Materials Literature
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We have investigated the photoluminescence and ultrafast dynamics of LaAlO3 crystal. The photoluminescence consists of a broad spectrum and two sharp peaks, which arise from various defect levels within the bandgap. A doublet splitting of roughly 6 nm is seen in these two sharp peaks. An Al displacement of 0.09 Å in a…
The thermomechanical behavior of [0001]-oriented GaN nanowires with 2.26 and 3.55 nm in diameter under tensile loading is analyzed using molecular dynamics simulations with the Green–Kubo method and quantum correction. A phase transformation from wurtzite to a tetragonal structure is observed. The thermal conductivity…
Abstract A water soluble chitosan derivative ( p ‐chitosan) was synthesized and used to functionalize multiwalled carbon nanotubes (MWCNTs) through the noncovalent interaction. The interaction of p ‐chitosan with MWCNTs was investigated by analyzing the spectra of ultraviolet‐visible, Fourier transform infrared, Raman…
A new macrocyclic bolaamphiphile with thiocytosine fragments in the molecule (B1) has been synthesized and advanced as perspective platform for the design of soft supramolecular systems. Strong concentration-dependent structural behavior is observed in the water-DMF (20% vol) solution of B1 as revealed by methods of t…
The photoelectrocatalytic activity of polyterthiophene (PTTh) was investigated. PTTh prepared by the vapour phase polymerisation technique was used as a working electrode. When the electrode was used in electrochemical water oxidation, illumination produced a significant increase in oxidation current at potentials beg…
To examine the effect of pore-wall structure on freezing and melting behavior of a confined material in mesopores, we measured X-ray diffraction patterns from Kr confined in two kinds of ordered mesoporous carbons with hexagonally shaped pores, compared with ordered mesoporous silica with cylindrical pores, during fre…
The discovery of ferroelectrics induced by peculiar magnetic structures brought about extensive theoretical and experimental studies. The key driving force for these magnetic ferroelectrics appears to lie in the inverse Dzyaloshinskii-Moriya (DM) interaction in magnets with long-wavelength ``noncollinear'' spin struct…
A polarization-independent liquid crystal lens that is based on axially symmetric photoalignment is demonstrated. This liquid crystal lens is fabricated by combining radially and azimuthally aligned liquid crystal films with gradient alignments. The configurations of liquid crystals on the substrates are confirmed bot…
We calculate from first principles the optical spectra of the hydrides in the sodium alanate hydrogen storage system: NaH, NaAlH${}_{4}$, and Na${}_{3}$AlH${}_{6}$. In particular we study the effects of systematic improvements of the theoretical description. To benchmark the calculations we also measure the optical re…
When the size of La 2 O 3 /Eu 3+ phosphor decreases to the nanoscale, the rigidity of the lattice environment is decreased, causing the enlargement of the charge-transfer state (CTS) coordinate offset for the optical centers in La 2 O 3 /Eu 3+ nanophosphor. The enlargement of the CTS coordinate offset results in the d…
A modified planetary rotation system has been developed to obtain high uniformity optical coatings on large substrates in an ion beam sputter coater. The system allows the normally fixed sun gear to rotate, thus allowing an extra degree of freedom and permitting more complex motions to be used. By moving the substrate…
Abstract Epoxy‐based composites of ferrite nanoparticles (50 nm) with 3‐glycidoxypropyl‐ (GPTMS), aminopropyl‐ (APTMS), or methyl‐silsesquioxane (MTMS) coatings are reported. The GPTMS coatings (30‐nm thick) allowed uniform particle dispersion in the epoxy and prevented sedimentation of the nanoparticles, whereas the…
We report the role of interdiffusion in molecular beam epitaxy of the binary Heusler alloy system Fe${}_{1\ensuremath{-}x}$Si${}_{x}$/GaAs(001), employing a variety of complementary techniques that, in their combination, provide quantitative insight into the dynamics of the involved processes. The main properties of t…
Understanding the structures and stability conditions of emerging liquid crystal (LC) phases brings us a step closer to the crucial understanding of delicate self-assembling nanoscale systems and the consequential impact on their macroscopic properties. We report experimental evidence and a theoretical model for a fer…
An unexpected presence of ferromagnetic (FM) ordering in nanostructured ZnO has been reported previously. Recently, from our detailed magnetization studies and ab initio calculations, we attributed this FM ordering in nanostructured ZnO to the presence of surface states, and a direct correlation between the magnetic p…
The dynamic mechanisms involved in the dehydrogenation of ammonia borane are investigated using quasi-classical trajectory simulations. The effects of solvent and nuclear motion yield qualitatively different results compared to simulations where these considerations are neglected. Not only are rate-limiting barriers s…
In this paper, we review a number of uses of conformal mapping techniques for obtaining director profiles of liquid crystals in confined and semi-confined geometries. In particular, we will consider geometries which allow more than one stable state, some of which are of use in bistable displays. These solutions also a…
The authors report the formation of β-Ga2O3/GaN heterostructure and the fabrication of a β-Ga2O3/GaN bilayer photodetector (PD). It was found that we could control the depletion depth of the device and thus switch the operation mode between solar-blind and visible-blind by simply changing the applied bias. It was also…
The vibrational properties of ErTe${}_{3}$ were investigated using Raman spectroscopy and were analyzed on the basis of peculiarities of the RTe${}_{3}$ crystal structure. Four Raman active modes for the undistorted structure, predicted by factor-group analysis, are experimentally observed and assigned according to di…
Arrays of Au hierarchical micro/nanotowers have been achieved on Au-coated silicon planar substrate, via electrochemical deposition in a mixed aqueous solution of PVP and HAuCl 4 under appropriate electrodeposition conditions. The Au hierarchical micro/nanotower arrays have exhibited distinct surface-enhanced Raman sc…