摘要
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 obtained by wet spinning of sodium alginate （Alg-Na） into a coagulating bath containing an aqueous zinc chloride solution. ZnO nanostructures were prepared by thermal degradation of the asobtained zinc alginate fibers at different temperatures in air. The compositions, morphologies, and microstructures of products were investigated by thermal gravimetry （TG）, X-ray diffraction （XRD）, electron energy-loss spectroscopy （EELS）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and high-resolution transmission electron microscopy （HRTEM）. Annealing time and temperature influenced final structures and shapes of ZnO nanostructures. ZnO nanorods with diameters of about 120 nm were obtained at 800 ℃ and with a reaction time of more than 24 h in air. A ZnO growth mechanism was proposed by a careful investigation of ZnO nanostructures after different thermal treatment times.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第12期2179-2184,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(50673046,50730005)
科技部重大基础研究前期研究专项基金(2006CB708603)资助项目
