Large-area silicon nanowire arrays have been prepared on a wafer without the use of template. The simple method, which can be carried out near room temperature, involves nanoelectrochemistry silver nanowires in an aqueous HF solution containing nitrate. This technique may generally applicable to other semiconductors and metals. Figure shows nanodendritic wires.

Mn-based aqueous zinc-ion batteries (ZIBs) are promising candidate for large-scale rechargeable energy storage because of easy fabrication, low cost, and high safety. Nevertheless, the commercial application cathode is hindered by challenging issues rate capability poor cyclability. Herein, a manganese–vanadium hybrid, K–V2C@MnO2 cathode, featured with MnO2 nanosheets uniformly formed on V2CTX MXene surface, elaborately designed synthesized metal–cation intercalation following in situ growth...

Phonon density of states calculation shows that a new TiO2 polymorph with tridymite structure is mechanically stable. Enthalpies 9 polymorphs under different pressure are presented to study the relative stability polymorphs. Band structures for calculated by functional theory generalized gradient approximation and band energies at high symmetry k-points corrected using GW method accurately determine gap. The differences between direct gap indirect very small rutile, columbite baddeleyite...

Abstract Exploring highly active and inexpensive bifunctional electrocatalysts for water‐splitting is considered to be one of the prerequisites developing hydrogen energy technology. Here, an efficient simultaneous etching‐doping sedimentation equilibrium (EDSE) strategy proposed design prepare hollow Rh‐doped CoFe‐layered double hydroxides overall water splitting. The elaborate electrocatalyst with optimized composition typical structure accelerates electrochemical reactions, which can...

Abstract This article concerns the detailed investigations on silver dendrite‐assisted growth of single‐crystalline silicon nanowires, and their possible self‐assembling nanoelectrochemistry mechanism. The nanowires was carried out through an electroless metal deposition process in a conventional autoclave containing aqueous HF AgNO 3 solution near room temperature. In order to explore mechanism prove centrality dendrites other etching systems with different species were also investigated...

By a simple method, that is, by heating raw materials in flowing gas at ambient pressure, Si3N4, Ga2O3, and ZnO nanowires, SiC nanocables, SiO2 amorphous nanowires are synthesized without metal catalysts. The diameters of these one-dimensional nanoscale greatly affected synthesis temperatures. At suitable temperatures, their <100 nm. growth mechanisms discussed preliminarily.

We present a first-principles study of effects small biaxial strain ($|\varepsilon|\le 5\%$) and perpendicular electric field (E-field) on the electronic phonon properties low-buckled silicene germanene. With an increase strain, conduction bands at high symmetric $\Gamma$ $M$ points first Brillouin zone shift significantly towards Fermi level in both In contrast, E-field changes band dispersions near open gap K point silicene. found that field-induced opening could be enhanced by compressive...

Transition metal dichalcogenides, MX2 (M = Fe, Co, Ni, X S, Se, Te), have been proven to be promising substitutes for noble metals in hydrogen evolution reactions (HERs). However, forthright comparisons of sulfides, selenides, and tellurides are rarely conducted, let alone the mechanism important role their non-metal ligands. In this paper, we report pilot study a controllable method preparation series NiX2 (X Te) nanosheets via facile anion-exchange reaction. Consequently, HER activities...

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) with layered structures provide a unique platform for exploring the effect of number layers on their fundamental properties. However, thickness scaling chemical properties these materials remains unexplored. Here, we explored chemically induced phase 2D molybdenum disulfide (MoS2) from both experimental and theoretical aspects observed that critical electron injection concentration duration required MoS2 increased decreasing...

Abstract Aqueous zinc‐ion batteries are a low‐cost and safe energy storage system, but suffer from detrimental side reactions Zn dendrites due to the strong interactions between 2+ water molecules in electrolytes, random deposition on anode surface. Here, an electrolyte involving dual‐functional additive of polyethylene glycol (PEG) bypass these issues is reported. The can not only tailor solvation sheath also enable favorably oriented dendrite‐free Zn//Zn cells obtained with high Columbic...

The intercalated Zn 2+ and abundant interfaces between the conductive V 2 CT x O 5 · n H can weaken electrostatic interactions maintain a large lattice channel during cycling, thus reducing activation energy of charge transfer.

Amorphous oxide semiconductor thin-film transistors (AOS TFTs) are ever-increasingly utilized in displays. However, to bring high mobility and excellent stability together is a daunting challenge. Here, the carrier transport/relaxation bilayer stacked AOS TFTs investigated solve mobility-stability conflict. The charge transport layer (CTL) made of amorphous In-rich InSnZnO, which favors big average effective coordination number for all cations more edge-shared structures better transport....

The synthesis and characterization of the clusters Au13[PPh3]4[S(CH2)11CH3]2Cl2 (1) Au13[PPh3]4[S(CH2)11CH3]4 (2) are described. These mixed-ligand, sub-nanometer clusters, prepared via exchange dodecanethiol onto phosphine-halide gold show enhanced stability relative to parent. these features precise determination number atoms in cluster cores using high-angle annular dark-field scanning transmission electron microscopy, allowing assignment 13 (±3 atoms) composition both molecules....

Spectral features, chemical shifts, and absolute thresholds of electron energy loss near-edge structure (ELNES) x-ray absorption (XANES) for selected compounds, i.e. TiO(2) (rutile), (anatase), SrTiO(3), Ti(2)O(3), Al(2)O(3), AlN β-Ga(2)O(3), were calculated by a plane wave pseudopotential method. Experimental ELNES/XANES those compounds well reproduced when an excited pseudopotential, which includes core hole, was used. In addition to the spectral it found that shifts among different also...

The $1s$ core-level excited spectra in LiF, BeO, cubic BN, $\mathrm{Ca}{\mathrm{B}}_{6}$, $\mathrm{Mg}{\mathrm{B}}_{2}$, SiC, diamond, and ${\mathrm{C}}_{3}{\mathrm{N}}_{4}$ were calculated using an ab initio pseudopotential plane wave method a projector augmented reconstruction. Core-hole effects investigated through detailed examination of spectral differences between theoretical results from standard ground state calculations supercell that included the core hole. A quantitative analysis...

A plane wave based method for the calculation of core-level spectra is presented. We provide details implementation in pseudopotential density functional code CASTEP, including technical issues concerning calculations, and discuss applicability accuracy method. number examples are provided comparing results to both experiment other theory techniques.

A corner-pumped type is a new pumping in the diode-pumped solid-state lasers, which has advantages of high pump efficiency and favorable uniformity. Nd:YAG/YAG composite slab continuous-wave 1319 nm/1338 nm dual-wavelength laser first demonstrated this paper. When cavity length 25 mm, maximal output power up to 7.62 W with slope 16.6% an optical-to-optical conversion 17%. The corresponding spectral line widths 1338 are 0.11 0.1 nm, respectively. short-term instability better than 1% when...

The atomic metal core structures of the subnanometer clusters Au13[PPh3]4[S(CH2)11CH3]2Cl2 (1) and Au13[PPh3]4[S(CH2)11CH3]4 (2) were characterized using advanced methods electron microscopy X-ray absorption spectroscopy. number gold atoms in cores these two was determined quantitatively high-angle annular dark field scanning transmission microscopy. Multiple-scattering-path analyses extended fine structure (EXAFS) spectra suggest that Au each complexes adopt an icosahedral with a relaxation...

As a novel class of soft matter, two-dimensional (2D) atomic nanosheet-like crystals have attracted much attention for energy storage devices due to the fact that nearly all atoms can be exposed electrolyte and involved in redox reactions. Herein, atomically thin γ-FeOOH nanosheets with thickness ∼1.5 nm are synthesized high yield, band electronic structures nanosheet revealed using density-functional theory calculations first time. The rationally designed γ-FeOOH@rGO composites...

One-side semihydrogenated monolayers of carbon, silicon, germanium, and their binary compounds with different configurations hydrogen atoms are investigated by density functional theory. Among three considered configurations, zigzag, other than the most studied chair configuration, is energetically favorable structure one-side semihydrogenation. Upon semihydrogenation, semimetallic silicene, germanene, SiGe become semiconductors, while band gap in semiconducting SiC GeC reduced....

Tuning the electrical transport behavior and reducing Schottky barrier height of nanoelectronic devices remain a great challenge. To solve this issue, electronic properties graphene/WSe2 heterostructure are investigated by first-principles method under out-of-plane strain an electric field. Our results show that WSe2 monolayer graphene could form stable van der Waals intrinsic well preserved. Furthermore, transformation contact from n-type to p-type occurs at d = 3.87 Å E +0.06 V Å-1. In...