引用本文:
孔庆山, 吴兴隆, 郭玉国, 王乙潜, 夏延致, 于建, 刘海华, 段晓峰. 海藻酸锌纤维热降解法制备氧化锌纳米结构[J]. 物理化学学报,
2008, 24(12): 2179-2184.
doi:
10.3866/PKU.WHXB20081206
Citation: KONG Qing-Shan, WU Xing-Long, GUO Yu-Guo, WANG Yi-Qian, XIA Yan-Zhi, YU Jian, LIU Hai-Hua, DUAN Xiao-Feng. Preparation of ZnO Nanostructures by Thermal Degradation of Zinc Alginate Fibers[J]. Acta Physico-Chimica Sinica, 2008, 24(12): 2179-2184. doi: 10.3866/PKU.WHXB20081206
Citation: KONG Qing-Shan, WU Xing-Long, GUO Yu-Guo, WANG Yi-Qian, XIA Yan-Zhi, YU Jian, LIU Hai-Hua, DUAN Xiao-Feng. Preparation of ZnO Nanostructures by Thermal Degradation of Zinc Alginate Fibers[J]. Acta Physico-Chimica Sinica, 2008, 24(12): 2179-2184. doi: 10.3866/PKU.WHXB20081206
海藻酸锌纤维热降解法制备氧化锌纳米结构
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24 h以上可以得到直径约为120 nm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.
English
Preparation of ZnO Nanostructures by Thermal Degradation of Zinc Alginate Fibers
Abstract:
Zinc alginate (Alg-Zn) fibers were obtained by wet spinning of sodiumalginate (Alg-Na) into a coagulating bath containing an aqueous zinc chloride solution. ZnO nanostructures were prepared by thermal degradation of the as-obtained 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.
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Key words:
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Zinc alginate fiber
- / ZnO
- / Nanorod
- / Thermal degradation
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