Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 25, Pages 16289-16295Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03739
Keywords
nanoparticles; polypyrrole black; wide viewing angle; high color contrast; structural color
Funding
- Jiangsu Overseas Research and Training Program for University Prominent Young and Midaged Teachers and Presidents
- China Postdoctoral Science Foundation [2013M541715, 2014T70541]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- University Research Foundation grant at Penn
- Fundamental Research Funds for the Central Universities, Shanghai Pujiang Program [16PJ1400100]
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Structural color with wide viewing angles has enormous potential applications in pigment, ink formulation, displays, and sensors. However, colors obtained from colloidal assemblies with low refractive index contrast or without black additives typically appear pale. Here, we prepare polypyrrole (PPy) black coated polystyrene (PS) nanoparticles and demonstrate well-defined colors with high color contrast and wide viewing angles under ambient light. Depending on the loading of pyrrole during polymerization, PPy nanogranules of different sizes and coverages are grafted to the surface of PS nanoparticles. The bumpy particles can self assemble into quasi-amorphous arrays, resulting in low angle dependent structure colors under ambient light. The color can be tuned by the size of the PS nanoparticles, and the presence of the PPy black on PS nanoparticles enhances the color contrast by suppressing incoherent and multiple scattering.
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