AI Article Synopsis
- The study focuses on the behavior of magnetically responsive photonic crystals made from graphene oxide (GO) nanosheets suspended in water.
- When a strong magnetic field is applied, the crystals display different structural colors depending on the field's orientation—showing vibrant colors perpendicular to the field and losing color when applied parallel.
- By adjusting the concentration of GO and the duration/strength of the magnetic field application, researchers enhanced color quality and developed a method for color switching by alternating the magnetic direction.
Article Abstract
Magnetically responsive photonic crystals of colloidal nanosheets hold great promise for various applications. Here, we systematically investigated the magnetically responsive behavior of a photonic crystal consisting of graphene oxide (GO) nanosheets and water. After applying a 12 T magnetic field perpendicular and parallel to the observation direction, the photonic crystal exhibited a more vivid structural color and no structural color, respectively, based on the magnetic orientation of GO nanosheets. The reflection wavelength can be modulated by varying the GO concentration, and the peak intensity can be basically enhanced by increasing both the time and strength of the magnetic application. To improve color quality, we developed a novel approach of alternately applying a magnetic field to two orthogonal directions, instead of using a rotating magnetic field. Finally, we achieved color switching by changing the direction of applied magnetic fields.
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| http://dx.doi.org/10.1039/d3nr06114k | DOI Listing |
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