Materials Literature
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Ammonia borane (AB) is under significant investigation as a possible hydrogen storage material. While chemical additives have been shown to lower the temperature for hydrogen release from ammonia borane, many provide additional complications in the regeneration cycle. Mechanically alloyed hexagonal boron nitride (nano…
Magnetic behavior of SnO2 nanosheets has been investigated both experimentally and theoretically. It is found that SnO2 nanosheets with a thickness of 1.5–13 nm show ferromagnetic state at ambient temperature. First-principles calculations reveal that oxygen atoms at O-terminated surface in SnO2 sheet are spin polariz…
Einen ganz einfachen Weg zu Metallnanokristallen eröffnet die Verwendung von Kohlenmonoxid als Reduktionsmittel. Hoch monodisperse Platin-Nanowürfel, sphärische Palladium-Nanokristalle und ultradünne Gold-Nanodrähte können innerhalb von 15 Minuten erzeugt werden.
Abstract The spectroscopic properties of photochromic ruthenium sulfoxide complexes are reviewed. The mode of action is associated with an excited state S→O isomerization triggered by light. These complexes feature large, positive Ru 3+/2+ reduction potentials indicative of stabilization of the Ru dπ orbital set. In a…
Abstract Time–temperature–transformation (TTT) diagrams are proposed for the crystallization of amorphous metal oxide thin films and their specific characteristics are discussed in comparison to glass‐based materials, such as glass‐ceramics and metallic glasses. The films crystallize from amorphous to full crystallini…
Polymer-based solar cells consisting of ZnO nanorods and poly(1-methoxy-4-(2-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) are investigated by current−voltage characterization and intensity modulated photovoltage spectroscopy (IMVS). The high quality ZnO nanorod arrays were prepared by electrodeposition, in which th…
Aggregates of reaction intermediates form during the early stages of aniline oxidative polymerization whenever the initial mole ratio of proton concentration to aniline monomer concentration is low ([H(+)](0)/[An](0) <or= 1.0). Detailed characterization is carried out on those aggregates. The intermediate aggregates s…
Using spin-polarized density functional theory calculations, we demonstrate that hybrid BN–C nanotubes (BN-CNTs) have diverse electronic and magnetic properties depending on their percentage of carbon and BN components. Typically, a BN-CNT is converted from a nonmagnetic semiconductor to a spin-polarized metal and the…
Segmented polylactide (PLA) core−shell molecular brushes, where the shell layer was located only in the middle part of the bottlebrush, were synthesized and converted to organic nanotubes with controlled dimensions and open ends. Segmented bottlebrush copolymer precursors were prepared from a triblock copolymer backbo…
The preparation of a novel covalently bonded luminescent hybrid material and its spectrophotometric anion sensing property were reported. The fluorescent receptor (lanthanide complex) was embedded in mesoporous silica through a sol−gel approach, and the nanoscale rod material exhibited excellent photophysical properti…
Abstract Nanostructured metal films have been widely studied for their roles in sensing, catalysis, and energy storage. In this work, the synthesis of compositionally controlled and nanostructured Pt/Ir films by atomic layer deposition (ALD) into porous anodized aluminum oxide templates is demonstrated. Templated ALD…
Abstract This article provides a brief overview of functional mesoporous silica materials synthesized by the co‐structure‐directing route, which is distinct from conventional synthesis strategies. In these systems, organosilane serves as the co‐structure‐directing agent (CSDA), which provides critical interactions bet…
We report that the graphene sheets can be stably dispersed in water by hydrophobic interaction with polyacrylamide. Most interestingly, the resultant graphene-polyacrylamide complexes show a reversible pH responsive property although polyacrylamide itself does not possess such characteristics. This method opens up nov…
The NaAlH 4 system remains the archetype of hydrogen storage solids. However, the detailed mechanisms of the hydrogen reactions of NaAlH 4 remain unknown. We report 27 Al in situ nuclear magnetic resonance (NMR) spectroscopic data revealing an Al-bearing mobile species that could provide the large scale metal-atom tra…
Abstract Blue luminescent hybrid materials (DDS–AQS( x %)/LDH) are successfully prepared by co‐intercalating tris(8‐hydroxyquinoline‐5‐sulfonate)aluminum anions (AQS 3− ) and dodecyl sulfonate (DDS − ) with different molar ratios into Mg–Al layered double hydroxides (LDHs) by the hydrothermal and solution co‐precipita…
Efficient charge transport is demonstrated in TiO2/PbS quantum dot solar cells where the PbS absorber (∼1.1 eV band gap) is deposited by dip coating and ethanedithiol ligand exchange, with power efficiencies above 3% at AM1.5. An increase in power efficiency occurs as the device temperature is lowered to 170 K, with a…
We investigated the physical properties of antiperovskite compound SnCFe3 by comprehensive magnetic measurements. The strong irreversibility is clearly observed from zero-field-cooled and field-cooled magnetizations. The peaks of ac susceptibility display strong dependences on the frequency and magnetic field. Both th…
The paper reports on covalent linking of different alkyne-containing (decyne, ethynylferrocene, and N-propargyl-1-pyrenecarboxamide) compounds to azide-terminated nanodiamond (ND) particles. Azide-terminated particles (ND-N(3)) were obtained from amine-terminated nanodiamond particles (ND-NH(2)) through the reaction w…
Interfacial charge-transfer emission in molecule−TiO 2 semiconductor nanoparticles has been followed with femtosecond fluorescence upconversion in an attempt to characterize the localized/delocalized nature of the charge-transfer excitation. Ligand to metal charge-transfer absorption is observed in catechol, dopamine,…
Multiferroic nanocomposite films, composed of well-dispersed, magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 (NZFO) nanoparticles (in the size range 10−20 nm) embedded into a poly(vinylidene-fluoride) copolymer matrix host, have been prepared by a modified polymer processing route. The dielectric, ferroelectric, ferromagnetic and ma…