Effects of raw materials on NaNbO3 nanocube synthesis via the solvothermal method
Effects of raw materials on NaNbO3 nanocube synthesis via the solvothermal method
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DOI：
10.1080/21870764.2018.1559913
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发表时间：
2019-01-02
影响因子：
2.3
通讯作者：
Kakihana, Masato
中科院分区：
文献类型：
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作者：
Nakashima, Kouichi;Toshima, Yasuharu;Kakihana, Masato
纳米立方体是具有立方体形状的单个纳米级晶体。原料是决定纳米立方体合成的重要因素。在这项研究中，我们研究了各种铌化合物，作为原料，每一个诱导不同的影响，在纳米立方体合成。采用两步法合成了过氧铌酸钠（NaNbO3）纳米立方体。在这个过程中的第一步，原料的合成，其次是溶剂热合成的NaNbO3纳米立方体。通过在Nb水解之后对前体施加热处理来获得用于第一步骤的原料。热处理在300 - 1000 ℃的温度下进行。Nb_2O_5的前体经过热处理后得到，在此过程中，随着温度的升高，其晶体系统变成六方晶系，正交晶系和单斜晶系。对于第二步，我们获得了各种NaNbO3的形貌通过溶剂热法使用水，甲醇，或乙醇作为反应介质。通过在800 ℃热处理期间将溶剂热方法应用于合成的前体来形成NaNbO3纳米立方体。以甲醇为反应介质，在200 ℃下进行溶剂热合成，从而形成NaNbO3纳米立方体。
A nanocube is a single nanoscale crystal with a cubic shape. Raw materials are an important factor in determining the synthesis of nanocubes. In this study, we investigated various niobium compounds that serve as raw materials, each inducing different effects during nanocube synthesis. Perovskite sodium niobate (NaNbO3) nanocubes were synthesized using a two-step process. The first step in this process, synthesis of the raw materials, was followed by solvothermal synthesis of NaNbO3 nanocubes. The raw material for the first step was obtained by applying heat treatment to a precursor following Nb hydrolysis. The heat treatment was performed at temperatures of 300-1000 degrees C. Nb2O5 was obtained after heat treatment of its precursor, during which its crystalline system morphed into hexagonal, orthorhombic, and monoclinic systems with respective increases in temperature. For the second step, we obtained various NaNbO3 morphologies via the solvothermal method using water, methanol, or ethanol as a reaction medium. NaNbO3 nanocubes were formed by applying the solvothermal method to the synthesized precursor during heat treatment at 800 degrees C. Solvothermal synthesis was performed with methanol as the reaction medium at 200 degrees C, which resulted in the formation of NaNbO3 nanocubes.