Materials Literature
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[reaction: see text] A series of alpha,alpha'-bisdiarylamino-capped oligothiophenes C(n) were prepared by the palladium-catalyzed reaction of the dibromo compounds A(i) with diarylamines, N,N-diarylamino-substituted thiophenes or 2,2'-bithiophenes BX(j). These easily oxidizable compounds exhibit a high tendency to for…
Here we present a spatially directed calcination approach based on masked UV exposure to pattern mesoporous regions within a mesostructured matrix in a rapid, single-step, and inexpensive manner. Subsequent chemical treatment of the film can selectively remove the mesostructured regions, leading to patterned mesoporou…
En este trabajo, se describe el fenómeno de la degradación por corrosión electroquímica de los metales, sus efectos y costos, así como algunas de las técnicas empleadas para minimizar su impacto. Se hace énfasis en la descripción y mecanismo de acción de los inhibidores de corrosión y, con base en lo anterior, se plan…
Abstract The synthesis and characterization of liquid‐crystalline precursor polymer solutions [1] for polyimides permit for the first time the preparation of bulk‐ and surface‐oriented polyimide thin films from the nematic lyotropic state by shear. A special shearing technique was developed and optimized to orient vis…
Spectral and transient photovoltage (PV) phenomena are investigated in hydrogenated and oxidised free standing mesoporous silicon (meso-PS) layers. The size and the surface conditioning were changed systematically. The absorption tails of hydrogenated and oxidised meso-PS have been related to disorder in the bulk nano…
Porous silicon (PS) is characterized by a very large surface that is very reactive with the external environment. In this work, the chemical composition of the internal surface of both freshly anodically formed and electroplated PS with Fe and Co metals was studied. The samples were analyzed by scanning electron micro…
Self organization is a rather common phenomenon during pore formation in III–V semiconductors. The so called tetrahedron-like pores, the domains of crystallographically oriented pores in n-GaAs, or the macroscopic voltage oscillations in n-InP at high constant current densities are examples of a self organization proc…
2,3-Didecyloxyanthracene (DDOA) is able to gel a large variety of organic solvents at very low concentrations by forming a three-dimensional network of fibers. A vibrational assignment is proposed for the midinfrared absorptions of DDOA in the gel and solution states, showing that some out-of-plane vibrations of the a…
We have proposed and evaluated the novel three-dimensional on-chip variable inductor that is fabricated using microelectromechanical systems technology. The variable inductor was made of thin film metallic glass, Pd 76 Cu 7 Si 17 , that has high flexibility. Since the thin film metallic glass has high elasticity, the…
Pore formation in n-type III–V semiconductors will be discussed and compared to pore formation in silicon. While by now many different kinds of pores were produced in silicon, the “pore zoology” in III–Vs was rather limited until recently. This paper will briefly review the specific pore morphologies in some compound…
High quality Mn-doped GaN and AlN films grown by molecular beam epitaxy have been investigated with X-band electron spin resonance (ESR). The observed resonance patterns are well described by the spin Hamiltonian for isolated ${}^{55}{\mathrm{Mn}}^{2+}$ centers with electronic spin $S=5/2$ and nuclear spin $I=5/2.$ Is…
Phosphorus (P)-doped carbon (n-C) films are deposited by pulsed laser deposition technique using a camphoric C target. The activation energy increased to approximately 0.23 eV for the film deposited using a 1% P target compared to undoped C film (0.17 eV), after which it decreases with further increase in P content to…
Although endothelial cell (EC) seeding improves the patency of vascular prostheses, the detachment of adherent ECs after the restoration of circulation remains one of the major obstacles. Polymer surfaces for endothelialization can be optimized. In this study, polyethylene terephthalate (PET), polypropylene (PP), poly…
Abstract Four (BEDT‐TTF) 4 A[M(C 2 O 4 ) 3 ]·DMF (DMF = dimethylformamide) salts of the organic donor molecule bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) with metal oxalate anions, where A = (NH 4 , K), M = Cr ( 1 ); A = NH 4 , M = Fe ( 2 ); A = K, M = Cr ( 3 ); and A = NH 4 , M = Cr ( 3′ ) were prepared by elec…
As a direct metal patterning method, local electrodeposition of Ni onto porous silicon (PS) is studied. The principle of the method in this research utilizes the photo-excitation of semiconductor, in contrast to the previous studies of laser assisted metal deposition, in which the deposition is enhanced by heating eff…
We have investigated hybrid organic-inorganic systems composed of silicon–porous silicon and poly(phenylene vinylene) (PPV) in order to fabricate new light emitting devices, having properties of both materials. The key concern in these systems is the control of the penetration of the polymer into the pores of the semi…
The deposition of nickel (Ni) onto a porous silicon (PS) layer by immersion plating from acidic and alkaline fluoride solutions has been studied. In an immersion plating bath of simple hydrofluoric acid (HF) of pH 2 containing Ni ions, no metal deposition was observed. However, visible metallic Ni was deposited from t…
Porous silicon can be used as separation layers in layer transfer technology where a thin layer of crystalline silicon is separated from a large wafer and transferred onto a cheap foreign substrate. The porous layers are part of the fabrication process and undergo the processing treatment, especially the thermal treat…
We report the temperature dependent cross-plane thermal conductivities of Ge quantum dot superlattices measured by the 3\ensuremath{\omega} method. A large reduction in the thermal conductivity of the superlattices compared with that of bulk materials is observed. A simple model taking into account the relaxation time…
In this paper we study the dynamics of pore coarsening in porous silicon during annealing. We model the sintering of pores with two-dimensional and three-dimensional simulations. We compare our simulations with transmission and scanning electron micrographs of experimentally annealed porous silicon samples. Simulation…