Materials Literature
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We have developed a new method to grow uniform graphene films directly on various substrates, such as insulators, semiconductors, and even metals, without using any catalyst. The growth was carried out using a remote plasma enhancement chemical vapor deposition ( r -PECVD) system at relatively low temperatures, enabli…
We report highly facet-dependent electrical properties of Cu(2)O nanocubes and octahedra and significant enhancement of gold nanocrystal cores to the electrical conductivity of Au-Cu(2)O core-shell octahedra. Cu(2)O nanocubes and octahedra and Au-Cu(2)O core-shell cubes and octahedra were synthesized by following our…
Three types of hollow urchinlike α-MnO 2 nanostructures, namely, columnar nanorod clusters, tetragonal nanotube clusters, and tetragonal nanorod clusters, have been synthesized through a facile hydrothermal method. The microstructure and morphologies of the resulting materials were investigated by X-ray diffraction, s…
Mesoporous organic-inorganic hybrid materials are an interesting class of materials, which combine the advantages of two worlds; the inorganic part builds a robust substrate while organic functions make them alive in a way that they can be potentially used in a number of applications. In this tutorial review, we provi…
Although deformation processes in submicron-sized metallic crystals are well documented, the direct observation of deformation mechanisms in crystals with dimensions below the sub-10-nm range is currently lacking. Here, through in situ high-resolution transmission electron microscopy (HRTEM) observations, we show that…
The interaction between graphene and metal was investigated by studying the G band splitting in surface-enhanced Raman scattering (SERS) spectra of single-, bi-, and trilayer graphene. The Ag deposition on graphene induced large enhancement of the Raman signal of graphene, indicating SERS of graphene. In particular, t…
Research on organic-inorganic hybrid materials containing trivalent lanthanide ions (Ln(3+)) is a very active field that has rapidly shifted in the last couple of years to the development of eco-friendly, versatile and multifunctional systems, stimulated by the challenging requirements of technological applications sp…
A facile hydrazine hydrate reduction of graphene oxide (GO) with surface-passivated by a polyethylene glycol (PEG) method for the fabrication of graphene quantum dots (GQDs) with frequency upconverted emission is presented. And we speculate on the upconversion luminescence due to the anti-Stokes photoluminescence (ASP…
Electrochemical supercapacitors (ECs), characteristic of high power and reasonably high energy densities, have become a versatile solution to various emerging energy applications. This critical review describes some materials science aspects on manganese oxide-based materials for these applications, primarily includin…
Scheme 1. Schematic representation of tubular nanostructure by self assembled GDA amphiphilic templating process (left: SNT-1, right SNT-2) Many efforts have been devoted to synthesize various kind of inorganic nanotubes due to their numerous significant applications. Among them hollow silica nanotubes (SNTs) have dra…
We study here the Raman frequencies of the lattice modes (γ and β phases) and of an internal mode (γ phase) as a function of temperature in solid nitrogen. The frequency shift derived from the anharmonic self energy, is fitted to the experimental data for the Raman frequencies of the modes considered here in the γ and…
A simple mathematical model for the depletion force between two arbitrarily shaped large convex colloidal particles immersed in a suspension of small spherical particles is proposed. Using differential geometry, the interaction potential is expressed in terms of the mean and Gaussian curvature of the particle surfaces…
Abstract Large eddy simulation model is used to simulate the fluid flow and heat transfer in an industrial Czochralski crystal growth system. The influence of Marangoni convection on the growth process is discussed. The simulation results agree well with experiment, which indicates that large eddy simulation is capabl…
The present letter deals with the synthesis of ultrasmall Gd2S3:Eu3+ nanoparticles and their surface modification with “cytosine,” a nucleobase present in DNA/RNA. These nanoparticles show orthorhombic (Pnma) crystal symmetry with excellent magnetic and luminescent characters simultaneously. In contrast to the previou…
We employed nanometer-scale spatially resolved electron energy loss spectroscopy to monitor the degree and localization of electronic passivation of graphene surfaces by using the π-plasmon as an indicator of sp2-bonding. Upon hydrogenation, the π-plasmon does not vanish, and a new feature at 7 eV occurs in the spectr…
The effect of pH on the stability of layer-by-layer deposited polygalacturonic acid (PGalA)-based multilayer films prepared with the polycations poly-L-lysine, chitosan, and lysozyme is studied. The response was characterized using a quartz crystal microbalance, dual polarization interferometry, and Fourier transform…
The adsorption properties of individual fullerene molecules at room-temperature have been investigated by scanning tunneling microscopy. Statistical analysis of the images demonstrates that fullerene molecules prefer to adsorb on five specific sites: corner hole, the middle of the faulted and unfaulted parts, and the…
Uma classe de plásticos com destaque crescente são os polímeros biodegradáveis, como a Poli(ε-caprolactona) (PCL). Quando esses polímeros são utilizados para elaboração de compósitos com fibras naturais, novas propriedades são agregadas. Existem vários métodos de modificação química da fibra para melhorar a adesão des…
Graft polymerization of acrylonitrile onto delingnified cellulosic material obtained from Nigeria grown Bamboo (Bambusa vulgaris) could be initiated by ceric ammonium nitrate redox system. Optimization of grafting of acrylonitrile onto cellulosic material was performed by varying the reaction conditions, such as durat…
We study the defect structure of crystalline particle arrays on negative Gaussian curvature capillary bridges with vanishing mean curvature (catenoids). The threshold aspect ratio for the appearance of isolated disclinations is found and the optimal positions for dislocations determined. We also discuss the transition…