Atomic scale in-situ observation of gas-solid interaction regulating the pre-nucleation process of Pd atomic clusters

IF 13.2 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Today Pub Date : 2024-10-30 DOI:10.1016/j.nantod.2024.102533
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Abstract

Advancements in nanotechnology have propelled the understanding of atomic-scale nucleation processes, essential for the evolution of atomic manufacturing. The process of amorphous precursors nucleation showcases a complex transition influenced by various factors. Utilizing aberration-corrected ETEM and theoretical calculation, we explore the nucleation of amorphous Pd atomic clusters. This study examines the nucleation dynamics and gas-solid interaction regulating of Pd clusters on ultrathin carbon films, prepared via electron beam evaporation. HRTEM observation and FFT analysis reveal that, in the early stage of nucleation, Pd cluster growth predominantly follows an Ostwald ripening-like mechanism. Atoms from smaller clusters migrate and attach to larger ones, facilitating their progression to critical nucleation size. Environmental conditions significantly influence this process; hydrogen atmospheres lower the surface energy of Pd clusters, reducing the critical nucleation size, while argon atmospheres impede growth of Pd clusters by occupying migration sites on the carbon surface. These insights into atomic cluster behavior and environmental interactions are crucial for understanding the early stages of nucleation from amorphous to crystalline and can help opens new avenues for the controlled fabrication of materials with optimized functionalities.
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原子尺度原位观测调节钯原子团簇预成核过程的气固相互作用
纳米技术的进步推动了对原子尺度成核过程的了解,这对原子制造业的发展至关重要。非晶前驱体的成核过程展示了受各种因素影响的复杂转变。利用像差校正 ETEM 和理论计算,我们探索了非晶钯原子簇的成核过程。本研究探讨了电子束蒸发法制备的超薄碳膜上钯原子簇的成核动力学和气固相互作用调控。HRTEM 观察和 FFT 分析表明,在成核的早期阶段,钯簇的生长主要遵循类似奥斯特瓦尔德熟化的机制。较小簇团中的原子迁移并附着到较大的簇团上,促进它们向临界成核尺寸发展。环境条件会对这一过程产生重大影响;氢气环境会降低钯簇的表面能,从而减小临界成核尺寸,而氩气环境则会占据碳表面的迁移位点,从而阻碍钯簇的生长。这些关于原子团簇行为和环境相互作用的见解对于理解从无定形到晶体成核的早期阶段至关重要,有助于为控制制造具有优化功能的材料开辟新的途径。
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来源期刊
Nano Today
Nano Today 工程技术-材料科学:综合
CiteScore
21.50
自引率
3.40%
发文量
305
审稿时长
40 days
期刊介绍: Nano Today is a journal dedicated to publishing influential and innovative work in the field of nanoscience and technology. It covers a wide range of subject areas including biomaterials, materials chemistry, materials science, chemistry, bioengineering, biochemistry, genetics and molecular biology, engineering, and nanotechnology. The journal considers articles that inform readers about the latest research, breakthroughs, and topical issues in these fields. It provides comprehensive coverage through a mixture of peer-reviewed articles, research news, and information on key developments. Nano Today is abstracted and indexed in Science Citation Index, Ei Compendex, Embase, Scopus, and INSPEC.
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