Bi3.25La0.75Ti3O12纳米管的制备工艺研究

Synthesis of Bi3.25La0.75Ti3O12 Nanotubes

摘要:

研究了一种Bi3.25La0.75Ti3O12 (BLT)铁电存储材料纳米管的简单有效合成方法。通过阳极氧化铝模板(AAO)辅助溶胶凝胶法，合成了BLT纳米管。其基本过程是以次硝酸铋、硝酸镧和钛酸四丁酯为原料，以冰醋酸和乙二醇甲醚为溶剂配制BLT溶胶，然后将BLT溶胶滴在AAO模板表面，浸润后烘干并反复多次，而后将材料在500 ℃下保温1 h，除去有机物，最后在750 ℃下保温30 min晶化，用KOH腐蚀去除氧化铝模板，即得到BLT纳米管。结果表明，BLT纳米管具有[117]择优取向；BLT纳米管管壁光滑，直径与模板孔径相当，约300 nm，且分布均匀，管壁厚度约25 nm，纳米管是多晶体，由粒径为8~12 nm晶粒组成

Abstract:

Bi3.25La0.75Ti3O12 (BLT) nanotubes were synthesized by dipping BLT sol precursor into an anodic aluminum oxide template (AAO). The results indicate that using 4BiNO3(OH)2×BiO(OH), La(NO3)3×6H2O and Ti(C4H9O)4 as starting materials, stable BLT sol can be prepared with solvent of acetic acid and ethylene glycol monomethyl ether. Pure perovskite BLT can be synthesized after calcining the gel that comes from sol with acetic acid and ethylene glycol monomethyl ether as solvent at 500 °C for 1 h and 750 °C for 30 min. BLT nanotubes are stacks of BLT polycrystalline of 8~12 nm and they have a wall thickness of 25 nm and diameter of 300 nm