Xiaoyan Hu

Self-assembled 3D flower-like Ni2+?Fe3+ layered double hydroxides and their calcined products

This paper describes a facile solvothermal method to synthesize self-assembled three-dimensional (3D) Ni2+-Fe3+ layered double hydroxides (LDHs). Flower-like Ni2+-Fe3+ LDHs constructed of thin nanopetals were obtained using ethylene glycol (EG) as a chelating reagent and urea as a hydrolysis agent. The reaction mechanism and self-assembly process are discussed. After calcinating the as-prepared LDHs at 450 degrees C in nitrogen gas, porous NiO/NiFe2O4 nanosheets were obtained. This work resulted in the development of a simple, cheap, and effective route for the fabrication of large area Ni2+-Fe3+ LDHs as well as porous NiO/NiFe2O4 nanosheets.

A two-step method to synthesize BaSn(OH) 6 crystalline nanorods and their thermal decomposition to barium stannate

A novel two-step technique is introduced to synthesize BaSn(OH)6 nanorods. The method involves the preparation of precursor Na2Sn(OH)6 crystals in aqueous solution via hydrothermal method and the ion-exchange reaction between Na2Sn(OH)6 crystals and Ba2+ solution that followed, assisted by ultrasonic treatment. The BaSn(OH)6 nanorods array are formed due to the split of plate-formed Na2Sn(OH)6 during the ion-exchange treatment. The influence of the surfactant on the growth of the one-dimensional (1D) BaSn(OH)6 nanostructures is investigated. In addition, the powder BaSnO3 has been obtained by thermal treatment at 450°C for 5 h under inert gas protecting condition using BaSn(OH)6 nanorods as precursor. The 1D shape of BaSn(OH)6 was retained after thermal treatment.