Materials Literature
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We used the anomalous Hall effect to study the magnetic properties of MgO/Fe(t)/MgO(001) structures in which the Fe thickness t ranged from 4 Å to 14 Å. For the iron deposited at 140 K, we obtained perpendicular magnetization at room temperature below the critical thickness of tc = (9 ± 1) Å. In the vicinity of tc, th…
Gold nanoparticles are excellent intracellular markers in X-ray imaging. Having shown previously the suitability of gold nanoparticles to detect small groups of cells with the synchrotron-based computed tomography (CT) technique both ex vivo and in vivo, it is now demonstrated that even single-cell resolution can be o…
Atomic-scale imaging using aberration-corrected scanning transmission electron microscopy reveals direct evidence for semicoherent interfacial epitaxy and coordinate-dependent surface contraction for the fcc (001) oriented Au nanoparticles (2-3 nm in diameter), suggesting that their interaction with the substrate is w…
We present a theoretical study on iron pyrite using density-functional theory (DFT) and the $GW$ approximation to many-body perturbation theory. The fundamental band gap of iron pyrite is determined by iron 3$d$ states at the valence band edge and a sulfur 3$p$-dominated conduction band at $\ensuremath{\Gamma}$. The g…
Adsorption and activation of CO 2 can be considered as the first steps of the reaction mechanism of methanol synthesis via CO 2 hydrogenation on Cu-based bimetallic clusters. In this work, the adsorption properties of CO 2 on Cu 55, Cu 54 Ni 1, and Cu 42 Ni 13 clusters with highly symmetric cuboctaheral (Cubo), decahe…
Time-resolved laser spectroscopy studies of complete solar cells sensitized with a near-infrared absorbing dye (HY103) and filled with different electrolytes are applied to explain their macroscopic parameters (efficiency and short-circuit current). Particular attention is paid to the effect of coadsorbent, size of ca…
In this paper, the spectral and nonlinear optical properties of a colloidal solution of platinum nanoparticles (Pt NPs) in water are presented. The Pt NPs were prepared by laser ablation of a Pt metallic target in distilled water using a 1064 nm high frequency Nd:YAG laser. The intensity-dependent nonlinear optical ab…
Thin-film ferromagnetic disks present a vortex spin structure whose dynamics, added to the small size ($\ensuremath{\approx}$10 nm) of their core, has earned them intensive study. Here we use a scanning nitrogen-vacancy (NV) center microscope to quantitatively map the stray magnetic field above a $1\ensuremath{-}\ensu…
The response of concentrated dispersions of charged colloids to low-frequency electric fields is governed by field-induced inter-colloidal interactions resulting from the polarization of electric double layers and the layer of condensed ions, association and dissociation of condensed ions, as well as hydrodynamic inte…
Five compounds including quercetin (AC01), asparagine (AC02), sucrose (AC03), β-sitosterol-3-O-β-D-glucopyranoside (AC04) and β-sitosterol (AC05) were isolated from the methanol extract of Asparagus cochinchinensis (Lour.) Merr. tuber collected in Ba Ria–Vung Tau Province of Vietnam. Their structures were elucidated b…
The coupling of charge, lattice, orbital, and spin degrees of freedom was studied in a $p$-electron mixed-valence Cs${}_{4}$O${}_{6}$ compound by the electron paramagnetic resonance (EPR) and ${}^{133}$Cs nuclear magnetic resonance (NMR). The dramatic differences in the evolution of the EPR and ${}^{133}$Cs NMR spectr…
In a recent publication [Chen et al., Phys. Rev. B 86, 165136 (2012)], we identified a line of Lifshitz transition points separating the Fermi liquid and pseudogap regions in the hole-doped two-dimensional Hubbard model. Here, we extend the study to further determine the superconducting transition temperature in the p…
Ionic transport through nanometer scale channels or interfaces is the physical origin of the detection signals in stochastic single molecular sensing, DNA sequencing and nano-structured electrodes. Dynamic transport regulated by systematically varying the bias frequency has not been explored. In this report, ion trans…
Abstract New salicylaldimine‐based diboron complexes 1–3 have been synthesized and characterized by multinuclear NMR spectroscopy, mass spectrometry, and single‐crystal X‐ray analysis (1 and 3). The photophysical and electrochemical properties of these compounds have been investigated experimentally and with theoretic…
Macroscopic galvanic cell-driven metal catalyzed electroless etching (MCEE) of silicon in aqueous hydrofluoric acid (HF) solution is devised to fabricate silicon nanowire (SiNW) arrays with dissolved oxygen acting as the one and only oxidizing agent. The key aspect of this strategy is the use of a graphite or other no…
Three 3-amino-1,2,4-triazole (Hatz)-based paramagnetic metal complexes, {[Co2(Hatz)2(nip)2]·H2O}n (1), [Co(atz)(nb)]n (2), and {[Co3(H2O)4(Hatz)6(btc)2]·11.5H2O} (3) (nip2− = 5-nitroisophathalate, nb– = p-nitrobenzolate, and btc3– = 1,2,4-benzenetricarboxylate), were respectively prepared by introducing differently ca…
Two diketopyrrolopyrrole (DPP)–carbazole (Cz) based π-conjugated copolymers, PDBTCz-H (P1) and PDBTCz-Me (P2), were designed and synthesized to study the effects of N-substitution of the carbazole unit on the molecular ordering, main chain conjugation, and charge transport properties of these polymers. It was found th…
Using experiments with single-particle resolution and computer simulations we study the collective behavior of multiple vacancies injected into two-dimensional crystals. We find that the defects assemble into linear strings, terminated by dislocations with antiparallel Burgers vectors. We show that these defect string…
The surface chemistry for TiO2 atomic layer deposition (ALD) typically utilizes water or other oxidants that can oxidize underlying substrates such as magnetic disks or semiconductors. To avoid this oxidation, waterless or oxidant-free surface chemistry can be used that involves titanium halides and titanium alkoxides…
An array of H-shaped subwavelength slits in a plasmonic film has a polarization dependent extra-ordinary transmission due to shape anisotropy. Non-overlapping extra-ordinary transmission bands for the orthogonal linear polarization states of the input light are used to demonstrate a polarization dependent color switch…