Dejian Zhao

Large-Scale Synthesis of Monodisperse Magnesium Ferrite via an Environmentally Friendly Molten Salt Route

Sub-micrometer-sized magnesium ferrite spheres consisting of uniform small particles have been prepared using a facile, large-scale solid-state reaction employing a molten salt technique. Extensive structural characterization of the as-prepared samples has been performed using scanning electron microscope, transmission electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, and X-ray diffraction. The yield of the magnesium ferrite sub-micrometer spheres is up to 90%, and these sub-micrometer spheres are made up of square and rectangular nanosheets. The magnetic properties of magnesium ferrite sub-micrometer spheres are investigated, and the magnetization saturation value is about 24.96 emu/g. Moreover, the possible growth mechanism is proposed based on the experimental results.

Hierarchically porous ternary Au/ZnO@ZIF-8 nanocomposite: spatial in situ Au encapsulation and catalytic activity for the reduction of p-nitrophenol

A hierarchically porous ternary Au/ZnO@ZIF-8 nanocomposite with flower-like morphology has been prepared using a new in situ encapsulation approach. In particular, Au nanoparticles (NPs) were spatially encapsulated from the ZnO surface into the ZIF-8 crystal matrix during its nucleation process. The ternary composite exhibited high catalytic activity for the reduction of p-nitrophenol.

Sulfur-assisted synthesis of indium nitride nanoplates from indium oxide

Indium nitride (InN) is much more difficult to prepare than other group III nitrides for its low thermal stability. Here, InN nanoplates are prepared by using In2O3, NaNH2 and sulfur as starting materials in a stainless steel autoclave at 190 °C. This method has the advantages of requiring a low temperature and without using an ammonia flow. Field-emission scanning electron microscope shows that the length of InN nanoplates is about 400 nm with the thickness of 50 nm. Finally, the formation mechanism is also investigated.

Solid-state synthesis and magnetic properties of rhombohedral phase Mg2SiNi3

Abstract A solid-state route was developed to prepare rhombohedral phase Mg2SiNi3 with the dimensions of about 300 nm by using metallic magnesium, nickel oxide and silicon as starting materials at 700 °C in an autoclave reactor. The obtained product was investigated by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Magnetic measurement at room temperature indicated that the values of saturation magenetization and coercivity of the obtained Mg2SiNi3 were 0.31 emu g–1 and 65.20 Oe, respectively.