Materials Literature
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In this study, a two-step annealing method is advanced to produce high-quality ZnO films with excellent structural, electrical, and optical properties. The effects of oxygen and nitrogen annealing on the properties of undoped ZnO films are reversible to each other and are attributed to the creation and annihilation of…
We perform for the first time photoluminescence excitation (PLE) studies of individual nanocrystals (NCs) that reveal the structure of excited-state transitions not obscured by ensemble averaging. Single-NC PLE spectra strongly deviate from a traditional idealized picture of sharp, quasiatomic resonances. We detect on…
Some solid compounds can exist in two or more polymorphs with different atomic structures but the same chemical composition. Similar behavior has been observed for glasses and liquids, where the phenomenon is termed polyamorphism. In their Perspective, Yarger and Wolf highlight the reports by Katayama et al. and Tanak…
To reexamine the established "auxiliary donor" effect of thiophene in nonlinear optical (NLO) chromophores, we have prepared two isomeric donor-acceptor azo dyes, differing only in the position of the thiophene. Experimental analysis of these chromophores, including electric field-induced second harmonic generation (E…
We report the synthesis and spectral characterization of the first five members of an oligomeric series built from alternating p-connected 1,4-benzene and 1,4-pyridinium rings, 1[n]-4[n], n=1-5, with p-phenylene-bis-4,4'-(1-aryl-2,6-diphenylpyridinium) ("extended viologen") as the repeating unit. The lengths of these…
V 2 O 5 thin films were produced by pulsed laser deposition (PLD) over a wide temperature range, 30–500 °C. The effects of temperature and structural characteristics of the substrate on the growth, surface morphology, and local atomic structure of V2O5 films were probed with atomic force microscopy (AFM) and Raman spe…
Cobalt-doped ZnO (Zn1−xCoxO) thin films were fabricated by reactive magnetron cosputtering. The processing conditions were carefully designed to avoid the occurrence of Co precipitations. The films are c-axis oriented, and the solubility limit of Co in ZnO is less than 17%, determined by x-ray diffraction. X-ray photo…
A synergistic approach combining the experimental photoelectron spectroscopy and theoretical electronic structure studies is used to demonstrate the existence of magnetic isomers as well as configurations having comparable binding energies, identical spins, and yet differing in the distribution of local moments (calle…
The effect of Cr doping on the charge-ordered (CO) state of the bilayered manganite LaSr2Mn2O is investigated by electronic transport and magnetic property measurements. With Cr doping, the metal-insulator transition disappears and the temperature dependence of resistivity ρ(T) exhibits semiconducting behavior. Both t…
Abstract The low‐temperature heat capacity of poly(butylene terephthalate) (PBT) was measured from 5 to 330 K. The experimental heat capacity of solid PBT, below the glass transition, was linked to its approximate group and skeletal vibrational spectrum. The 21 skeletal vibrations were estimated with a general Tarasov…
We have designed and modeled new techniques, based on the 3ω method, to measure thermal conductivity of liquids (κl) and solids (κs) under hydrostatic pressure (P). The system involves a solid sample immersed in a liquid pressure medium, both of which have unknown thermal properties. The temperature (T) and P dependan…
Two different vacuum tight sample cells for in situ temperature dependent small angle scattering from liquids are presented in this article. In the first one, the sample fills a 1 mm thickness gap sealed on both sides by two thin parallel mica windows (volume 300 μl). In the second one, the liquid is injected into a 1…
A unique, simple, inexpensive, and one-step synthesis route to produce carbon nanotubes (CNTs) decorated with palladium nanoparticles using a simplified dc arc-discharge in solution is reported. Zero-loss energy filtered transmission electron microscopy and scanning transmission electron microscopy confirm the presenc…
The quenching mechanism of the emission from the P03 level of Pr3+ doped into YVO4 has been investigated by means of optical spectroscopy techniques. Continuous wave and time-resolved emission and excitation measurements have been carried out as a function of the temperature and of the dopant concentration in order to…
We report the magnetization, specific heat, and transport measurements of a high quality ${\mathrm{N}\mathrm{a}}_{0.85}{\mathrm{C}\mathrm{o}\mathrm{O}}_{2}$ single crystal in applied magnetic fields up to 14 T. At high temperatures, the system is in a paramagnetic phase. It undergoes a magnetic phase transition below…
A novel and efficient method is reported for the preparation of phthalocyanines from phthalonitrile or its derivatives which utilizes low-cost reagents of hydrolytic stability, high simplicity, and easy accessibility, i.e., oximes, and proceeds via an unprecedented double addition of oximes to the nitrile group.
Surface-grafted styrene-based homopolymer and diblock copolymer brushes bearing semifluorinated alkyl side groups were synthesized by nitroxide-mediated controlled radical polymerization on planar silicon oxide surfaces. The polymer brushes were characterized by X-ray photoelectron spectroscopy (XPS), near-edge X-ray…
Quantum chemical calculations predict the existence of new molecular species with general formula MH12, where M is a group 6 atom. The previous MHn species had n values up to 9. The new systems with n = 12 would be a new record for metal hydrides.
Abstract The processing of nanocomposite materials composed of amine‐cured diglycidyl ether of bisphenol A (DGEBA) reinforced with organomontmorillonite clay is reported. A novel sample preparation scheme was used to process the modified clay in the glassy epoxy network, resulting in nanocomposites where the clay was…
We present experimental measurements at microwave frequencies of a double band left-handed metamaterial. The sample of metamaterial is composed of an extended version of the S-shaped resonators that exhibit simultaneously a negative permittivity and a negative permeability response at comparable frequencies. The exper…