Materials Literature
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Electrical contact resistance (ECR) influences the electrochemical performance of porous electrodes made of stacked discrete materials (e.g., carbon nanotubes, nanofibers, etc.) for use in supercapacitors and rechargeable batteries. This study establishes a simple elasticity-conductivity model for the ECR of filaments…
We study the vibrational properties of AlN thin films deposited on silicon (100) substrates by the reactive DC-pulsed magnetron sputtering. The frequencies and lifetimes of the E1(TO) and A1(LO) optical phonons are calculated from Fourier transform infrared spectra using the factorized model of a damped oscillator. We…
Conventional microcrystalline pure iron (MC-Fe) becomes a new candidate as biodegradable metals, which has the insufficient physical feature and inferior biodegradation behavior. Novel bulk nanocrystalline pure iron (NC-Fe) was fabricated via equal channel angular pressing technique in the present work to overcome the…
Magnetic anisotropy of perpendicularly magnetized CoFeB|MgO films is spatially tailored using depth controlled Ar ion etching with patterned etching masks. Nanowires with patterned etching have significantly reduced coercivity compared to those without the etching. We show that the sign of the anisotropy can be locall…
We have engineered an antiferromagnetic domain wall by utilizing a magnetic frustration effect of a thin iron cap layer deposited on a chromium film. Through lithography and wet etching, we selectively remove areas of the Fe cap layer to form a patterned ferromagnetic mask over the Cr film. Removing the Fe locally rem…
Disc-shaped monoliths molded from KOH-activated carbon powder (AC) and novolac resin (N) or poly(furfuryl alhohol) (P) binder were activated with CO 2 to open an access to the microporosity that was blocked by the binder char. The variation in the porous texture of monoliths was characterized by the N 2 adsorption at…
Effects of water and oxygen exposures on electronic structures of the bathocuproine (BCP)/fullerene (C 60 ) interface were studied by photoemission spectroscopies. C 60 in BCP/C 60 interface prepared under ultrahigh vacuum (UHV) shows a downward energy level bending of 0.3 eV. The energy level bending of C 60 signific…
This paper describes a laser gain model for the direct, Γ-point transition in bulk Ge. The model allows calculation of gain and spontaneous-emission spectra for arbitrary strain, as well as doping and injected carrier densities. Many-body effects are included at the level of the screened Hartree-Fock approximation to…
Abstract Novel poly (zinc phthalocyanine) (poly(ZnPc)) nanoribbons have been obtained by polycyclotetramerization of bifunctional ZnPc monomers. The microstructures of poly(ZnPc) nanoribbons are characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X‐…
Structures of crown-phenol 1:1 host-guest complexes, 3n-crown-n [12C4(n = 4), 15C5(n = 5), 18C6(n = 6), 24C8(n = 8)], in the gas phase have been studied by various laser spectroscopic methods. The S1-S0 electronic spectra identified 3, 2, 1, and 2 isomers for the complexes of 12C4, 15C5, 18C6, and 24C8, respectively,…
Abstract Poly[2‐(dimethylamino)ethyl methacrylate] (PDMAEMA) was grafted onto the bromine‐functionalized multiwalled carbon nanotubes (MWNTs) by applying an atom transfer radical polymerization (ATRP). The PDMAEMA‐functionalized MWNT was characterized by Fourier transform infrared, transmission electron microscopy, Ra…
It has been shown recently that only a small part of the emitter-base interface in a Si bipolar junction transistor participates in short-pulsing avalanche switching. This lateral current shrinkage attributed to the “winner takes all” effect reduces the transistor switching size from 1600 to ∼100 μm, still remaining m…
Abstract An amphiphilic copolymer of acrylic acid (AA) and 2,2,2‐trifluoroethyl methacrylate (TFEMA) was synthesized by reversible addition‐fragmentation transfer (RAFT) copolymerization, using a feed method for adding TFEMA. The kinetics of the RAFT copolymerization agreed well with those characteristic of a first‐or…
We have investigated systematically the influence on electronic properties of anatase-TiO 2 of codoping by N and Si at different concentrations using Heyd–Scuseria–Ernzerhof (HSE06) hybrid density functional theory calculations. The optimized total energy shows that TiO 2 codoping by N and Si favours a configuration o…
We elucidated surface structure and sum frequency generation (SFG) spectra of aqueous NaF and Na 2 SO 4 solutions by molecular dynamics (MD) simulation. These electrolyte solutions contain hard ions, and their surfaces are considered to be void of ion species. Nevertheless, the two solutions have shown remarkably diff…
Theoretical images of streamers, revealing the mechanisms behind impulse breakdown in liquid dielectrics, are presented. Streamers lead to electrical breakdown by forming paths, capable of carrying large current amplitudes between electrodes. Breakdown delays and terminal currents are calculated for various electrode…
We perform molecular dynamics simulations to demonstrate that when a nanodroplet is confined inside a carbon nanotube (CNT), unidirectional motion can be created by a nonzero surface energy gradient. It is found that the water nanodroplet moves along the direction of increasing surface energy. The transportation effic…
Various aspects of the mechanical behavior of epoxy-based nanocomposites with graphene platelets (GPL) as additives are discussed in this article. The monotonic loading response indicates that at elevated temperatures, the elastic modulus and the yield stress are significantly improved in the composite as compared to…
The ferroelectric polarization dependent bipolar and conductive filament related unipolar resistive switching behaviors are investigated systematically in Au/BiFe0.95Mn0.05O3/La5/8Ca3/8MnO3 heterostructure. The results show that after conductive filaments are formed, the ferroelectric state previously polarized will k…
Using molecular dynamics simulations, we studied the short-time dynamics of the amorphous Cu${}_{50}$Zr${}_{50}$ alloy. We determined the occurrence of a well-defined boson peak in agreement with experimental observations. Our results indicate that the structural origin of the boson peak can be related to Cu and Zr at…