Materials Literature
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Ferrocene redox polymers based on the coupling of ferrocenecarboxaldehyde to both linear and branched poly(ethylenimine) (PEI) have been prepared to investigate the effects of pH, electrolyte, and cross-linking on electron charge transport and film swelling. The redox behavior of both ferrocene-modified linear PEI and…
The temperature-induced structural changes of a thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) layer grafted onto a silica substrate were investigated in aqueous solution using an atomic force microscope (AFM) and a quartz crystal microbalance with dissipation (QCM-D). A PNIPAM layer was grafted onto the silic…
We report low frequency tunnel current noise characteristics of an organic monolayer tunnel junction. The measured devices, n-Si/alkyl chain (C18H37)/Al junctions, exhibit a clear 1/ f γ power spectrum noise with 1< γ <1.2. We observe a slight bias-dependent background of the normalized current noise power spectrum (S…
Nanodiamond crystals containing single color centers have been grown by chemical vapor deposition (CVD). The fluorescence from individual crystallites was directly correlated with crystallite size using a combined atomic force and scanning confocal fluorescence microscope. Under the conditions employed, the optimal si…
Nanowires of one-dimensional manganese oxide (cryptomelane) have been synthesized using reaction between Mn II (MnSO 4 ) and Mn VII (KMnO 4 ) in water by a low-temperature route at 60 °C and 95 °C. Characterization of the nanoparticles was carried out using powder X-ray diffraction, transmission electron microscopy, e…
We report the destabilization of the charge ordered insulating (COI) state in a localized region of Pr_0.63Ca_0.37MnO_3 single crystal by current injection using a scanning tunneling microscope tip. This leads to controlled phase separation and formation of localized metallic nanoislands in the COI matrix which have b…
The crown ether-linked iridium(III) complex [Ir(ppy)2 (di-aza-phen)]+ (1) {ppy = 2-phenylpyridine and di-aza-phen = 4,7-di(1,4-dioxa-7,13-dithia-10-azacyclopenta-dec-10-yl)-1,10-phenanthroline (7)} has been prepared. Compound 1 exhibits a notable luminescence enhancement in the presence of Ag+ in aqueous media. The an…
Here we compare the change in conductance when molecules wired between the ends of individual single-walled carbon nanotubes are switched between different states of conjugation. Our experimental approach utilizes electrodes made by excising a nanoscale section from an individual single-walled carbon nanotube. We use…
Limiting currents under mass transport limiting conditions were determined experimentally for two distinct types of electrochemical plating cells using voltammetric and chronoamperometric methods. The average limiting currents were used to estimate the thickness of the diffusion boundary layer that results from the no…
Ba 0.7 Sr 0.3 TiO 3 (BST) thin films have been deposited onto (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 (LSAT) single-crystal substrates by pulsed laser ablation. X-ray diffraction revealed that the BST thin films were well crystallized and epitaxially grown on the substrates with a distorted crystal structure comparing with…
Pt nanoparticles with controlled shapes and sizes would be useful for fundamental researches on the catalytic activity for oxygen reduction reaction. In the present study, cubic Pt nanoparticles were prepared from a solution of K2PtCl4 in the presence of polyacrylic acid (PAA) as a capping reagent. The effect of tempe…
Ge2Sb2Te5 (GST), the key phase change material in PRAM (Phase-change Random Access Memory) is accompanied by volume- and stress-changes during its crystallization. This suggests that the changes may induce reliability issues of PRAM. In this work, the stress is reduced by half by capping GST with Al2O3 film. To mainta…
Abstract Boron nitride coatings on high‐surface area MgAl 2 O 4 and Al 2 O 3 have been synthesized and characterized by transmission electron microscopy and by X‐ray powder diffraction. The metal oxide templates were coated with boron nitride using a simple nitridation in a flow of ammonia starting from ammonium borat…
This manuscript introduces a new technique for depositing materials at controlled depths within porous substrates. This technique uses the passivating effect produced by one ALD precursor to prevent the adsorption of a second ALD precursor. For example, a surface exposed to trimethyl aluminum is not reactive towards d…
Delamination is one of the main failure mechanisms in bonded composite joints. Owing to a considerable spatial scatter in adhesion over the interface in such joints, initiation of a delamination zone and propagation of its front are highly random processes. The main delamination front is rather tortuous, and many smal…
The present study reports the influence of the Pt/Ti sputtering temperature on the orientation and microstructure of the Pt/Ti films and PZT films. The Pt/Ti film sputtered at 200°C shows the highest Pt(111) peak intensity among the Pt/Ti films sputtered between room temperature to 600°C. The PZT films deposited lower…
Modeling of pit chemistry in applied polarization mode is carried out using analytical calculations. The results lead to the formulation of critical conditions for pit stabilization. More detailed computing is performed to study pit stability behavior in terms of pit geometry and applied potential. The results fairly…
Abstract Poly(ethylene terephthalate) (PET) nanocomposites with a newly synthesized organomica (C 16 BIMD‐Mica) were obtained by using the in situ interlayer polycondensation of ethylene glycol with dimethylterephthalic acid. The PET hybrids were melt‐spun to produce monofilaments with various organoclay contents and…
Abstract High impact polystyrene was synthesized using two series of styrene/butadiene (SB) tapered block copolymers with a polystyrene (PS)/polybutadiene (PB) composition of 30/70 and 10/90 wt%. During the synthesis, concentration of initiator, SB and transfer agent were varied. From dynamic mechanical analysis, the…
A discussion is presented of the understanding of localised corrosion which can be gained using simple electrochemical measurements. The discussion centres around the origins of pitting corrosion and its development from a minute site which undergoes dramatic depassivation through rapid dissolution to stable pitting.