Abstract
Prediction and design of various nanomaterials is a long-term dream in nanoscience and nanotechnology, which depends on the deep understanding on the growth mechanism. Herein, we report the successful prediction on the growth of AlN nanowires by nitriding Al69Ni31 alloy particles across the liquid-solid (β) phase region (1133–1638°C) based on the phase-equilibrium-dominated vapor-liquid-solid (PED-VLS) mechanism proposed in our previous study. All predictions about the growth of AlN nanowires, the evolutions of lattice parameters and geometries of the coexisting Al-Ni alloy phases are experimentally confirmed quantitatively. The preconditions for the applicability of the PED-VLS mechanism are also clarified. This progress provides the further evidence for the validity of the PED-VLS mechanism and demonstrates a practical guidance for designing and synthesizing different nanomaterials according to corresponding phase diagrams based on the insight into the growth mechanism.
摘要
纳米材料的预测和设计是纳米科学与技术领域的长期梦想, 该梦想的实现有赖于对生长机理的深刻理解. 本文基于我们前期研究揭示 的相平衡主导的气-液-固(VLS)生长机理, 成功地预测了在1133~1638°C温区内通过氮化Al69Ni31合金颗粒生长AlN纳米线的过程, 有关AlN纳米 线的生长、共存Al-Ni合金相的晶格参数及形貌演变等预测均得到了定量化实验结果的证实, 并界定了相平衡主导的VLS生长机理的适用条件. 本文为相平衡主导的VLS生长机理的有效性提供了进一步的实验证据, 同时展示了在生长机理的指导下根据相图设计和制备纳米材料的一个 实例.
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Yongliang Zhang is currently a lecturer at Hefei University of Technology, China. He obtained his BSc degree (2008) in applied chemistry from Nanjing University of Information Science & Technology, and PhD degree (2015) in chemistry from Nanjing University. His research interests focus on the design and field emission property of one-dimensional nanostructures.
Qiang Wu is currently a professor at the School of Chemistry and Chemical Engineering, Nanjing University, China. He obtained his BSc (1999) and PhD (2004) degrees in chemistry from Nanjing University. His research interests focus on the rational design of nano- and meso-structured materials and their applications in field emission, energy storage, and electrocatalysis.
Zheng Hu is currently a Cheung Kong Scholar professor at the School of Chemistry and Chemical Engineering, Nanjing University, China. He received his BSc (1985) and PhD (1991) degrees in physics from Nanjing University. He is the owner of the highly competitive NSFC fund for outstanding young scientists of China (2005). His current research interests focus on physical chemistry and materials chemistry addressing the growth mechanism, materials design and energy applications of a range of nano- and meso-structured materials.
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Zhang, Y., Cai, J., Wu, Q. et al. Phase-equilibrium-dominated vapor-liquid-solid mechanism: further evidence. Sci. China Mater. 59, 20–27 (2016). https://doi.org/10.1007/s40843-016-0111-4
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DOI: https://doi.org/10.1007/s40843-016-0111-4