High-purity magnetic CoNi submicrospherical chains, each of length 20 μm - 30 μm and self-assembled from fcc-phase CoNi submicrospheres of average diameter 800 nm, are synthesized via a surfactant-assisted solvother...High-purity magnetic CoNi submicrospherical chains, each of length 20 μm - 30 μm and self-assembled from fcc-phase CoNi submicrospheres of average diameter 800 nm, are synthesized via a surfactant-assisted solvothermal route without the aid of nucleation agent. The effects of surfactant and reducing agent on the morphology and size of the CoNi chains are studied, and a possible growth mechanism for the CoNi chains is proposed. The CoNi chains show ferromagnetic characteristics with a similarly small saturation magnetization of 104.1 emu/g and a larger coercivity of 150 Oe at room temperature compared to the monodispersed CoNi submicrospheres of 105 emu/g and 34 Oe as a result of the increased shape anisotropy.展开更多
LaNiC2 was synthesized by a solvothermal route in a stainless steel autoclave at 600℃. In this process, nickel chloride, lanthanum chloride and toluene were used as raw materials, and metallic Na and Li alloy were us...LaNiC2 was synthesized by a solvothermal route in a stainless steel autoclave at 600℃. In this process, nickel chloride, lanthanum chloride and toluene were used as raw materials, and metallic Na and Li alloy were used as reductant. The products were characterized with an X-ray diffractometer （XRD） and a scanning electron microscope （SEM）. The LaNiC2 products consisted of a great deal of micro-rods. The micro-rods had diameters ranging from hundreds of nanometers to several micrometers and lengths ranging from several micrometers to tens of micrometers.展开更多
A chemical reaction for the preparation of B-C-N compounds by using carbon tetrachloride （CC14）, boron tribromide （BBr3）, lithium nitride （Li3N） and sodium as reactants has been carried out at the temperature of...A chemical reaction for the preparation of B-C-N compounds by using carbon tetrachloride （CC14）, boron tribromide （BBr3）, lithium nitride （Li3N） and sodium as reactants has been carried out at the temperature of 400℃. Measurements of FTIR, XRD, TEM and EELS show that two kinds of compounds have been formed in the prepared sample. One is hollow sphere-like C-N with an amorphous, structure; the other is piece-like polycrystalline B-C-N with the hexagonal structure. Their determined compositions are close to C3N and BC2N, respectively.展开更多
{001} facets dominated single crystalline anatase TiO2 nanosheet array （TNSA） was synthe-sized through an optimized organic solvothermal route on uorine-doped tin oxide substrate. The field emission scanning electro...{001} facets dominated single crystalline anatase TiO2 nanosheet array （TNSA） was synthe-sized through an optimized organic solvothermal route on uorine-doped tin oxide substrate. The field emission scanning electron microscopy images and X-ray diffraction patterns re-vealed that the {001} synthesized facets dominated TNSA exhibited much higher orientation than that synthesized by hydrothermal route. The TNSAs were loaded with Pt nanoparti-cles in uniformly size by using a photodecomposition method, which were further con rmed by high resolution transmission electron microscopy （HRTEM）. The HRTEM images also revealed that Pt nanoparticles preferred to deposit on {001} facets. With loading of Pt nanoparticles, the optical absorbance was significantly enhanced, while the photolumines- cence （PL） was inhibited. The photocatalytic activity of TNSA was signi cantly improved by Pt loading and reached the maximum with optimal amount of Pt loading. The optimal amount of Pt on {001} facets is far less than that on TiO2 nanoparticles, which may be attributed to the specific atom structure of reactive {001} facets.展开更多
The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron mi...The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.展开更多
文摘High-purity magnetic CoNi submicrospherical chains, each of length 20 μm - 30 μm and self-assembled from fcc-phase CoNi submicrospheres of average diameter 800 nm, are synthesized via a surfactant-assisted solvothermal route without the aid of nucleation agent. The effects of surfactant and reducing agent on the morphology and size of the CoNi chains are studied, and a possible growth mechanism for the CoNi chains is proposed. The CoNi chains show ferromagnetic characteristics with a similarly small saturation magnetization of 104.1 emu/g and a larger coercivity of 150 Oe at room temperature compared to the monodispersed CoNi submicrospheres of 105 emu/g and 34 Oe as a result of the increased shape anisotropy.
基金the Science and Technology Project of Guangdong Province(2KM02304G and 2005A11001001)Qian Bai Shi Project of Guangdong Province(Q02059)International Cooperation Project of Hubei Province(2006CA014)
文摘LaNiC2 was synthesized by a solvothermal route in a stainless steel autoclave at 600℃. In this process, nickel chloride, lanthanum chloride and toluene were used as raw materials, and metallic Na and Li alloy were used as reductant. The products were characterized with an X-ray diffractometer （XRD） and a scanning electron microscope （SEM）. The LaNiC2 products consisted of a great deal of micro-rods. The micro-rods had diameters ranging from hundreds of nanometers to several micrometers and lengths ranging from several micrometers to tens of micrometers.
基金Supported by the National Natural Science Foundation of China under Grant Nos 50225207, 10325417, 50372055, 50472051 and 50532020, and the National Basic Research Programme of China under Grant No 2005CB724400.
文摘A chemical reaction for the preparation of B-C-N compounds by using carbon tetrachloride （CC14）, boron tribromide （BBr3）, lithium nitride （Li3N） and sodium as reactants has been carried out at the temperature of 400℃. Measurements of FTIR, XRD, TEM and EELS show that two kinds of compounds have been formed in the prepared sample. One is hollow sphere-like C-N with an amorphous, structure; the other is piece-like polycrystalline B-C-N with the hexagonal structure. Their determined compositions are close to C3N and BC2N, respectively.
文摘{001} facets dominated single crystalline anatase TiO2 nanosheet array （TNSA） was synthe-sized through an optimized organic solvothermal route on uorine-doped tin oxide substrate. The field emission scanning electron microscopy images and X-ray diffraction patterns re-vealed that the {001} synthesized facets dominated TNSA exhibited much higher orientation than that synthesized by hydrothermal route. The TNSAs were loaded with Pt nanoparti-cles in uniformly size by using a photodecomposition method, which were further con rmed by high resolution transmission electron microscopy （HRTEM）. The HRTEM images also revealed that Pt nanoparticles preferred to deposit on {001} facets. With loading of Pt nanoparticles, the optical absorbance was significantly enhanced, while the photolumines- cence （PL） was inhibited. The photocatalytic activity of TNSA was signi cantly improved by Pt loading and reached the maximum with optimal amount of Pt loading. The optimal amount of Pt on {001} facets is far less than that on TiO2 nanoparticles, which may be attributed to the specific atom structure of reactive {001} facets.
基金This work was supported by the National Natural Science Foundation of China.
文摘The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.
