Materials Literature
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High-energy focused proton beam irradiation has been used to controllably blueshift the resonant wavelength of porous silicon microcavities in heavily doped p-type wafers. Irradiation results in an increased resistivity, hence a locally reduced rate of anodization. Irradiated regions are consequently thinner and of a…
We report on the synthesis of La0.7Sr0.3MnO3 (LSMO) nanoparticles having perovskite structure and particle size of the order of 30nm. The process involves citrate-gel synthesis, size filtering, and surface coating with a shell of octadecyl amine (ODA) using electrostatic interaction-assisted novel chemical route. Magn…
The optical extinction spectra of four topologically different Ag nanorod structures, needle, periodic, L, and Y shapes, have been calculated by the discrete dipole approximation. Both the needle and periodic shaped nanorods can be used to effectively tune plasmon resonant peaks, while the L- and Y-shaped nanorods inf…
Despite very encouraging progress in recent years, phase change random access memory (ovonic unified memory, OUM) still faces several problems, such as reliability (lifetime), power consumption and speed, which need to be resolved before it can be commercialized. There have been a number of attempts to address such pr…
We demonstrate the use of nanoimprint lithography as an alternative low-cost fabrication route for the production of ordered arrays of individual carbon nanotube field emitters. A high emission site density of 4×105cm−2 was observed and is well within the specification of the cathode for a field emission display. The…
A polarization-independent phase modulator using a 90° twisted dual-frequency liquid crystal (DFLC) is demonstrated. In addition to being polarization independent, such a phase modulator exhibits many other advantages such as being scattering-free and having large phase change, low operating voltage, and submillisecon…
We have prepared Co-doped ZnO bulks with a two-step method. The bulk samples are sintered at the temperature above 1000°C to get pure single phase and then treated by Zn vapor in a vacuum. Based on such two-step preparation, clear carrier induced ferromagnetism is found in Zn treated Co-doped ZnO bulks, which suggests…
Current theories regarding the molecular mechanisms that provide protein adsorption resistance primarily focus on the characteristics of various types of surface-tethered chains and their interactions with water but often neglect their interactions with the protein. Such theories thus do not provide a complete explana…
In this paper we present the details of a new technique, which allows for spatially-resolved imaging of microprocessor power (SIMP) under full operational conditions. The method involves two steps: In the first step it utilizes infra-red (IR) thermal imaging, while an IR-transparent coolant flows through a specially d…
The pressure-induced structural phase transition of MgH 2 was examined up to 57 GPa at room temperature. α-MgH 2 with the rutile-type structure at ambient conditions transformed to γ-MgH 2 with the α-PbO 2 structure. A complete conversion to the γ-phase, however, did not take place and these two phases coexisted up to…
In this letter, we report on dielectric and leakage current characteristics of room temperature deposited Bi1.5Zn1.0Nb1.5O7 (BZN) films on the basis of crystallographic structure and suitability of BZN gate insulators as key building blocks in the fabrication of low voltage operating ZnO based thin-film transistors (T…
The cooling of high power components in notebook computers is uniquely challenging due to space constraints that limit the size of the thermal solution. As a result, for some applications, a method of inserting a "negative" thermal resistance into the heat flow path may be required in order to achieve higher component…
CdSe quantum rods are prepared at much milder conditions than previously reported, using noble-metal seed particles to initiate growth. The CdSe nanocrystals initially form as multipods that cleave to yield freestanding quantum rods (see figure) with high photoluminescence quantum yields. This study provides a new dir…
Initiated chemical vapor deposition enables an all-dry encapsulation of fine particles down to the nanoscale by functional polymers. Initiator vapor is first thermally activated to form primary radicals, which, together with the monomer vapor, are adsorbed onto the particle surface where free-radical polymerization cr…
Abstract Summary: Due to a large difference in storage modulus below and above the glass transition temperature, a novel shape‐memory poly[(methyl methacrylate)‐ co ‐( N ‐vinyl‐2‐pyrrolidone)]/poly(ethylene glycol) semi‐interpenetrating polymer networks structure was synthesized, which is stabilized by hydrogen‐bondin…
Transverse-periodic-oriented nematic liquid crystals (LCs) are a special type of optical axis grating that are capable of very high efficiency diffraction (theoretically, 100%) in thin layers of materials with thickness comparable to the radiation wavelength. In particular, they fully diffract linearly polarized input…
A dipolar-free sum-over-states expression for the diagonal components of the first hyperpolarizability (beta) tensor has been proposed by Kuzyk [Phys. Rev. A 72, 053819 (2005)] as an alternative to the traditional expression. We examine both alternatives for the longitudinal beta of four typical push-pull pi-conjugate…
Observation of high temperature ferromagnetism in Ni-doped In2O3 and indium-tin-oxide (ITO) samples prepared by a solid state synthesis route is reported. Both Ni-doped compounds showed a clear ferromagnetism above 300K with the magnetic moments of 0.03–0.06μB∕Ni and 0.1μB∕Ni at 300 and 10K, respectively. Ni-doped In2…
Self-assembled ZnO quantum dots (QDs) were achieved by a vapor phase transport process. ZnO nanodots were naturally formed on solid substrates in the Volmer-Weber growth mode. Size control of nanodots could be readily realized by varying the growth time. The as-prepared ZnO QDs are of high quality and very stable afte…
Application of the supramolecular-synthesis strategy ionic self-assembly for the facile production of low-molecular-weight photo-addressable materials (see figure) is presented. The materials have good film-forming properties, long-term thermal stability, and, most importantly, dichroic ratios of 50.