Materials Literature
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Comment on "Fe valency-induced effect on the magnetic and electrotransport properties in Nd$_{0.67}$Sr$_{0.33}$Mn$_{1-x}$Fe$_x$O$_3$ polycrystalline system" [Appl. Phys. Lett. 82, 1721 (2003)]
Low dielectric loss in conjunction with high tunability are simultaneous requirements for tunable device applications which have proved problematic to achieve. In this work, material compositional design and optimized film processing methods were employed to simultaneously lower the dielectric loss and enhance the die…
The interaction between carbon nanotubes and organic molecules including benzene (C6H6), cyclohexane (C6H12), and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ: C8N2O2Cl2) have been studied using first principles calculations. The equilibrium tube-molecule distance, adsorption energy, and charge transfer are obtained…
We studied the adsorption of single atoms on a semiconducting and metallic single-wall carbon nanotube from first principles for a large number of foreign atoms. The stable adsorption sites, binding energy, and the resulting electronic properties are analyzed. The character of the bonding and associated physical prope…
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A bottleneck limiting the widespread application of semiconductor nanocrystal solids is their poor conductivity. We report that the conductivity of thin films of n-type CdSe nanocrystals increases by many orders of magnitude as the occupation of the first two electronic shells, 1Se and 1Pe, increases, either by potass…
We report transmission electron microscope observations that provide evidence of deformation twinning in plastically deformed nanocrystalline aluminum. The presence of these twins is directly related to the nanocrystalline structure, because they are not observed in coarse-grained pure aluminum. We propose a dislocati…
A very effective and simple way to produce silver colloids for surface-enhanced Raman scattering (SERS) is reported. Reduction of silver nitrate with hydroxylamine hydrochloride at alkaline pH and at room temperature yields highly sensitive SERS colloids within a short time. The so-produced colloids can be used for SE…
The ever increasing requirements for electrical performance of on-chip wiring has driven three major technological advances in recent years. First, copper has replaced Aluminum as the new interconnect metal of choice, forcing also the introduction of damascene processing. Second, alternatives for SiO2 with a lower die…
We report the fabrication of transparent field-effect transistors using a single-crystalline thin-film transparent oxide semiconductor, InGaO3(ZnO)5, as an electron channel and amorphous hafnium oxide as a gate insulator. The device exhibits an on-to-off current ratio of approximately 106 and a field-effect mobility o…
Selbstorganisation auf drei verschiedenen Ebenen zeigen Schichten eines Blockcopolymers aus Styrol und Oligothiophen-substituiertem Isopren. Auf dem TEM-Bild des Querschnitts einer solchen Schicht sieht man, wie sich eine Nanostruktur bestehend aus π-konjugierten Oligothiophen-Molekülen an der Phasengrenze senkrecht z…
In situ FTIR measurements of functional group ionization are reported for polyelectrolyte multilayer thin films, composed of a weak polycarboxylic acid and one of several polycations each having different charge densities. The stability of the multilayers in salt solutions increased dramatically when the pH of the sol…
The respective affinities of various imidazole derivatives, imidazole (ImH), 2-methylimidazole (2-MeImH), 2-phenylimidazole (2-PhImH), N-methylimidazole (N-MeIm), 2-methylbenzimidazole (2-MeBzImH), and 4,5-dimethylbenzimidazole (4,5-Me(2)BzImH), for two phenanthroline (Phen) strapped zinc(II) porphyrin receptors porph…
We have studied low-frequency resistance fluctuations (noise) in a single crystal of the rare-earth perovskite manganite ${\mathrm{Pr}}_{0.63}{\mathrm{Ca}}_{0.37}{\mathrm{MnO}}_{3},$ which shows a charge-ordering transition at a temperature ${T}_{\mathrm{CO}}\ensuremath{\approx}245\mathrm{K}.$ The measurements were ma…
The electronic conductivity of PbS and CdTe nanoparticle monolayers was examined voltammetrically by using interdigitated array (IDA) electrodes at the air|water interface. Their band gap energies were estimated from the I − V responses and were very consistent with results obtained from optical measurements as well a…
A new series of morphologically stable, glassy chiral-nematic liquid crystals were synthesized following three distinct deterministic approaches. A glass transition temperature from 67 to 82 °C and a clearing temperature from 175 to 225 °C were accomplished. A helical pitch length from 188 to 210 nm emerged with enant…
A new molecular thermodynamic model is developed of the glass transition temperatures ( T g ) of binary polymer−salt complexes by combining configurational entropy theory with Guggenheim's form of the Debye−Hückel theory. The interactions between the polymer chains and the salt as well as those between cations and ani…
Bistabile molekulare Shuttles, in denen sich ein Makrocyclus über eine vergleichsweise große Strecke (1.5 nm) zwischen zwei Positionen hin- und herbewegt, können durch Licht- oder Wärmeenergie angetrieben werden, vorausgesetzt ΔG zwischen den beiden Zuständen ist hinreichend groß (siehe Bild). Im Beispiel führt die de…
Abstract Polyethylene (PE)‐layered vermiculite (VMT) nanocomposites were fabricated via direct melt compounding in a twin‐screw extruder followed by injection molding. Exfoliated PE/VMT nanocomposites were readily prepared via in situ melt mixing of maleic anhydride modified VMT with PE. Maleic anhydride acts as eithe…
The [ME(8)](n)()(-) ions where M = Cr, Mo; E = As, Sb; n = 2, 3 have been prepared from the corresponding E(7)(3)(-) Zintl ions and M(naphthalene)(2) precursors. The complexes and their [A(crypt)](+) salts (A = Na, K) are formed in 20-45% crystalline yields and have been characterized by UV-vis spectroscopy, EPR, cycl…