Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (04): 881-888.doi: 10.3866/PKU.WHXB201302051

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles    

Preparation and Properties of Monodisperse SnO2 Hollow Micro/Nano Spheres

CAI Hong-Min1, REN Su-Zhen1, WANG Meng1, JIA Cui-Ying2   

  1. 1 College of Chemistry, Dalian University of Technology, Dalian, 116024, Liaoning Province, P. R. China;
    2 The experiment center of Chemistry, Dalian University of Technology, Dalian, 116024, Liaoning Province, P. R. China
  • Received:2012-11-26 Revised:2013-01-30 Published:2013-03-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21176043).

Abstract:

Templating is one of the most important methods for preparation of inorganic hollow micro/ nano spheres. We prepared monodisperse polystyrene (PS) microspheres having a diameter of 620 nm by the emulsion polymerization of styrene. Sulfonated polystyrene (PSS) microspheres were used as a template, through electrostatic adsorption of anions and cations, for modification with Sn2+ from SnSO4 precursor. The core-shell composite structures thereby produced through Sn2+ hydrolysis in an ethanolwater medium were calcined at high temperature to remove PSS and to obtain SnO2 hollow micro/nano spheres. We investigated the effects of precursor concentration, amount of surfactant, reaction time, and templates choice. Scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared (IR) spectroscopy, thermogravimetric analysis (TGA), H2 temperature programmed reduction (H2-TPR), Brunauer-Emmett-Teller (BET) measurement, and other technical probes were used to detect the structure and properties of the prepared SnO2 hollow micro/nano spheres, and compared them with those of solid SnO2. BET and H2-TPR showed that the hollow SnO2 micro/nano spheres had improved specific surface area, surface oxygen vacancies, and oxidation activity. We inferred the growth mechanism of the core-shell structure from IR spectroscopy and XRD pattern and optimized the simple and reasonable synthesis procedure to obtain SnO2 hollow micro/nano spheres which had smooth surface, compact structure, and well controlled cladding thickness.

Key words: SnO2, Hollow micro/nano sphere, Core-shell structure, Template method, Hydrolysis

MSC2000: 

  • O643