Phase-Selective Synthesis of Mo-Ta-C Ternary Nanosheets by Precisely Tailoring Mo/Ta Atom Ratio on Liquid Copper.

Phase-selective synthesis is an effective way to expand the ultra-thin transition metal carbide family and tune its properties. Herein, a chemical vapor deposition route with specially designed substrate (Ta wire-Cu foil-Mo foil) is carried out to synthesize Mo-Ta-C ternary nanosheets with tunable phase structure. The Ta atoms diffuse on the surface of liquid copper and Mo atoms diffuse through the liquid copper to the surface, which react with the carbon atoms decomposed from the methane and form the Mo-Ta-C ternary nanosheets.

One-step chemical vapor deposition fabrication of Ni@NiO@graphite nanoparticles for the oxygen evolution reaction of water splitting.

NiO combined with conductive materials is a practicable way to improve its catalytic property for the oxygen evolution reaction (OER) by enhancing its electrical conductivity. Herein, Ni@NiO@graphite nanoparticles less than 20 nm in average diameter were synthesized by a one-step chemical vapor deposition process. Due to the deliberately controlled lack of oxygen, Ni particles and carbon clusters decomposed from NiCp precursors were oxidized incompletely and formed Ni@NiO core-shell nanoparticles coated by a graphite layer.

Cs CO -Promoted C-O Coupling Protocol Enables Solventless (Hetero)aryl Ether Synthesis under Air Atmosphere.

In this work, a Cs CO -promoted synthetic approach was identified for (hetero)aryl ether synthesis via the C-O coupling of various (hetero)aryl chlorides and alcohols/phenol. To our delight, the reactions could be carried out under transition-metal-free and solvent-free conditions. Moreover, analytical-grade reagents and air atmosphere were readily tolerated.

In Situ Doping of Nitrogen in <110>-Oriented Bulk 3C-SiC by Halide Laser Chemical Vapour Deposition.

Doping of nitrogen is a promising approach to improve the electrical conductivity of 3C-SiC and allow its application in various fields. N-doped, <110>-oriented 3C-SiC bulks with different doping concentrations were prepared via halide laser chemical vapour deposition (HLCVD) using tetrachlorosilane (SiCl) and methane (CH) as precursors, along with nitrogen (N) as a dopant. We investigated the effect of the volume fraction of nitrogen () on the preferred orientation, microstructure, electrical conductivity (), deposition rate (), and optical transmittance.

Structural Controlling of Highly-Oriented Polycrystal 3C-SiC Bulks via Halide CVD.

Highly-oriented polycrystal 3C-SiC bulks were ultra-fast fabricated via halide chemical vapor deposition (CVD) using tetrachlorosilane (SiCl₄) and methane (CH₄) as precursors. The effects of deposition temperature () and total pressure () on the orientation and surficial morphology were investigated. The results showed that the growth orientation of 3C-SiC columnar grains was strongly influenced by T.

Morphology controlling of 〈111〉-3C-SiC films by HMDS flow rate in LCVD.

Morphology of 〈111〉-oriented 3C-SiC films was transformed from mosaic to whisker to cauliflower-like with the increased flow rate () of hexametyldisilane (HMDS) in the process of laser chemical vapor deposition (LCVD). The SiC whiskers were naturally sharp hexagonal pyramids with average height of 250 nm and an aspect ratio in the range of 5 to 10, with a density of 1.3 × 10 mm.

Structural study of epitaxial NdBaCuO films by laser chemical vapor deposition.

Epitaxial NdBaCuO films were prepared on (100) LaAlO single crystal substrates by laser chemical vapor deposition (laser CVD). The effect of deposition temperature on preferred orientation, crystallinity, microstructure, deposition rate of films was investigated. The preferred orientation of the NdBCO films changed from , -axis to -axis, then back to , -axis, as the deposition temperature was increased from 993 to 1093 K.

Morphology and mechanical behavior of diamond films fabricated by IH-MPCVD.

Morphology of diamond films has been controlled intermediate frequency induction heated microwave plasma chemical vapor deposition (IH-MPCVD), which was transformed with various substrate temperatures ( = 923-1123 K) and CH/H ratios ( = 0.5-2 vol%). The coupling effects of and on the structure of diamond films have been studied.

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition.

In this study, we demonstrated the chemical vapor deposition (CVD) of vertically standing molybdenum disulfide (MoS₂) nanosheets, with an unconventional combination of molybdenum hexacarbonyl (Mo(CO)₆) and 1,2-ethanedithiol (C₂H₆S₂) as the novel kind of Mo and S precursors respectively. The effect of the distance between the precursor’s outlet and substrates (denoted as ) on the growth characteristics of MoS₂, including surface morphology and nanosheet structure, was investigated. Meanwhile, the relationship between the structure characteristics of MoS₂ nanosheets and their catalytic performance for hydrogen evolution reaction (HER) was elucidated.

[About "Xiang" in traditional Chinese medicine].

The "Xiang" in traditional Chinese medicine (TCM) contains various meanings such as phenomena, image and symbols. When we consider it as a thinking mode, "Xiang" permeates into all TCM aspects from natural phenomena, anatomical structures of human tissues to physiological functions as well as pathological manifestations of zang-fu organs. In addition, it may have profound but different connotations.

[Sexual development in adolescents after surgical treatment for cryptorchidism].

Objective: To investigate the sexual development in adolescents after surgical treatment for undescended testes.

Methods: One hundred and eighty-four adolescents undergoing surgery for cryptorchidism before the age of 10 years, 22 cases received no surgical management for unilateral undescended testes, and 25 normal controls were studied. The pubic stage, the natural length and girth of the penis, the volume of the testis, serum luteinizing hormone (LH), follicle-stimulating hormone (FSH) and testosterone (T) were examined to find out the effect of age, the location of the testis and operative procedures on prognosis.