Using sonochemistry for the fabrication of hollow ZnO microspheres.
Hollow ZnO microspheres assembled by nanoparticles have been prepared by a sonochemical synthesis at room temperature using carbon spheres as template. The growth process of the precursor was investigated. The prepared hollow spheres were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM). The diameter of the obtained hollow spheres is about 500nm, and the walls are composed of numerous ZnO aggregate nanocrystallines with diameters of 90nm. A possible growth mechanism for the formation of ZnO microspheres has been proposed, in which carbon spheres play a crucial role in the formation of the wurtzite hollow ZnO microspheres. The specific structure of the hollow spheres may find applications in nanoelectronics, nanophotonics and nanomedicine.
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, China. xhjia2003@126.com
Xiaohua
X
Jia
Huiqing
H
Fan
Faqiang
F
Zhang
Lei
L
Qin
D002244:Carbon / Q000737:chemistry; D003460:Crystallization; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008863:Microspheres; D050997:Nanomedicine; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry / Q000379:methods; D014465:Ultrasonics; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
D002244:Carbon; D015034:Zinc Oxide