摘要
以草酸钛钾为钛源,利用一步免模板法在水热条件下制备出二氧化钛空心球,其形成机理建立在由里及外的"Ostwald ripening"理论上。在不同的反应时间下研究了二氧化钛从亚稳相逐渐向稳定相的锐钛型二氧化钛空心球转变的过程。结合SEM的观察发现二氧化钛由光滑的固态粒子逐渐转变为表面为纳米棒状的二氧化钛空心球,TEM证实了所制备的空心球的直径约为1微米,单晶衍射图案(SAED)表明棒状晶体沿[001]面生长。
TiO, hollow spheres were fabricated by template flee method under hydrotbermal condition using titanium potassium oxalate （TOP） as precursor The formation nrechanism was based on inside-out ＂Ostwald ripening＂. Phase transition from metastable phase to stable anatase TiO_, hollow spheres were investigated by different reaction time. Morphologies from smooth solid particles to nanorod like TiO2 hollow spheres are observed by scanning election microscopy （SEM）, transmission electron microscopy （TEM） results confirmed that the mean diameter of hollow spheres was 1μm, selected area electron diffraction （SAED） revealed that the nanorod grew along [001].
出处
《广东化工》
CAS
2013年第21期63-64,76,共3页
Guangdong Chemical Industry
关键词
TIO2
空心球
免模板
光催化
TiO2 hollow spheres
template free
photocatalytic
