Heterogeneous Self-Assembly of a Single Type of Nanoparticle Modulated by Skin Formation

Chang Li; Yafeng Yu; Huizeng Li; Haisong Lin; Huanqing Cui; Yi Pan; Ruotong Zhang; Yanlin Song; Ho Cheung Shum

doi:10.1021/acsnano.3c02082

Heterogeneous Self-Assembly of a Single Type of Nanoparticle Modulated by Skin Formation

Chang Li, Yafeng Yu, Huizeng Li^*, Haisong Lin, Huanqing Cui, Yi Pan, Ruotong Zhang, Yanlin Song^*, Ho Cheung Shum^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

14 Citations (Scopus)

Abstract

Self-assembly of colloidal nanoparticles has generated tremendous interest due to its widespread applications in structural colorations, sensors, and optoelectronics. Despite numerous strategies being developed to fabricate sophisticated structures, the heterogeneous self-assembly of a single type of nanoparticle in one step remains challenging. Here, facilitated by spatial confinement induced by a skin layer in a drying droplet, we achieve the heterogeneous self-assembly of a single type of nanoparticle by quickly evaporating a colloid-poly (ethylene glycol) (PEG) droplet. During the drying process, a skin layer forms at the droplet surface. The resultant spatial confinement assembles nanoparticles into face-centered-cubic (FCC) lattices with (111) and (100) plane orientations, generating binary bandgaps and two structural colors. The self-assembly of nanoparticles can be regulated by varying the PEG concentration so that FCC lattices with homo- or heterogeneous orientation planes can be prepared on demand. Besides, the approach is applicable for diverse droplet shapes, various substrates, and different nanoparticles. The one-pot general strategy breaks the requirements for multiple types of building blocks and predesigned substrates, extending the fundamental understanding underlying colloidal self-assembly. © 2023 American Chemical Society.

Original language	English
Pages (from-to)	11645-11654
Journal	ACS Nano
Volume	17
Issue number	12
Online published	12 Jun 2023
DOIs	https://doi.org/10.1021/acsnano.3c02082
Publication status	Published - 27 Jun 2023
Externally published	Yes

Funding

This work was supported by the General Research Fund (Nos.17307919, 17306820, 17304017, and 17305518) and the Research Impact Fund (No. R7072-18) from the Research Grants Council of Hong Kong, and the Excellent Young Scientists Fund (Hong Kong and Macau) (21922816) from the National Natural Science Foundation of China (NSFC), and the National Natural Science Foundation of China (Grant No. 22272182, 52293473, 51903240), and the Youth Innovation Promotion Association of CAS (2023039). H.C.S. was funded in part by the Croucher Senior Research Fellowship from Croucher Foundation, and the Health@InnoHK programme of the Innovation and Technology Commission under the Hong Kong SAR government.

Research Keywords

droplet evaporation
heterogeneous self-assembly
Marangoni flow
photonic crystal heterojunction
skin formation
structural colors

RGC Funding Information

RGC-funded

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title = "Heterogeneous Self-Assembly of a Single Type of Nanoparticle Modulated by Skin Formation",

abstract = "Self-assembly of colloidal nanoparticles has generated tremendous interest due to its widespread applications in structural colorations, sensors, and optoelectronics. Despite numerous strategies being developed to fabricate sophisticated structures, the heterogeneous self-assembly of a single type of nanoparticle in one step remains challenging. Here, facilitated by spatial confinement induced by a skin layer in a drying droplet, we achieve the heterogeneous self-assembly of a single type of nanoparticle by quickly evaporating a colloid-poly (ethylene glycol) (PEG) droplet. During the drying process, a skin layer forms at the droplet surface. The resultant spatial confinement assembles nanoparticles into face-centered-cubic (FCC) lattices with (111) and (100) plane orientations, generating binary bandgaps and two structural colors. The self-assembly of nanoparticles can be regulated by varying the PEG concentration so that FCC lattices with homo- or heterogeneous orientation planes can be prepared on demand. Besides, the approach is applicable for diverse droplet shapes, various substrates, and different nanoparticles. The one-pot general strategy breaks the requirements for multiple types of building blocks and predesigned substrates, extending the fundamental understanding underlying colloidal self-assembly. {\textcopyright} 2023 American Chemical Society.",

keywords = "droplet evaporation, heterogeneous self-assembly, Marangoni flow, photonic crystal heterojunction, skin formation, structural colors",

author = "Chang Li and Yafeng Yu and Huizeng Li and Haisong Lin and Huanqing Cui and Yi Pan and Ruotong Zhang and Yanlin Song and Shum, {Ho Cheung}",

year = "2023",

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T1 - Heterogeneous Self-Assembly of a Single Type of Nanoparticle Modulated by Skin Formation

AU - Li, Chang

AU - Yu, Yafeng

AU - Li, Huizeng

AU - Lin, Haisong

AU - Cui, Huanqing

AU - Pan, Yi

AU - Zhang, Ruotong

AU - Song, Yanlin

AU - Shum, Ho Cheung

PY - 2023/6/27

Y1 - 2023/6/27

N2 - Self-assembly of colloidal nanoparticles has generated tremendous interest due to its widespread applications in structural colorations, sensors, and optoelectronics. Despite numerous strategies being developed to fabricate sophisticated structures, the heterogeneous self-assembly of a single type of nanoparticle in one step remains challenging. Here, facilitated by spatial confinement induced by a skin layer in a drying droplet, we achieve the heterogeneous self-assembly of a single type of nanoparticle by quickly evaporating a colloid-poly (ethylene glycol) (PEG) droplet. During the drying process, a skin layer forms at the droplet surface. The resultant spatial confinement assembles nanoparticles into face-centered-cubic (FCC) lattices with (111) and (100) plane orientations, generating binary bandgaps and two structural colors. The self-assembly of nanoparticles can be regulated by varying the PEG concentration so that FCC lattices with homo- or heterogeneous orientation planes can be prepared on demand. Besides, the approach is applicable for diverse droplet shapes, various substrates, and different nanoparticles. The one-pot general strategy breaks the requirements for multiple types of building blocks and predesigned substrates, extending the fundamental understanding underlying colloidal self-assembly. © 2023 American Chemical Society.

AB - Self-assembly of colloidal nanoparticles has generated tremendous interest due to its widespread applications in structural colorations, sensors, and optoelectronics. Despite numerous strategies being developed to fabricate sophisticated structures, the heterogeneous self-assembly of a single type of nanoparticle in one step remains challenging. Here, facilitated by spatial confinement induced by a skin layer in a drying droplet, we achieve the heterogeneous self-assembly of a single type of nanoparticle by quickly evaporating a colloid-poly (ethylene glycol) (PEG) droplet. During the drying process, a skin layer forms at the droplet surface. The resultant spatial confinement assembles nanoparticles into face-centered-cubic (FCC) lattices with (111) and (100) plane orientations, generating binary bandgaps and two structural colors. The self-assembly of nanoparticles can be regulated by varying the PEG concentration so that FCC lattices with homo- or heterogeneous orientation planes can be prepared on demand. Besides, the approach is applicable for diverse droplet shapes, various substrates, and different nanoparticles. The one-pot general strategy breaks the requirements for multiple types of building blocks and predesigned substrates, extending the fundamental understanding underlying colloidal self-assembly. © 2023 American Chemical Society.

KW - droplet evaporation

KW - heterogeneous self-assembly

KW - Marangoni flow

KW - photonic crystal heterojunction

KW - skin formation

KW - structural colors

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Heterogeneous Self-Assembly of a Single Type of Nanoparticle Modulated by Skin Formation

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