Hongju Zhai

A novel approach to the synthesis of CoPt magnetic nanoparticles

L10 CoPt nanoparticles with face-centred tetragonal (FCT) structure are synthesized by the sol–gel method. Differential thermal analyses show the dehydration of various water molecules and decomposition/combustion of organic groups at a temperature below 600 °C and melting of Co and Pt at 700 °C. X-ray diffraction results show a transition from face-centred cubic to the FCT phase and an increase in particle size with increasing temperature. Transmission electron microscope (TEM) images show that highly monodisperse particles are obtained. High-resolution TEM (HRTEM) images reveal the appearance of L10 ordered phase at temperatures above 600 °C. The survey scans of x-ray photoelectron spectroscopy show that no magnetic impurity is detected within the detection limit. The maximum coercivity (353 344 A m−1) is obtained for the samples heated at 800 °C. The relationship between the temperature and the structure is discussed and the possible growth mechanism is given in terms of atomic diffusion.

Synthesis of ZnSe microdisks and nanobelts and their visible-light photocatalytic properties

ZnSe photocatalytic films made of

Quaternary heterostructured Ag–Bi{sub 2}O{sub 2}CO{sub 3}/Bi{sub 3.64}Mo{sub 0.36}O{sub 6.55}/Bi{sub 2}MoO{sub 6} composite: Synthesis and enhanced visible-light-driven photocatalytic activity

\left\{ {000 1} \right\}

Growth mechanism and optical properties of ZnO nanotube by the hydrothermal method on Si substrates

0001-ended microdisks and

Oriented growth of ZnO nanostructures on different substrates via a hydrothermal method

\left\{ {2\overline{1} \overline{1} 0} \right\}

Effect of polar and non-polar surfaces of ZnO nanostructures on photocatalytic properties

21¯1¯0-ended nanobelts have been successfully synthesized via a solvothermal route followed by annealing in Ar atmosphere. Zn foils are used as both the Zn source and the substrate, Se powder as the Se source, and ethylenediamine (en) as the solvent. Lower temperature and Se concentration prefers the formation of