氮化硼纳米管(BNNTs)是一种新型氮化硼纳米材料,具有广泛的应用前景。不同形态BNNTs具有不同应用领域。研究BNNTs形貌形成机理对于制备不同形态BNNTs具有重要意义。以B2O3为原料,通过球磨退火法制备了BNNTs。设计实验观察了不同生长条件下产物的形貌,并据此分析了BNNTs的生长过程及形貌形成机理。结果表明:BNNTs形成之初为纳米片结构,随着反应进行,纳米片逐渐卷曲形成中空的帽子或胶囊状结构,这些帽子或胶囊状结构连接在一起形成了纳米管。因而大多数BNNTs为竹节结构,这些帽子或胶囊即为组成纳米管的单个竹节。面积较小的纳米片形成较小的竹节结构,多个小竹节连接在一起形成竹节密集,轴向间距小的纳米管。面积较大的纳米片形成较长的竹节结构,多个竹节连接在一起形成竹节间距大的纳米管。其在透射电镜高倍视野观察时可能看不到竹节,被认为是圆柱状结构。由单个纳米片卷曲形成单独的一根圆柱状纳米管的情况也会出现。
Boron nitride nanotubes (BNNTs) are a new type of boron nitride nanomaterial with broad application prospects.Different BNNT morphologies have different application fields.Studying the formation mechanisms of BNNT morphologies is of great significance for the preparation of BNNTs with different morphologies.B2O3 was used as the raw material to prepare BNNTs through ball milling and annealing process.Experiments were conducted to observe the morphology of products under different growth conditions.The growth process and morphology formation mechanism of BNNTs were analyzed based on the experimental phenomenon.It was found that BNNTs were nanosheet structures at the beginning of the formation.As the reaction progressed,the nanosheets gradually curled up to form hollow caps or capsule-like structures,which were connected together to form nanotubes.Therefore,most BNNTs had a bamboo node structure,and these caps or capsules were the individual bamboo nodes that make up the nanotubes.The smaller nanosheets formed smaller bamboo node structures,and multiple small bamboo nodes were connected together to form nanotubes with dense bamboo nodes and small axial spacing.Larger nanosheets formed longer bamboo nodes,and multiple bamboo nodes were connected together to form nanotubes with large inter node spacing.The bamboo nodes might not be visible under high-magnification TEM observation and might be regarded as cylindrical structure.The situation where a single nanosheet was curled to form a single cylindrical nanotube might also occur.
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基金资助
陕西省自然科学基础研究计划青年项目(2024JC-YBQN-0425)
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