电子辐照诱发固态相变导致的氮化硼纳米结构生长

Boron nitride nanostructures grown through irradiation-induced solid-state phase transformation

报道了N+离子轰击产生的氮化硼 (BN)纳米结构 ,及在电子辐照时结构演化的高分辨透射电子显微镜的原位测定结果 .应当强调的是 ,这种类 富勒烯和发夹结构的演化 ,实际上是电子辐照诱发固态相变的发展 ,观察中发现的一些BN颗粒、卷曲物 ,可以被认为是类 富勒烯等纳米结构形成的前体或早期阶段 .提出了一种类 富勒烯等结构的电子辐照动力学模型 ,并进行了讨论 .

We report on an in-situ study of structure evolution by electron irradiation in a high-resolution transmission electron microscope.The starting material is a nanostructured BN sample produced by N + ion bombardment.It should be emphasized that both fullerence-like and hairpin-like structures are a result of electron irradiation-induced solid-state phase transformation in the BN material.We have observed some nano-particles and curled objects that might be the precursor of initial stage of BN nanoformation.A kinetic model for electron irradiation-induced formation of the BN fullerenes and hairpins is given