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采用天然高分子海藻酸钠为原料,以氯化锌水溶液为凝固浴,通过湿法纺丝技术成功制备了海藻酸锌(Alg-Zn)纤维.通过在空气中不同温度下对所得海藻酸锌纤维进行热处理,得到了多种ZnO纳米结构.利用热失重分析(TG)、X射线衍射(XRD)、电子能量损失谱(EELS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)等手段对产物的组成、形貌和微观结构进行了详细表征.结果表明,焙烧温度和时间对所得ZnO纳米结构的尺寸和形貌具有重要影响;800℃下热处理24h以上可以得到直径约为120nm的ZnO纳米棒.通过仔细考察不同热处理时间得到的ZnO纳米结构,提出了在焙烧条件下ZnO纳米棒的生长机理.
Zinc alginate (Alg-Zn) fibers were successfully prepared by wet spinning using natural polymer sodium alginate as raw material and zinc chloride aqueous solution as coagulation bath.The zinc alginate The fiber was heat-treated to obtain a variety of ZnO nanostructures.We used TG, XRD, EELS, SEM, TEM, The structure, morphology and microstructure of the product were characterized by HRTEM and SEM.The results showed that the calcination temperature and time had an important influence on the size and morphology of the obtained ZnO nanostructures. After heat treatment at 800 ℃ for 24h The ZnO nanorods with the diameter of about 120nm can be obtained.The growth mechanism of the ZnO nanorods under the calcination conditions was proposed by carefully examining the ZnO nanostructures obtained at different heat treatment times.