迈向催化剂介导的金刚石和立方氮化硼线状晶体生长
Toward catalyst-mediated growth of diamond and cubic boron nitride wires
- Institute for Basic Science (IBS)（韩国基础科学研究所）
- UNIST（蔚山科学技术院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
针对金刚石和立方氮化硼线状晶体缺乏可重复催化剂介导生长方法的问题，提出VLS和VSS路线，通过切换起始材料、沉积催化剂等策略，探索金刚石-金属接触以促进四面体键合，实现单晶或多晶线状生长。
AI中文摘要：
目前尚未建立一种可重复的方法来实现催化剂介导的金刚石和立方氮化硼（cBN）线状晶体的持续生长。催化剂辅助生长已成功制备出碳纳米管、氮化硼纳米管以及多种元素、化合物和合金纳米线。金刚石和cBN线状晶体有望兼具高比刚度和强度，同时具备热传导和电绝缘性能。我提出了气-液-固（VLS）和气-固-固（VSS）生长路线，其中在第一个金刚石或cBN段形成及其后续生长之间，温度、原料、催化剂或起始接触方式会发生变化。这些方法包括从碳化物或富硼起始线切换，在现有晶体的选定晶面上沉积催化剂，以及在初始生长期间利用局部固态原料为催化剂提供供应。历史上的金刚石晶须研究报道促使重新测试金刚石-金属接触。所提出的实验旨在探究这些接触是否能在维持生长中晶体原子供给的同时，促进四面体键合。无论是单晶还是多晶产物，从纳米级到微米级及更大直径，均具有研究价值。
英文摘要：
A reproducible method for sustained catalyst-mediated growth of diamond and cubic boron nitride (cBN) wires has yet to be established. Catalyst-assisted growth has produced carbon and boron nitride nanotubes and a wide range of elemental, compound and alloy nanowires. Diamond and cBN wires could combine high specific stiffness and strength with heat conduction and electrical insulation. I propose vapor-liquid-solid (VLS) and vapor-solid-solid (VSS) routes in which temperature, feed, catalyst or starting contact changes between formation of the first diamond or cBN segment and its continued growth. The approaches include switching from carbide or boron-rich starter wires, depositing catalyst on selected facets of existing crystals, and using local solid feedstock to supply the catalyst during initial growth. Historical diamond-whisker reports motivate renewed tests of diamond-metal contacts. The proposed experiments ask whether these contacts can favor tetrahedral bonding while maintaining a supply of atoms to the growing wire. Both single-crystal and polycrystalline products, from nanometer to micrometer and larger diameters, are of interest.
