Ran Yutong, Zhao Runni, Meng Chen, Shang Nianze, Sun Shuo, Liu Kaihui, Zhu Hongwei
State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China.
Small. 2024 Jan;20(4):e2304511. doi: 10.1002/smll.202304511. Epub 2023 Sep 15.
The use of non-equilibrium growth modes with non-steady dynamics is extensively explored in bulk materials such as amorphous and polycrystalline materials. Yet, research into the non-steady-state (NSS) growth of two-dimensional (2D) materials is still in its infancy. In this study, multilayered tin selenide (SnSe ) nanoplates are grown by chemical vapor deposition under NSS conditions (modulating carrier gas flow and temperature). Given the facile diffusion and inherent instability of SnSe , it proves to be an apt candidate for nucleation and growth in NSS scenarios. This leads to the emergence of SnSe nanoplates with distinct features (self-growth twisting, symmetry transformation, interlayer decoupling, homojunction, and large-area 2D domain), exhibiting pronounced second harmonic generation. The authors' findings shed light on the growth dynamics of 2D materials, broadening their potential applications in various fields.
在诸如非晶态和多晶材料等块状材料中，对具有非稳定动力学的非平衡生长模式进行了广泛探索。然而，二维（2D）材料的非稳态（NSS）生长研究仍处于起步阶段。在本研究中，通过化学气相沉积在NSS条件下（调节载气流量和温度）生长多层硒化锡（SnSe）纳米片。鉴于SnSe易于扩散且具有固有不稳定性，它被证明是NSS场景中成核和生长的合适候选材料。这导致出现具有独特特征（自生长扭曲、对称转变、层间解耦、同质结和大面积二维畴）的SnSe纳米片，表现出明显的二次谐波产生。作者的研究结果揭示了二维材料的生长动力学，拓宽了它们在各个领域的潜在应用。
