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In Situ Self‐Assembly of Nanoscale Particles into Macroscale Ordered Monolayers with Enhanced Memory Performance

Li, Wang; Sun, Ke; Yang, Lisong; Mao, Xi; Deng, Shuai; Jiang, Hui; Gu, Pan; Cao, Bowen; Li, Wen; Yi, Mingdong; Bain, Colin D.; Deng, Renhua; Zhu, Jintao

In Situ Self‐Assembly of Nanoscale Particles into Macroscale Ordered Monolayers with Enhanced Memory Performance Thumbnail


Authors

Wang Li

Ke Sun

Xi Mao

Shuai Deng

Hui Jiang

Pan Gu

Bowen Cao

Wen Li

Mingdong Yi

Renhua Deng

Jintao Zhu



Abstract

In situ fabrication of macroscale ordered monolayers of nanoparticles (NPs) on targeted substrates is highly desirable for precision electronic and optical devices, while it remains a great challenge. In this study, a solution is provided to address this challenge by developing a colloidal ink formulation and employing the direct-ink-writing (DIW) technique, where on-demand delivery of ink at a targeted location and directional evaporation with controllable rate are leveraged to precisely guide the deposition of polystyrene-grafted gold NPs (Au@PS NPs) into a macroscale monolayer with an ordered Au NP array embedded in a PS thin film. A 2D steady-state diffusion-controlled evaporation model, which explains the parameter dependence of the experimental results and gives semiquantitative agreement with the experimental evaporation kinetics is proposed. The ordered monolayer is used as both nanocrystal floating gates and the tunneling layer for nonvolatile memory devices. It shows significantly enhanced performance compared with a disordered NP film prepared by spin coating. This approach allows for fine control of NP self-assembly to print macroscaleordered monolayers directly onto substrates, which has great promise for application in broad fields, including microelectronic and photoelectronic devices, sensors, and functional coatings.

Journal Article Type Article
Online Publication Date Dec 23, 2022
Publication Date Mar 15, 2023
Deposit Date Jan 16, 2023
Publicly Available Date Dec 24, 2023
Journal Small
Print ISSN 1613-6810
Electronic ISSN 1613-6829
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 29
Issue 11
Article Number 2207468
DOI https://doi.org/10.1002/smll.202207468
Public URL https://durham-repository.worktribe.com/output/1181736

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