Materials Literature
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Using epitaxially grown graphene on Ru(0001) as a buffer layer, the intrinsic molecular orbitals of perylene-3,4,9,10-tetracarboxylic dianhydride, pentacene, and C60 molecules were imaged by means of scanning tunneling microscope (STM). Combined with density functional theory calculations, our high resolution STM imag…
The effect of inclusion complex formation on the photochromic behavior of a spirobenzopyran dye and its merocyanine isomer was studied in aqueous solution using cucurbit[8]uril (CB8) as a host. The merocyanine (MC) and protonated merocyanine (MCH(+)) were the most stable forms both in water and inside the cavity of CB…
Gold nanoparticles (NPs) stabilized by carboxylate modified polyvinylpyrrolidone have been prepared and fully characterized. The gold NPs efficiently catalyze the aerobic oxidation of benzyl alcohol in water at ambient temperature and are easily separated from the reaction mixture by lowering the pH of the solution, c…
Carbon-doped GeTe is a promising material for use in phase change memories since the addition of C increases the stability of the amorphous phase. By combining x-ray total scattering experiments and ab initio molecular dynamics, we show that carbon deeply modifies the structure of the amorphous phase through long carb…
Molecular self-assembly is the spontaneous association of molecules into structured aggregates by which nature builds complex functional systems. While numerous examples have focused on 2D self-assembly to understand the underlying mechanism and mimic this process to create artificial nano- and microstructures, limite…
The synthesis and thermoresponsive behavior of two structural novel comblike polymers are presented, which are constituted by polymethacrylates main chain with dendritic oligoethylene glycol (OEG) side groups spaced with a linear hydrophobic alkyl [PG1(A)] or hydrophilic OEG unit [PG1(G)]. The design of this comblike…
In recent years, the studies of thermal characteristics have gained importance since it is directly related to clothing comfort. One of the ways of achieving clothing comfort is through moisture management of textiles. Moisture management refers to the controlled movement of water vapor and perspiration from the surfa…
Magnetically recyclable Au/Co/Fe core-shell nanoparticles (NPs) have been successfully synthesized via a one-step in situ procedure. Transmission electron microscope (TEM), energy dispersive X-ray spectroscopic (EDS), and electron energy-loss spectroscopic (EELS) measurements revealed that the trimetallic Au/Co/Fe NPs…
We demonstrate an active metamaterial device that allows to electrically control terahertz transmission over more than one order of magnitude. Our device consists of a lithographically defined gold nano antenna array fabricated on a thin film of vanadium dioxide (VO(2)), a material that possesses an insulator to metal…
The synthesis of a series of platinum acetylide derivatives, featuring linear, triangular, and rectangular shapes, respectively, is described. The structures of these complexes were characterized by multinuclear NMR ( 1 H, 13 C, and 31 P), CSI-TOF mass spectrometry, and elemental analysis. It was found that these comp…
The growth of graphene on copper foil has attracted attention in the last two years due to its feasibility for a controllable growth process. One of the key issues remaining for practical application of graphene in solid-state devices is growth with a large grain size. Because the C–C bond in graphene is strong enough…
We numerically investigate the impact of epoxide adsorbates on the transport properties of graphene nanoribbons with width varying from a few nanometers to 15 nm. For the wider ribbons, a scaling analysis of conductance properties is performed for adsorbate density ranging from 0.1% to 0.5%. Oxygen atoms introduce a l…
Silk fibroin has attracted great interest in tissue engineering because of its outstanding biocompatibility, biodegradability and minimal inflammatory reaction. In this study, two kinds of biocomposites based on regenerated silk fibroin are fabricated by electrospinning and post-treatment processes, respectively. Firs…
We study surface modes at an interface separating two different layered metal-dielectric metamaterials. We demonstrate that, in a sharp contrast to the effective-medium approach predicting a single interface mode with the surface-plasmon dispersion, the transfer-matrix method reveals the existence of three types of lo…
One dimensional quantum-dot superlattices (1D-QDSLs) consisting of acoustically mismatched materials are demonstrated theoretically to possess sub-1 W m${}^{\ensuremath{-}1}$ K${}^{\ensuremath{-}1}$ thermal conductivity in the 50--400 K range of temperatures. We consider coherent Si/Ge 1D-QDSLs, as well as model Si/pl…
Phase-change GeTe/Sb2Te3 multilayered structures, in which the atomic motion at the layer interfaces is limited to one dimension, have been shown to require substantially lower switching energies when compared to monolithic alloys of the same average composition. Here, we report that in the GeTe/Sb2Te3 superlattice, a…
We use molecular dynamics (MD) simulations to examine phonon lifetimes in (10,10) carbon nanotubes (CNTs), both when isolated and when supported on amorphous SiO${}_{2}$ substrates. We determine the intratube phonon-phonon, interfacial, and CNT-substrate phonon scattering rates from the computed inverse lifetimes. Sus…
Three new N-alkyl substituted bis(imino)pyridine iron imide complexes, ((iPr)PDI)FeNR ((iPr)PDI = 2,6-(2,6-(i)Pr(2)-C(6)H(3)-N═CMe)(2)C(5)H(3)N; R = 1-adamantyl ((1)Ad), cyclooctyl ((Cy)Oct), and 2-adamantyl ((2)Ad)) were synthesized by addition of the appropriate alkyl azide to the iron bis(dinitrogen) complex, ((iPr…
Ready to direct: Crystalline selenidostannates were synthesized in imidazolium-based ionic liquids with a small amount of hydrazine monohydrate as additive (see scheme). They are the first open-framework chalcogenides structurally directed by imidazolium cations and are inaccessible by traditional methods.
Stable and luminescent Cu-doped ZnSe nanocrystals (NCs) were synthesized in organic solvents with octadecylamine (ODA) as the capping ligand and characterized using a combination of optical and structural characterization techniques. Successful doping was achieved by adding Cu during the growth phase of the NCs when t…