Erbium arsenide nanoparticles (ErAs NPs) grown using a two-step modified diffusion length growth process are studied. The process consists of a low diffusion length (LDL) deposition step for nucleation followed by a high diffusion length (HDL) deposition step for the growth of existing nuclei without forming new nuclei. With the LDL and HDL growth conditions properly coordinated, independent control over the NP size is demonstrated over a wide range of NP densities (14–309 NP/μm²). This control is attributed to the change of Péclet number between the LDL and HDL steps, which enables complete capture of the adatoms by the existing nuclei. The appropriate LDL and HDL growth conditions are identified for practical applications of the process. Given the uniqueness of the process, the ErAs nucleus critical size (∼7 Er atoms) is derived in the nucleation regime in the LDL step exhibiting consistency with the previous observation for ErAs NP growth.

中文翻译：

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两步修正扩散长度法生长的ErAs纳米颗粒表面分析

研究了使用两步改进的扩散长度生长工艺生长的砷化nanoparticles纳米颗粒（ErAs NPs）。该过程包括用于成核的低扩散长度（LDL）沉积步骤，然后是用于在不形成新核的情况下生长现有核的高扩散长度（HDL）沉积步骤。随着LDL和HDL的生长条件适当地协调，独立控制在所述NP尺寸被证明在宽范围的NP密度（14-309 NP / μ米²）。这种控制归因于LDL和HDL步骤之间Péclet数的变化，从而可以通过现有原子核完全捕获吸附原子。确定适当的LDL和HDL生长条件以用于该过程的实际应用。鉴于该过程的独特性，在LDL步骤的成核方案中得出了ErAs核的临界尺寸（约7个Er原子），与先前对ErAs NP生长的观察一致。