Materials Literature
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Multiphoton absorption-induced photoluminescence and amplified spontaneous emission (ASE) have been observed from ZnO nanorod arrays upon near-infrared excitation (λexc∼800nm). A low threshold of ∼12mJ∕cm2 was demonstrated for the ASE process. The ultraviolet emission can be attributed to the recombination of carriers…
High brightness zinc oxide quantum dots were made with intentional alkali metal doping using quantum-confined atom model. The tuning of emission spectrum in the range of 480–562nm was achieved by dispersing them in solvents with varying index of refraction. The observed emission bands are quite distinct from the nonst…
The interface engineering of dibenzotetrathiafulvalene organic thin-film transistors (OTFTs) is reported. Polycrystalline-film morphologies are successfully controlled by surface treatments of silicon dioxide dielectric substrates using hexamethyldisilazane, a silane coupling agent, to tune the average lateral grain s…
The authors report the room-temperature ferromagnetism in the epitaxial thin films of 3% Co-doped Ba0.5Sr0.5TiO3 (CBSTO) grown by pulsed laser deposition. These films show the single phase character with Co dopants in the +2 state. More interestingly, ferromagnetic and ferroelectric transitions were observed at 570 an…
We derive the macroscopic Fourier's Law of heat conduction from the exact gain-loss time convolutionless quantum master equation under three assumptions for the interaction kernel. To second order in the interaction, we show that the first two assumptions are natural results of the long time limit. The third assumptio…
The magnetic behavior of titanium dioxide nanobelts has been investigated with and without Co doping. Room temperature ferromagnetism was observed when the Co-doped anatase TiO2 nanobelts were prepared via vacuum annealing of 2.5at.% Co-doped titanate nanobelts, while annealing them in air resulted in paramagnetic ord…
Structural degradation of nanocrystalline ZnO films was observed with an increase in films thickness. Nanocrystalline epitaxial thin film with thickness of ∼170nm changed to polycrystalline ∼900nm with an increase in deposition time. Surface morphology revealed an average grain size of 30–50nm. Spatial correlation mod…
Abstract The self‐assembly of a metallo‐supramolecular PS‐[Ru]‐PEO block copolymer, where ‐[Ru]‐ is a bis ‐2,2′:6′,2″‐terpyridine‐ruthenium(II) complex, in thin films was investigated. Metallo‐supramolecular copolymers exhibit a different behavior as compared to their covalent counterparts. The presence of the charged…
Adaptive and amphiphilic poly(N,N-dimethylamino-2-ethyl methacrylate-graft-poly[epsilon-caprolactone]) co-networks (netP(DMAEMA-g-PCL)) were synthesized from a combination of controlled polymerization techniques. Firstly, PCL cross-linkers were produced by ring-opening polymerization (ROP) of epsilon-CL initiated by 1…
We report the effects of gate bias sweep rate on the electronic characteristics of ZnO nanowire field-effect transistors (FETs) under different environments. As the device was swept at slower gate bias sweep rates, the current decreased and threshold voltage shifted to a positive gate bias direction. These phenomena a…
Adsorbed or grafted polymers are often used to provide steric stabilization of colloidal particles. When the particle size approaches the nanoscale, the curvature of the particles becomes relevant. To investigate this effect for the case of cylindrical symmetry, I use a classical fluids density functional theory appli…
The magnetostatic interactions between carbon nanotubes filled with magnetic particles have been experimentally and theoretically studied. By making nanotubes uniformly magnetized, one eliminates the attraction caused by periodicity of nanoparticles in magnetic chains. The discreteness of individual nanoparticles in t…
Meisenheimer complexes are important intermediates in Nucleophilic Aromatic Substitution Reactions (S(N)Ar). They are formed by the addition of electron rich species to polynitro aromatic compounds or aromatic compounds with strong electron withdrawing groups. It is possible to distinguish two types of Meisenheimer or…
Novel photolabile protecting groups based on the 2-(2-nitrophenyl)propoxycarbonyl (NPPOC) group with a covalently linked thioxanthone as an intramolecular triplet sensitizer exhibit significantly enhanced light sensitivity under continuous illumination. Herein we present a detailed study of the photokinetics and photo…
Using lipids (N-acyl amino acids) and 3-aminopropyltriethoxysilane as structure- and co-structure-directing agents, mesoporous silicas with four different morphologies, that is, helical ribbon (HR), hollow sphere, circular disk, and helical hexagonal rod, were synthesized just by changing the synthesis temperature fro…
Abstract BACKGROUND: Microencapsulation technology promises new applications such as intelligent microstructures, phase change materials and self‐healing composites. Microcapsule synthesis and characterization have been researched extensively; however, the well‐known polymerization between epoxy resins and carboxylic…
Scratching the surface: Atomic force microscopy has been utilized to study the surface of zeolite L (see AFM image of the hexgonal face of a crystal). Correlations between nanometer high features and the structural units have been determined, with the smallest unit protruding from the surface corresponding to a single…
Abstract Alternating copolymers of glycolic (G) and lactic (L) acid were prepared by the condensation of the preformed dimers: L L G and L rac G. By size exclusion chromatography (THF, PS standards), poly(L L G) exhibited a molecular weight ( M n ) of 15.6 kg mol −1 , with a weight average molecular weight ( M w ) of…
The growth of wurtzite ZnO on cubic MgO (001) substrates by molecular beam epitaxy is reported. ZnO epilayers exhibit the nonpolar m-plane orientation based on x-ray diffraction and transmission electron microscopy analysis. Comparative studies of ZnO grown by pulsed laser deposition on MgO (001) result in preferred g…
The influence of carbon on the structural, magnetic, and magnetocaloric properties of LaFe11.2Co0.7Si1.1Cx compounds was investigated. The Curie temperature increases with increasing the carbon content. The maximum magnetic entropy changes under a magnetic field change of 5T are about 14.5, 9.8, and 8.3J∕kgK for x=0.1…