon monoxide in excess hydrogen (PROX) is one of the key processes for the production of clean hydrogen fuel for the polymer electrolyte membrane fuel cell (PEFC). Development of highly active and selective catalysts is among the most challenging works for decades. Platinum-based catalysts…
La 1 − x Sr x Mn O 3 cathodes used in solid oxide fuel cells have exhibited enhanced catalytic activity after polarization; however, the origin of this enhancement is not understood. In this study, dense La 0.8 Sr 0.2 Mn O 3 thin-film microelectrodes fabricated by sputtering were cathodically or anodically polarized,…
We showed for the first time how to tailor the permselectivity of mesoporous thin films by changing the electrostatic environment of the nanopores through the covalent functionalization with polyelectrolyte brushes.
By conducting a 1200°C vacuum annealing of a 3C-SiC(111) ultrathin film preformed on a Si(110) surface, we have succeeded in forming a graphene layer on a Si substrate. Raman-scattering spectrum from this surface presents a distinct 2D band, whose deconvolution into four subcomponents indicates that the film mostly co…
luminescence is studied in , and the emission spectrum shows an intense and broad green emission band with two peak maxima (475 and 505 nm). The two emission bands are due to present in the two crystallographic distinct Sr sites in the host lattice. luminescence is studied in and shows a broad and bright blue emission…
The frequency and temperature dependences of the dielectric constant and the electrical conductivity of the transparent glasses in the composition Li2O–3B2O3 were investigated in the 100 Hz–10 MHz frequency range. The dielectric constant and the loss in the low frequency regime were electrode material dependent. Diele…
Green-emitting phosphors of have been synthesized by solid-state reaction. The luminescence properties were characterized by photoluminescence (PL) and photoluminescence excitation spectra, reflection spectra, and a detection system using an integrating sphere equipped with a spectrofluorometer. With co-doping as a se…
In this paper we report on massive computer experiments aimed at finding spherical point configurations that minimize potential energy. We present experimental evidence for two new universal optima (consisting of 40 points in 10 dimensions and 64 points in 14 dimensions), as well as evidence that there are no others w…
Octahedral ruthenium complexes, capable of photodynamic singlet oxygen production at near 100% efficiency, were shown to cause light-dependent covalent crosslinking of p53 and PCNA subunits in mammalian cells and cell lysates. Azide, a singlet oxygen quencher, greatly reduced the p53 photocrosslinking, consistent with…
We describe a new approach to the purification of single-walled carbon nanotubes (SWCNTs), based on the selective oxidation of carbonaceous impurities by heating at a constantly increasing temperature (i.e. dynamic oxidation) in air. Using UV-VIS-NIR spectroscopy, Raman spectroscopy and transmission electron microscop…
This paper reports a facile, one-pot, room-temperature synthesis, in water, of various Au nanostructures using, as reducing agent, the mixed-valence polyoxometalate β-H3[H4P(MoV)4(MoVI)8O40]3−. By modifying the initial concentrations of the polyoxometalate and chloroauric acid, the morphology of the synthesized Au nan…
Two series of new V-shaped molecules, containing a central thiazole or thiadiazole bending unit have been synthesised. The design is based on shape-persistent phenylene ethynylene scaffolds that were attached stepwise with high regioselectivity to a desymmetrised iodo and bromo functionalised bent core with an apex an…
Narrow bandgap films of p- and n-type conductivities are electrodeposited on conducting glass substrates from aqueous solutions. These films exhibit photoelectrochemical responses under visible light illumination. The p- and n-type films have different preferred out-of-plane orientations of [111] and [100], respective…
Oxidation is one of the major pathways for the synthesis of chemical intermediates. The epoxidation of alkenes by the electrophilic addition of oxygen to a carbon–carbon double bond remains one of the most significant challenges in oxidation. Of key importance is the use of oxygen as the oxidant, but in many cases mor…
Discovery of a chemically stable, light absorbing and low resistivity metal oxide with band edges aligned to the water redox potentials has been a goal of physical scientists for the past forty years. Despite an immense amount of effort, no solution has been uncovered. We present a combined theoretical and experimenta…
Surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-MS) indicated AgBr2-, which adsorbed on gold nanorod surfaces, was a key material to control the anisotropic growth of gold nanorods.