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本文采用KMnO_4在不同酸溶液中的氧化还原反应,合成MnO_2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,KMnO_4在无机酸(H_2SO_4,HCl和HNO_3)和有机酸(C_2H_4O_2)中发生反应均能制备MnO_2纳米材料;通过调节溶液pH值和反应温度等参数可以控制MnO_2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-MnO_2微球,而在高温和较高酸浓度条件下,可制备出一维α-MnO_2单晶纳米棒.同时对在这些不同反应系统中制备MnO_2纳米材料的反应机理进行了研究.
In this paper, the MnO 2 nanostructures were synthesized by the redox reaction of KMnO 4 in different acid solutions. The crystal structure, morphology and microstructure of the samples were characterized by XRD and HRTEM. The results showed that the oxidation of KMnO 4 in H 2 SO 4, HCl and HNO 3 ) And organic acids (C_2H_4O_2) can be prepared MnO_2 nanomaterials; by adjusting the pH and reaction temperature and other parameters can control the morphology and crystal structure of MnO 2; at low temperatures and lower acid concentration conditions, the layered fold Structure of δ-MnO_2 microspheres, and the one-dimensional α-MnO_2 single crystal nanorods can be prepared under high temperature and high acid concentration.Meanwhile, the reaction mechanism of preparing MnO_2 nanomaterials in these different reaction systems was studied .