Materials Literature
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Motivated by recent experiments, we have studied transport behavior of coupled quantum dot systems in the Coulomb blockade regime using the master (rate) equation approach. We explore how electron-electron interactions in a donor-acceptor system, resembling weakly coupled quantum dots with varying charging energy, can…
Ultrasmall gadolinium oxide nanoparticles doped with terbium ions were synthesized by the polyol route and characterized as a potentially bifunctional material with both fluorescent and magnetic contrast agent properties. The structural, optical, and magnetic properties of the organic-acid-capped and PEGylated Gd 2 O…
We study the few-electron eigenspectrum of a nanotube quantum dot with spin-orbit coupling. The two-electron phase diagram as a function of the length of the dot and the applied parallel magnetic field shows clear signatures of both spin-orbit coupling and electron-electron interaction. Below a certain critical length…
The origin of the unusual $90\ifmmode^\circ\else\textdegree\fi{}$ ferroelectric/ferroelastic domains, consistently observed in recent studies on mesoscale and nanoscale free-standing single crystals of ${\text{BaTiO}}_{3}$ [Schilling et al., Phys. Rev. B 74, 024115 (2006); Schilling et al., Nano Lett. 7, 3787 (2007)],…
Off-normal low energy ion beam sputtering of solid surfaces often leads to morphological instabilities resulting in the spontaneous formation of ripple structures in nanometer length scales. In the case of Si surfaces at ambient temperature, ripple formation is found to take place normally at lower incident angles wit…
We have investigated the hysteresis of the temperature- and magnetic field--induced martensitic phase transition in ${\text{Ni}}_{50.4}{\text{Mn}}_{34.0}{\text{Sn}}_{15.6}$. Specifically, we have characterized the fraction of martensite and cubic Heusler phase present along a variety of temperature and magnetic field…
Various morphologies of single-crystal Cu2O such as cube, octahedron, {110} truncated octahedron, and microrhombic dodecahedron with {110} surfaces are prepared in high yield through a facile solution-based one-step reduction method in an alkaline H2O/ethanol/oleic acid system in the presence of d-(+)-glucose. The for…
The deposition of Cu and Au nanoparticles on TiO 2 (110) produces very good catalysts for the WGS. Although bulk metallic gold is not active as a WGS catalyst, Au nanoparticles supported on TiO 2 (110) have an activity comparable to that of Cu/ZnO(000ı̅). Cu/TiO 2 (110) is clearly a better catalyst than Cu/ZnO(0001̅)…
Despite progress in the understanding of crystal nucleation and crystal growth since the first theories for nucleation were developed, an exact quantitative prediction of the nucleation rates in most systems has remained an unsolved problem. Colloidal suspensions show a phase behavior that is analogous to atomic or mo…
A series of alkynylplatinum(II) complexes of 2,6-bis(N-alkylbenzimidazol-2'-yl)pyridine has been synthesized and characterized by (1)H NMR, IR, FAB mass spectrometry, and elemental analysis; the photophysical properties have also been investigated. All the complexes have been shown to exhibit interesting gelation prop…
Self-assembly of a block copolymer into cylindrical and/or perforated lamellar arrays within substrate trenches can be extensively tuned during the solvent-annealing process. Following reactive-ion etching, SEM images reveal that the solvent mixing ratio and the vapor pressure determine the type of array obtained and…
Beta-cyclodextrin (beta-CD)-functionalized CdSe/ZnS quantum dots (QDs) are used for optical sensing and chiroselective sensing of different substrates using a fluorescence resonance energy transfer (FRET) or an electron transfer (ET) mechanisms. The FRET between the QDs and Rhodamine B incorporated in the beta-CD rece…
We report a plane-wave, supercell density functional theory (DFT) investigation of the adsorption and dissociation of water on (111) surfaces of Cu, Au, Pt, Pd, and Ni, five metals of potential interest in the context of water gas shift (WGS) catalysis. Binding energies, preferred adsorption sites, and configurations…
Biocompatible silk optical waveguides are fabricated by direct-write assembly and demonstrated to guide light in both straight and curved architectures. These waveguides can easily be doped or functionalized with bioactive molecules, and are promising materials for biophotonic devices.
Defined nanoparticle cluster arrays (NCAs) with total lateral dimensions of up to 25.4 microm x 25.4 microm have been fabricated on top of a 10 nm thin gold film using template-guided self-assembly. This approach provides precise control of the structural parameters in the arrays, allowing a systematic variation of th…
We report an industrially scalable, fast, and simple process for the large scale fabrication of optically transparent and electrically conducting thin films of single-walled carbon nanotubes (SWNT). Purified, pristine HiPco SWNTs were dispersed in water at high concentrations with the help of surfactants, rod-coated i…
Abstract Multiferroic heterostructures of Fe 3 O 4 /PZT (lead zirconium titanate), Fe 3 O 4 /PMN‐PT (lead magnesium niobate‐lead titanate) and Fe 3 O 4 /PZN‐PT (lead zinc niobate‐lead titanate) are prepared by spin‐spray depositing Fe 3 O 4 ferrite film on ferroelectric PZT, PMN‐PT and PZN‐PT substrates at a low tempe…
A well crystallized powder sample of sodium holmium orthosilicate oxyapatite, Na(2.27)Ho(7.73)(SiO(4))(6)O(0.72), was obtained after mechanical milling and thermal treatment at 1123 K. Crystal structure analysis was performed from the results of Rietveld refinement of the synchrotron diffraction data. As in other rare…
Abstract Surface Enhanced Raman Scattering (SERS) has been used to observe spectra of several amino acids and peptides. SERS signals from amino acids (tryptophan, phenylalanine and glycine) and peptides (Trp‐Trp and Gly‐Gly‐Gly) in silver colloids have been studied in three experimental configurations 1) free volume 2…
(K 0.5 Na 0.5 ) 1− x Li x Nb 0.95 Sb 0.05 O 3 (KNLNS‐ x, x =0–10 mol%) lead‐free piezoelectric ceramics were prepared by the conventional mixed‐oxide method. The temperature stability of the dielectric, piezoelectric, and ferroelectric properties of the two typical compositions (KNLNS‐2 with orthorhombic phase, and KN…