Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 26, Pages 13585-13592Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp403129g
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Funding
- NSF through the MRSEC program
- NSF through the ERC program
- NSF through the MRI program
- NSF through the NNIN program
- NSF-REU/Lando program of the Department of Chemistry at the University of Minnesota
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Three-dimensionally ordered macroporous (3DOM) materials prepared by colloidal crystal templating are examples of photonic crystals that can exhibit structural color. The color intensity can vary widely, from a pale, nearly white opalescence to vivid, brilliantly metallic colors. Such variations are observed even for 3DOM materials of a single nominal composition that exhibit virtually identical structural order in scanning electron micrographs and are prepared from the same colloidal crystal templates. In this study we investigate the cause of the variations in color intensity for 3DOM ZrO2 systems, considering both the role of zirconia grains in the skeleton of the photonic crystal and the presence or absence of carbonaceous components in the material. Such components act as broad spectral light absorbers and are introduced either directly in the synthesis through the precursor and the polymeric template or by postsynthesis addition and carbonization of sucrose solutions. We conclude that grain-size effects do not play a significant role but that the carbon content in 3DOM ZrO2 provides direct control over the intensity of structural color in these photonic pigment materials.
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