Materials Literature
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Dyes inserted into the parallel nanochannels of a fully organic crystal show efficient light conversion over a wide visible spectral region, with 100 % conversion from UV to blue light. The Figure shows crystals containing either two (bottom) or three (top) dyes under UV illumination, and a top view of the structure o…
Quantum tunneling of the magnetization in a single molecule magnet has been studied in experiments that combine microwave spectroscopy with high sensitivity magnetic measurements. By monitoring spin-state populations in the presence of microwave radiation, the energy splittings between low lying superpositions of high…
Thermoelectric refrigeration has been studied for use in electronics cooling applications. Because of their low efficiency, a significant amount of additional heat is produced that must be removed from the device by passive means. However, even well-designed passive heat removal systems are faced with physical limitat…
To find its practical use in ultrahigh density optical data storage, superresolution (SR) technique needs a material that can render a high SR capability at no cost of durability against repeated readout and write. Thermoelectric materials appear to be promising candidates due to their capability of yielding phase-cha…
A technique is presented which allows one to combine TEM investigations with transport measurements and potentially a wide range of other investigations on the same nanoobject. Using this technique, we have obtained high-resolution transmission electron microscopy images and transport investigations including transfer…
We report on the growth of amorphous carbon nitride films (a-CNx) showing the highest conductivity to date. The films were prepared using a layer-by-layer method (a-CNx:LL), by the cyclical nitrogen radical sputtering of a graphite radical, alternated with a brief hydrogen etch. The photosensitivity S of these films i…
The formation and erasure of photoinduced surface relief gratings (SRGs) on azobenzene-containing polymers are simulated using a calculation model based on the moving-particle semi-implicit method. For the convection calculation, an anisotropic diffusion model is proposed. The gradient force of the optical electric fi…
We present a combined experimental and theoretical analysis of the structure of finite-sized Sigma 3 [112] grain boundaries in Au. High-resolution electron microscopy shows lattice translations at the grain boundary, with the magnitude of the translation varying along the finite-sized grain boundaries. The presence of…
The present study experimentally investigates the mechanisms involved in the flow-induced coalescence process for two equal-sized drops (polybutadiene drops suspended in a polydimethylsiloxane matrix), by taking advantage of the capability of the computer-controlled “four-roll mill” to carry out head-on collisions. In…
The domain structure of sintered SmCo5 permanent magnets at the surface perpendicular to the alignment axis was investigated by magnetic force microscopy (MFM). The main domains forming a maze pattern of typically 3–5μm in width and surface reverse spikes of typically 1–2μm in size are observed. This coarse domain str…
The prospects of using thermoelectric coolers (TECs) as a means to enhance heat sink performance and extend the limits of air cooling for electronics has considerable appeal when one considers the alternatives of liquid cooling. Historical analyses of TECs for electronics cooling only considered "off-the-shelf" TECs,…
Novel heat-conduction interfaces that employ carbon nanotube (CNT) arrays have been fabricated and studied experimentally. A reference calorimeter testing rig in a high vacuum environment with infrared temperature measurement has been established. Arrays of mat-type carbon nanotube layers have been grown directly on s…
Porous silicon (PS) can be optically described as a homogeneous mixture of air, silicon, and, eventually, silicon dioxide, which explains the great tunability of its refractive index. This behavior makes porous silicon a very interesting material for the development of interference filters for use in optoelectronic ap…
Oxygen-deficient hexagonal BaTiO3 single crystals, with dielectric constant ε′∼105 and loss component tan δ∼0.13 at room temperature and a linear temperature dependence of ε′ in the range 70–100K, was analyzed by impedance spectroscopy analysis. Two capacitors, bulk and interfacial boundary layer, were observed, and t…
A photoaddressable azobenzene-side-chain polymer (see Figure) optimized to exhibit a large optical birefringence of Δn = 0.5 at 650 nm is described. The birefringence extends well into the telecommunication wavelength region, which, together with the high optical transparency above 650 nm, promises applications for in…
A wurtzite-structured CdSe nanosaw (see Figure) is formed by a two-step process: a fast-growth process along [010] creates the main ribbon, while a subsequent side-growth process along [0001] creates the one-sided teeth. The growth of the teeth is suggested to be a combined result of secondary epitaxial nucleation pro…
Parallel-plate Au(Pt)∕Ba0.25Sr0.75TiO3∕(Pt)Au thin film varactors were fabricated on high resistance Si substrates and characterized at dc, rf, and microwave frequencies. In the frequency range 10–45 GHz the varactors show relatively low losses, with loss tangent less than 0.025 at 45 GHz. Due to the thick and highly…
In this paper we develop a simple model based on a leaky transmission line to assess the electrical performance of transparent current spreading layers for application to surface light emitting diodes. Figures of merit suitable for device design are obtained and these are applied to a range of material systems reporte…
The primary energy dependecne and atomic-number dependence of backscattered electrons in Auger electron spectroscopy in the EN(E) mode have been investigated both theoretically and experimentally. A Monte Carlo simulation method with inclusion of cascade-secondary-electron production has been used to calculate the ful…
Magnetic films containing ordered arrays of holes (“antidots”) with period ∼200nm have been prepared using porous anodic alumina substrates with square and hexagonal symmetries. Large area (∼cm2) single-layer CoFe ordered antidot arrays show well-defined in-plane magnetic anisotropy related to the symmetry of the arra…