Biotemplated Morpho Butterfly Wings for Tunable Structurally Colored
Photocatalysts
Posted on 2018-01-16 - 19:53
Morpho sulkowskyi butterfly wings contain naturally occurring
hierarchical nanostructures that produce structural coloration. The
high aspect ratio and surface area of these wings make them attractive
nanostructured templates for applications in solar energy and photocatalysis.
However, biomimetic approaches to replicate their complex structural
features and integrate functional materials into their three-dimensional
framework are highly limited in precision and scalability. Herein,
a biotemplating approach is presented that precisely replicates Morpho nanostructures by depositing nanocrystalline ZnO
coatings onto wings via low-temperature atomic layer deposition (ALD).
This study demonstrates the ability to precisely tune the natural
structural coloration while also integrating multifunctionality by
imparting photocatalytic activity onto fully intact Morpho wings. Optical spectroscopy and finite-difference time-domain numerical
modeling demonstrate that ALD ZnO coatings can rationally tune the
structural coloration across the visible spectrum. These structurally
colored photocatalysts exhibit an optimal coating thickness to maximize
photocatalytic activity, which is attributed to trade-offs between
light absorption and catalytic quantum yield with increasing coating
thickness. These multifunctional photocatalysts present a new approach
to integrating solar energy harvesting into visually attractive surfaces
that can be integrated into building facades or other macroscopic
structures to impart aesthetic appeal.
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Rodríguez, Robin E.; Agarwal, Sneha P.; An, Shun; Kazyak, Eric; Das, Debashree; Shang, Wen; et al. (2018). Biotemplated Morpho Butterfly Wings for Tunable Structurally Colored
Photocatalysts. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b14383
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AUTHORS (9)
RR
Robin E. Rodríguez
SA
Sneha P. Agarwal
SA
Shun An
EK
Eric Kazyak
DD
Debashree Das
WS
Wen Shang
RS
Rachael Skye
TD
Tao Deng
ND
Neil P. Dasgupta