不同酸溶液中制备纳米结构MnO₂单晶

来源期刊：金属学报2010年第7期

论文作者：陈永 洪玉珍 马艳平 杨昊 李建保

文章页码：857 - 861

关键词：MnO₂； 纳米结构； 氧化还原反应

Key words：MnO₂； nanostructures； redox reaction

摘    要：本文采用KMnO₄在不同酸溶液中的氧化还原反应,合成MnO₂纳米结构,利用XRD和HRTEM对样品的晶体结构、形貌和微观结构进行表征分析.结果表明,KMnO₄在无机酸(H₂SO₄,HCl和HNO₃)和有机酸(C₂H₄O₂)中发生反应均能制备MnO₂纳米材料;通过调节溶液pH值和反应温度等参数可以控制MnO₂形貌和晶体结构;在低温和较低酸浓度条件下,得到层状褶皱结构的δ-MnO₂微球,而在高温和较高酸浓度条件下,可制备出一维α-MnO₂单晶纳米棒.同时对在这些不同反应系统中制备MnO₂纳米材料的反应机理进行了研究.

Abstract: Nanostructure MnO₂ single crystal was prepared through redox reactions of potassium permanganate in different inorganic acid (hydrochloric acid,sulfuric acid and nitric acid) and organic acid (acetate).The products were characterized by TEM and XRD.It indicated that the crystal structure and morphology of the synthesized MnO₂ can be tailored by adjusting the pH value in solution and reaction temperature.It was also found that layer folded δ-MnO₂ microspheres were obtained at low reaction temperature and low hydrochloric acid concentration,whereas α-MnO₂ single-crystal nanorods were fabricated with increased reaction temperature and hydrochloric acid concentration. The possible formation mechanism of δ-MnO₂ microspheres and α-MnO₂ nanorods is also discussed.