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Successive Spin Coating Induces an Order-Disorder Transition in a Block Copolymer Micellar Nanoarray.

Yonggang Chen¹, Ruihao Xue¹, Ze Gong^1,2

¹CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China.

The Journal of Physical Chemistry Letters

|September 3, 2025

Summary

This summary is machine-generated.

Achieving tunable disorder in nanostructures is challenging. Successive spin coating dynamically controls nanodot density and disorder, offering a new method for surface pattern engineering without additives.

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Area of Science:

Materials Science
Nanotechnology
Surface Science

Background:

Controlling nanodot spatial arrangement is crucial for nanomaterials and biointerfaces.
Spontaneous self-assembly of block copolymer micelles is a common method for creating ordered nanostructures.
Achieving tunable disorder in these structures remains a significant challenge.

Purpose of the Study:

To demonstrate a novel method for dynamically modulating density and disorder in micellar arrays using successive spin coating.
To investigate the non-monotonic evolution of structural order with increasing coating cycles.
To offer a versatile strategy for engineering nanoscale surface patterns.

Main Methods:

Utilized successive spin coating to deposit block copolymer micelles.
Employed Voronoi tessellation and Alpha shapes filtering algorithms to analyze nanostructure order.
Quantified interparticle distances and disorder levels (σ_d/d̅) at different deposition stages.

Main Results:

Initial spin coating cycles resulted in hexagonal order (interparticle distance: 126 nm, σ_d/d̅ = 0.12).
Intermediate cycles led to maximal disorder (interparticle distance: 95 nm, σ_d/d̅ = 0.26).
Further deposition restored partial order due to steric hindrance (interparticle distance: 73 nm, σ_d/d̅ = 0.20).

Conclusions:

Successive spin coating provides dynamic control over nanodot density and disorder.
This method achieves tunable disorder comparable to polymer-blending techniques but without requiring additives.
The approach offers a versatile strategy for designing nanoscale surface patterns for biomaterials and optical devices.