Polystyrene (PS) colloidal photonic crystals (CPhCs) containing silver<br />nanoparticles (AgNPs) present tunable structural colors. PS CPhC color<br />films containing a high concentration of AgNPs were prepared using<br />self-assembly process through gravitational sedimentation method.<br />High-concentration AgNPs were deposited on the bottom of the substrate<br />and acted as black materials to absorb background and scattering light.<br />Brilliant structural colors were enhanced because of the absorption of<br />incoherent scattering light, and color saturation was increased by the<br />distribution AgNPs on the PS CPhC surfaces. The vivid iridescent<br />structural colors of AgNPs/PS hybrid CPhC films were based on Bragg<br />diffraction and backward scattering absorption using AgNPs. The photonic<br />stop band of PS CPhCs and AgNPs/PS hybrid CPhCs were measured by<br />UV-visible reflection spectrometry and calculated based on the<br />Bragg-Snell law. In addition, the tunable structural colors of AgNPs/PS<br />hybrid CPhC films were evaluated using color measurements according to<br />the Commission International d'Eclairage standard colorimetric system.<br />This paper presents a simple and inexpensive method to produce tunable<br />structural colors for numerous applications, such as textile fabrics,<br />bionic colors, catalysis, and paints.
Lai, C.-F., & Wang, Y.-C. (2016). Colloidal Photonic Crystals Containing Silver Nanoparticles with Tunable Structural Colors. Crystals, 6(5), 61. https://doi.org/10.3390/cryst6050061