We report an oxide nanowire growth phenomenon that morphologically resembles the vapor-liquid-solid process but with a fundamentally different mechanism. This is demonstrated with the high-temperature NiAl oxidation that results in the unidirectional γ-Al₂O₃ growth with a NiO nanoparticle at the nanowire tip. The NiO nanoparticle surface serves as the active site for dissociative O₂ adsorption that produces an inward flux of atomic oxygen toward the γ-Al₂O₃/NiAl interface for γ-Al₂O₃ growth by reacting with bottom-up diffusing Al³⁺ cations. The nanowire lengthening follows the parabolic kinetics with the upward lattice diffusion of Al³⁺ cations in the γ-Al₂O₃ nanowires as the rate-limiting factor.

我们报告了一种氧化物纳米线生长现象，其形态类似于气-液-固过程，但具有根本不同的机制。这通过高温 NiAl 氧化得到证明，该氧化导致单向 γ-Al ₂ O ₃生长，纳米线尖端处有 NiO 纳米颗粒。NiO 纳米颗粒表面用作离​​解 O ₂吸附的活性位点，通过与自下而上扩散的 Al ^{3反应产生朝向 γ-Al} ₂ O ₃ /NiAl 界面的原子氧向内通量，用于 γ-Al ₂ O _3生长⁺阳离子。纳米线的延长遵循抛物线动力学，其中γ-Al ₂ O _{3纳米线中Al} ³⁺阳离子的向上晶格扩散作为限速因子。