文章信息

SnO₂ hollow microspheres are synthesized through facile one-pot solution phase method by using SnCl₄ center dot 5H₂O as precursor. The shell thickness of the microsphere is about 110 nm. The spherical morphology is stable enough to survive long ultrasonication treatment. Time-dependent growth experiments are conducted to reveal the morphology evolution of SnO₂ microspheres. It is found that the presence of methenamine is essential to the formation of SnO₂ hollow microspheres from a self-assembly of nanoparticles. One possible formation mechanism of the SnO₂ hollow microspheres is proposed based on the Ostwald ripening mechanism. The as-synthesized SnO₂ microspheres exhibit a good gas response to alcohol vapor, demonstrating their potential application as gas sensor.