Formation Mechanism of Well-Ordered Densely Packed Nanoparticle Superlattices Deposited from Gas Phase on Template-Free Surfaces

Nanoscale Research Letters

Sishi Zhang¹  Lianhua Zhang²  Chang Liu³  Fei Liu³  Min Han³  Chen Jin³ 

[1] Department of Materials Science and Engineering and Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, 210093, Nanjing, China;National Laboratory of Solid State Microstructures and Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, 210093, Nanjing, China;National Laboratory of Solid State Microstructures and Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, 210093, Nanjing, China;Department of Materials Science and Engineering and Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, 210093, Nanjing, China;

关键词: Ordered nanocluster monolayer;    Gas-phase cluster deposition;    Self-assembling;    Densely packed;    Surface migration;    Attractive interaction;   

DOI  :  10.1186/s11671-021-03635-7

来源: Springer

【 摘 要 】

Superlattices of nanoparticles are generally produced based on solution chemistry processes. In this paper, we demonstrate that self-assembled monolayer structures of nanoparticles with superlattice periodicities can also be produced on template-free surfaces in the gas-phase cluster beam deposition process. It is found that the packing of Fe nanoparticles corresponds to an average of two-dimensional densely packed lattice with a hexagonal summary. By controlling the nanoparticle coverage, the two-dimensional densely packed monolayer morphology can spread to the whole substrate surface being deposited. A formation mechanism of the ordered monolayers is proposed. The densely packed morphologies are formed by the balance between the diffusion rate of the nanoparticles and their filling speed on the substrate surface determined by the deposition rate, and the ordering of the nanoparticle arrays is driven by the inter-particle attractive interactions. The model is strongly supported by a series of carefully designed cluster deposition experiments.

【 授权许可】

CC BY