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Structurally Colored Polymer Films with Narrow Stop Band, High Angle-Dependence and Good Mechanical Robustness for Trademark Anti-counterfeiting

Abstract

The photonic stop bands of colloidal crystals appear as structural colors, which are potentially useful for display devices, colorimetric sensors, optical filters, paints, and photonic papers. But low durability and pale colors caused by undesired scattering of light seriously limit their practical applications. In this article, a polydimethylsiloxane (PDMS)/photonic crystal (PC)/PDMS sandwich structure was designed as a free standing structural colored film with good durability and brilliant color. The monodisperse polystyrene (PS) spheres were self-assembled on the hydrophobic surface of the PDMS to facilitate the integrity of the assembly structure, then PDMS with refractive index 1.41 was filled in the gap between PS spheres (nPS=1.59) to replace the air (nair=1) and covered a thin layer on surface of PS PC, forming a continuous and free standing PC film. The continuous feature of the composite PC can greatly improve its mechanical properties. At the same time, the lower index contrast results in narrow reflection peaks of the composite films, which means higher color purity and brightness were achieved. The clearly distinguished vivid structural colors can be observed from red to green or green to blue by tuning the viewing angle from 5o to 50o for the composite films with PS spheres of 247 nm or 209 nm, respectively. Which can also be easily patterned by spraying method and made into a trademark on the clothes. Clearly patterns with different structural colors at different angle can be observed under the sunlight, which are potentially useful for security materials

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Publication details

The article was received on 19 May 2018, accepted on 11 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR04058C
Citation: Nanoscale, 2018, Accepted Manuscript
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    Structurally Colored Polymer Films with Narrow Stop Band, High Angle-Dependence and Good Mechanical Robustness for Trademark Anti-counterfeiting

    Z. Meng, S. Wu, B. Tang, W. Ma and S. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04058C

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