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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。
A simple and effective synthesis method of Bi3.25La0.75Ti3O12 (BLT) ferroelectric memory material nanotubes was studied. BLT nanotubes were synthesized by anodic alumina template (AAO) assisted sol-gel method. The basic process is based on bismuth subnitrate, lanthanum nitrate and tetrabutyl titanate as raw materials, glacial acetic acid and ethylene glycol monomethyl ether as a solvent preparation of BLT sol, and then the BLT sol drops AAO template surface, infiltration and drying Repeated several times, then the material was incubated at 500 ℃ for 1 h to remove organic matter, and finally incubated at 750 ℃ for 30 min crystallization, KOH etching to remove the alumina template to obtain BLT nanotubes. The results show that the BLT nanotubes have a preferred orientation of [117]. The walls of the BLT nanotubes are smooth and the diameter is about 300 nm. The wall thickness of the BLT nanotubes is about 25 nm. The nanotubes are polycrystalline. 8 ~ 12 nm grain composition.