Yang Gang, Hu Peng, Cao Yuebin, Yuan Fangli, Xu Ruifen
Nanoscale Res Lett. 2010 Jun 3;5(9):1437-1441. doi: 10.1007/s11671-010-9658-2.
In this work, porous TiO(2) hollow spheres with an average diameter of 100 nm and shell thickness of 20 nm were synthesized by a facile hydrothermal method with NH(4)HCO(3) as the structure-directing agent, and the formation mechanism for this porous hollow structure was proved to be the Ostwald ripening process by tracking the morphology of the products at different reaction stages. The product was characterized by SEM, TEM, XRD and BET analyses, and the results show that the as-synthesized products are anatase phase with a high surface area up to 132.5 m(2)/g. Gas-sensing investigation reveals that the product possesses sensitive response to methanal gas at 200 degrees C due to its high surface area.
在本工作中，以NH₄HCO₃作为结构导向剂，通过简便的水热法合成了平均直径为100 nm、壳厚度为20 nm的多孔TiO₂空心球，并通过追踪不同反应阶段产物的形貌，证明了这种多孔空心结构的形成机制为奥斯特瓦尔德熟化过程。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和比表面积分析（BET）对产物进行了表征，结果表明，所合成的产物为锐钛矿相，比表面积高达132.5 m²/g。气敏研究表明，由于其高比表面积，该产物在200℃时对甲醛气体具有灵敏的响应。
