Scalable Purification of Boron Nitride Nanotubes via Wet Thermal Etching
Scalable Purification of Boron Nitride Nanotubes via Wet Thermal Etching
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DOI：
10.1021/acs.chemmater.8b03785
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发表时间：
2019-03-12
影响因子：
8.6
通讯作者：
Pasquali, Matteo
中科院分区：
文献类型：
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作者：
Marincel, Daniel M.;Adnan, Mohammed;Pasquali, Matteo
氮化硼纳米管（BNNT）有望填补电绝缘，高温，高强度的利基。尽管在过去的二十年中取得了重大进展，但BNNT的合成量和质量还不够高，无法用于工程应用。使BNNT可用于研究和应用的下一个必要步骤是提高高质量BNNT的可用性。在这里，我们提出了一种可扩展的批量纯化技术，产生高纯度的BNNT。在高温下将本体合成的材料引入湿氧环境中以除去元素硼和六方氮化硼杂质，纯化的BNNT的最终产率接近10重量%。通过扫描电子显微镜（SEM）、低温透射电子显微镜（TEM）和高分辨率TEM观察，该过程显示杂质完全去除。X射线光电子能谱（XPS）和红外光谱显示最小的BNNT功能化，而高分辨率TEM显示大直径BNNT的损坏。
Boron nitride nanotubes (BNNT) are poised to fill an electrically insulating, high-temperature, high strength niche. Despite significant progress over the past two decades, BNNTs are not yet synthesized in high enough quantity and quality to permit their use in engineering applications. The next necessary step to make BNNTs accessible for research and applications is to improve the availability of high-quality BNNTs. Here, we present a scalable bulk purification technique that yields high-purity BNNTs. Bulk synthesized material is introduced to a wet oxygen environment at elevated temperatures to remove elemental boron and hexagonal boron nitride impurities with a final yield of purified BNNTs near 10 wt %. This process shows full removal of impurities, as observed by scanning electron microscopy (SEM), cryogenic transmission electron microscopy (TEM), and high-resolution TEM. X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy show minimal BNNT functionalization, while high-resolution TEM shows damage to large-diameter BNNTs.