Materials Literature
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We consider the non-equilibrium dynamics of a molecular level interacting with local phonon modes in the case of a strong polaronic shift which prevents a perturbative treatment of the problem. Instead, we find that in an adiabatic regime when the electronic states react faster than the phonon modes it is possible to…
Matrix-assisted formation of ferrihydrite, an iron oxide hydroxide analogue of the protein ferritin-core, in a sol-gel derived organic-inorganic hybrid is reported. The hybrid network (named di-ureasil) is composed of poly(oxyethylene) chains of different average polymer molecular weights grafted to siloxane domains b…
Poly(methyl methacrylate)s (PMMA) containing both tethered and untethered polyhedral oligomeric silsesquioxanes (POSS) were examined through the use of wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and rheological characterization. The presence of tethered-POSS in entangled copolymers l…
Abstract Polymer coatings with features of differing hydrophilicity, mobility, and topography, distributed across a substrate in microscopic and nanoscopic patches were designed as complex materials equipped with sufficient variability in composition, structure, and dynamics to inhibit interactions associated with bio…
The conducting polymer polypyrrole (PPy) was electrochemically grown on hydrogel scaffolds deposited on the surface of microfabricated neural prosthetic devices. It is shown that the pyrrole monomer can be grown vertically through the hydrogel layer up to the surface without affecting the adjacent sites on the probes.…
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Recent experiments indicate that proton irradiation triggers ferromagnetism in originally nonmagnetic graphite samples while He ion bombardment has a much smaller effect. To understand the origin of irradiation-induced magnetism, we have performed spin-polarized density functional theory calculations of the magnetic p…
By coupling two nonlinear one dimensional lattices, we demonstrate a thermal diode model that works in a wide range of system parameters. We provide numerical and analytical evidence for the underlying mechanism which allows heat flux in one direction while the system acts like an insulator when the temperature gradie…
The combination of porous ultra low k dielectric and copper metallization is an attractive alternative to meet the requirements of ITRS roadmap concerning the 65 nm interconnection technology, but very little is known about the reliability of such an approach. Porous materials are usually unstable and sensitive to moi…
Abstract Sc 3 (Sc 0, 31 Al 0, 69 )O 6 wurde als farbloses Pulver sowohl über eine Festkörperreaktion aus den binären Oxiden und auch phasenrein über die Sol‐Gel‐Methode hergestellt. Durch die Kombination von Röntgen‐Pulverdiffraktometrie, Elektronen‐Einkristallbeugung und energiedispersiver Röntgenspektroskopie wurde…
This paper presents two circuit implementations for the differential capacitance read scheme (DCRS) in ferroelectric random-access memories (FeRAM). Compared to the conventional read scheme, DCRS achieves a faster read access by activating the sense amplifiers immediately after a wordline is activated. By relying on t…
Abstract Der Eisen‐Sauerstoff‐Alkoxy‐Cluster [Fe 9 O 3 (OC 2 H 5 ) 21 ]·C 2 H 5 OH kann unter unterschiedlichen Bedingungen zu Molekülen umgesetzt werden, denen alle die allgemeine Formel [Fe 5 O(OR) 8 (OR′) 5 ] gemeinsam ist. Erwärmt man [Fe 9 O 3 (OC 2 H 5 ) 21 ]·C 2 H 5 OH in Toluol, so entsteht [Fe 5 O(OC 2 H 5 )…
Electromigration in copper damascene interconnects is usually associated with interfacial diffusion at the copper/ dielectric barrier interface. In this study, we demonstrate how impurity and microstructural properties of the bulk copper can influence failures at the copper/dielectric barrier interface. Impurity conce…
Abstract The structural and magnetic properties of the double perovskite LaCaMnNbO 6 have been investigated using neutron powder diffraction and SQUID magnetometry. LaCaMnNbO 6 has a monoclinic P 2 1 / n superstructure ( a = 5.5929(1) Å, b = 5.7406(1) Å, c = 7.9824(1) Å and β = 89.897(1)°) with an almost fully ordered…
Novel assembled films of monolayer-protected clusters (MPCs) can be grown on gold and glass substrates with a 20-fold higher efficiency than established procedures. Thick MPC films grown using this new method, which can easily be scaled up or automated, are extremely stable and have properties identical to traditional…
Optical spectra of CdS nanocrystals are interpreted by using both the atomistic tight-binding method and multiband effective mass theory. Both methods correctly describe the energy splitting between the two lowest optically active transitions and their relative strengths, providing the same labeling of the two main ab…
Abstract The compounds In 5 Ch 5 X (Ch = S, Se; X = Cl, Br) represent new mixed valence solids with indium occurring simultaneously in three different oxidation states: In + , In 3+ and In 2+ where the latter appears as covalently bonded dumbbells (In 2 ) 4+ . Although the ionic formulation ( In 5 Ch 5 X = In + 2In 3+…
A sprinkle multiwall-carbon nanotubes, adding into the system of epoxy resin (EP), can bring the resin system to semiconducting state. Adding such kind of carbon nanotubes in the Ag/EP system which the content of conducting particle is below the threshold, can ameliorate its conducting capacity. 0.4wt.% of carbon nano…
A new type of volume holographic gratings based on polymer-liquid crystal composite named POLIPHEM (POlymer LIquid Crystal Polymer Holograms Electrically Manageable) is presented. The new composite material in combination with the proper holographic fabrication results in switchable holographic gratings with high diff…
Silica filled epoxy resins as encapsulation in chip packages reveal a major influence on the reliability and functionality of microelectronic devices. In this study, the resulting effects of postmold curing (PMC) on the thermomechanical and chemical properties of different mold compounds were observed. Polymer systems…