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Rapid fabrication of tunable structural color patterns by spray-coating
Jingran Huang1, Guiwu Liu1, Ting Lü2
1School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China. 1000005161@ujs.edu.cn.
Nanoscale
|October 29, 2024
Summary
This study introduces a simple spray-coating method for creating structural colors using colloidal self-assembly. The technique allows precise control over particle arrangement, enabling tunable iridescent colors for applications like anti-counterfeiting.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Structural color, derived from physical principles, is crucial for displays, sensors, and anti-counterfeiting.
- Conventional methods for structural color fabrication are complex and slow.
- Spray-coating offers a simpler route, but high-pressure atomization often yields amorphous photonic structures (APSs), hindering ordered particle assembly.
Purpose of the Study:
- To develop a controllable spray-coating method for fabricating ordered photonic structures.
- To achieve tunable optical properties and angle-dependent iridescent colors.
- To simplify the production of photonic crystals (PCs) and patterned structures.
Main Methods:
- Rational design of colloidal mixed solution composition.
- Control of particle concentration during spray-coating.
- Adjustment of evaporation temperatures to regulate particle assembly.
- Utilizing a simple spray-coating process for colloidal patterning on diverse substrates.
Main Results:
- Achieved effective regulation of colloidal particle assembly, yielding ordered and disordered structures.
- Demonstrated tunable optical properties and angle-dependent iridescent colors.
- Successfully patterned colloidal structures on various substrates using the proposed method.
Conclusions:
- The developed spray-coating technique simplifies photonic crystal fabrication.
- This method offers precise control over structural color generation.
- It presents significant potential for anti-counterfeiting applications through hard-to-replicate structured patterns.
