近日，北京科技大学王荣明团队报道了在二硫化钼化学气相沉积过程中形成的原子分辨二维非晶核。相关论文于2026年2月5日发表在《科学》杂志上。

对二维材料成核与生长过程的调控是实现其规模化制备的关键。

研究组通过环境透射电子显微镜，在化学气相沉积过程中对二硫化钼的成核与生长进行了原位原子尺度观测。结合分子动力学模拟，观测发现初始成核阶段会形成二维非晶结构，当达到临界尺寸时，该结构会经历面内有序化转变形成晶核。

研究组进一步捕捉到早期生长阶段的晶核融合与定向附着过程，这些过程可能有助于二维单晶制备。上述发现揭示了化学气相沉积条件下二硫化钼成核与生长的原子尺度结构演化规律，为高质量二维晶体的可控合成提供了机制性见解，并为共价键材料体系的制备策略提供了更广阔的思路。

附：英文原文

Title: Atomically resolved two-dimensional amorphous nuclei formed during MoS2 chemical vapor deposition

Author: Huanyu Ye, Chongteng Wu, Duanyun Cao, Guorui Zhang, Yinghui Sun, Yuchen Zhu, Feng Wu, Zhihong Zhang, Rongming Wang

Issue&Volume: 2026-02-05

Abstract: Control over the nucleation and growth of two-dimensional (2D) materials is essential for their scalable manufacturing. We report in situ atomic-scale observations of molybdenum disulfide (MoS2) nucleation and growth through chemical vapor deposition (CVD) using environmental transmission electron microscopy. Coupled with molecular dynamics simulations, our observations reveal the formation of a 2D amorphous structure at the initial nucleation stage, which undergoes an in-plane structural ordering transition into a crystalline nucleus once a critical size is reached. We further captured nuclei merging and oriented attachment processes in the early growth stage, which likely contributed to 2D single-crystal fabrication. These findings unveil the atomistic structural evolution in MoS2 nucleation and growth under CVD condition, providing mechanistic insight for the controlled synthesis of high-quality 2D crystals and informing broader strategies for covalently bonded material systems.

DOI: adz8243

Source: https://www.science.org/doi/10.1126/science.adz8243