Materials Literature
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Mechanically robust power devices of high energy efficiency are one of the keys towards overcoming the challenges from the daunting climate change and the depletion of fossil fuels on the earth. The importance of mechanical engineering has been long recognized in physical type power devices, but less so in those based…
A series of rigid π-conjugated bis(terpyridines) ( M1 − M7 ) bearing electron-acceptor spacer units in 4′-position was synthesized in moderate to high yields by Pd 0 -catalyzed Sonogashira cross-coupling reactions. The compounds were fully characterized by NMR spectroscopy, MALDI−TOF mass spectrometry, elemental analy…
Pd−Au bimetallic model catalysts, synthesized either as thin films on Mo(110) or as nanoparticles on a TiO 2 thin film, were used in CO oxidation at both low (1 × 10 −7 Torr) and elevated (8−16 Torr) CO pressures. Alloying with Au forms isolated Pd sites that are incapable of dissociating O 2 . This inability causes r…
We report on the nanometer scale spectral imaging of surface plasmons within individual silver triangular nanoprisms by electron energy loss spectroscopy and on related discrete dipole approximation simulations. A dependence of the energy and intensity of the three detected modes as function of the edge length is clea…
The preparation of cobalt oxide nanowires with gold nanoparticle (AuNP) inclusions (Au-Co(3)O(4) nanowires) via colloidal polymerization of dipolar core-shell NPs is reported. Polystyrene-coated ferromagnetic NPs composed of a dipolar metallic cobalt shell and a gold NP core (PS-AuCoNPs) were synthesized by thermolysi…
We study the origin of the large thermopower in quasi-two-dimensional a $τ$-type organic conductor, $τ-(EDO-S,S-DMEDT-TTF)_2(AuBr_2)_{1+y}$ ($y \le 0.875$), from the view point of a "pudding mold"-type band structure. We calculate the electronic band structure using an \textit{ab initio} band calculation package, and…
Dimensionless thermoelectric figure of merit $ZT$ is investigated for two-dimensional organic conductors $τ-(EDO-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$, $τ$-(EDT-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$ and $τ$-(P-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$ ($y \le 0.875$), respectively. The $ZT$ values were estimated by measuring electrical resist…
Electron correlation effects in the half-metallic ferromagnet NiMnSb are investigated within a combined density functional and many-body approach. Starting from a realistic multiorbital Hubbard model including $\text{Mn}\text{ }d$ and $\text{Ni}\text{ }d$ orbitals, the many-body problem is addressed via the variationa…
By first principle calculations, a dual spin filter effect under finite bias voltages is demonstrated in an antiferromagnetic junction of symmetric zigzag graphene nanoribbon (ZGNR). Unlike conventional spin filter devices using half metallic materials, the up and down-spin electrons are unidirectionally filtered in t…
In-situ, device level measurement of thermal mag-noise spectral linewidths in 60nm diameter CPP-GMR spin-valve stacks of IrMn/ref/Cu/free, with reference and free layer of similar CoFe/CoFeGe alloy, are used to simultaneously determine the intrinsic Gilbert damping for both magnetic layers. It is shown that careful al…
We study the strain relaxation mechanisms of Cu on Pd(111) up to the monolayer regime using two different computational methodologies, basin-hopping global optimization and energy minimization with a repulsive bias potential. Our numerical results are consistent with experimentally observed layer-by-layer growth mode.…
Using first-principles density-functional calculations, we demonstrate that ferromagnetism can be induced and modulated on an otherwise paramagnetic Pd metal thin-film surface through application of an external electric field. As free charges are either accumulated or depleted at the Pd surface to screen the applied e…
Cell adhesion to scaffolds has remained one of the challenges in tissue engineering. Although protein surface modification has been proven to enhance cell adhesion and retention, its specificity depending on cell and biomaterial types means that the best protein and concentration must be established for each specific…
We compute the lattice thermal conductivity (kappa) of silicon nanowires as a function of temperature by molecular dynamics simulations. In wires with amorphous surfaces kappa may reach values close to that of amorphous silicon and is nearly constant between 200 and 600 K; this behavior is determined by the presence o…
A new type of multifunctional unimolecular micelle drug nanocarrier based on amphiphilic hyperbranched block copolymer for targeted cancer therapy was developed. The core of the unimolecular micelle was a hyperbranched aliphatic polyester, Boltorn H40. The inner hydrophobic layer was composed of random copolymer of po…
Conductive polypyrrole/SiC nanocomposites are fabricated via a facile oxidative polymerization approach using p -toluene sulfonic acid as a dopant and ammonium persulfate as an oxidant. The effects of the nanoparticle loading, ratio of oxidant to monomers, and nanoparticle morphology (spheres and rods) on the physicoc…
We calculate the effect of epitaxial strain on the structure and properties of multiferroic bismuth ferrite, ${\text{BiFeO}}_{3}$, using first-principles density-functional theory. We investigate epitaxial strain corresponding to an (001)-oriented substrate and find that, while small strain causes only quantitative ch…
Contact angle goniometry is conducted for epitaxial graphene on SiC. Although only a single layer of epitaxial graphene exists on SiC, the contact angle drastically changes from 69 degrees on SiC substrates to 92 degrees on graphene. It is found that there is no thickness dependence of the contact angle from the measu…
We present first-principles calculations of electronic properties of graphene under uniaxial and isotropic strains, respectively. The semimetallic nature is shown to persist up to a very large uniaxial strain of 30% except a very narrow strain range where a tiny energy gap opens. As the uniaxial strain increases along…
The temperature dependence of the magnetic-resonance spectra of nitrogen-vacancy (${\mathrm{NV}}^{\ensuremath{-}}$) ensembles in the range of 280--330 K was studied. Four samples prepared under different conditions were analyzed with ${\mathrm{NV}}^{\ensuremath{-}}$ concentrations ranging from 10 ppb to 15 ppm. For al…