Kumabe Yoshitaka, Taga Hitomi, Kan Kai, Ohtani Masataka, Kobiro Kazuya
School of Environmental Science and Engineering, Kochi University of Technology 185 Miyanokuchi, Tosayamada, Kami Kochi 782-8502 Japan
Laboratory for Structural Nanochemistry, Kochi University of Technology 185 Miyanokuchi, Tosayamada, Kami Kochi 782-8502 Japan.
RSC Adv. 2020 Apr 13;10(25):14630-14636. doi: 10.1039/d0ra01704c. eCollection 2020 Apr 8.
Submicron-sized niobia (NbO) porous spheres with a high specific surface area (300 m g) and nano concave-convex surfaces were synthesized a rapid one-pot single-step alcothermal reaction. Prolonged reaction time or high reaction temperatures resulted in a morphology change of NbO from amorphous sphere to rod crystals with hexagonal crystal phase. A similar alcothermal reaction yielded TiO-NbO composite porous spheres, whose Ti : Nb molar ratio was controlled by changing the precursor solution component ratios. A simple thermal treatment of amorphous TiO-NbO porous spheres consisting of 1 : 2 (molar ratio) Ti : Nb at 600 °C for 2 h induced crystal phase transfer from amorphous to a monoclinic crystal phase of submicron-sized TiNbO porous spheres with a specific surface area of 50 m g.
通过快速的一锅单步醇热反应合成了具有高比表面积（300 m²/g）和纳米凹凸表面的亚微米级铌氧化物（NbO）多孔球体。延长反应时间或提高反应温度会导致NbO的形态从非晶态球体转变为具有六方晶相的棒状晶体。类似的醇热反应产生了TiO-NbO复合多孔球体，其Ti:Nb摩尔比通过改变前驱体溶液的成分比例来控制。对由1:2（摩尔比）的Ti:Nb组成的非晶态TiO-NbO多孔球体在600°C下进行2小时的简单热处理，会导致晶体相从非晶态转变为比表面积为50 m²/g的亚微米级TiNbO多孔球体的单斜晶相。
