cm9b02961_si_002.mov (9.37 MB)
Highly Stretchable Photonic Crystal Hydrogels for a Sensitive Mechanochromic Sensor and Direct Ink Writing
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posted on 2019-10-17, 15:34 authored by Jiayao Chen, Lirong Xu, Meijia Yang, Xiaochuan Chen, Xudong Chen, Wei HongPhotonic
crystals, which are materials with periodic dielectric
constants on the submicroscale, have been the focus of research for
an extended period. Photonic soft materials have been extensively
developed for use as colorimetric indicators and mechanochromic sensors,
but their limited mechanical properties and molding characteristics
only suitable for films restrict their practical implementation. Herein
we report an approach to synthesize highly stretchable photonic soft
materials based on a hydrogel system that is cross-linked by a crystalline
colloidal array. The intrinsic inhomogeneous submicroscale structure
is exploited for effective reinforcement in the multiphase system
of the photonic crystals. The photonic hydrogels exhibit a high deformation
capacity, with a stretching deformation above 2800% and compression
above 98%. The gel has a full-color tunable range and shows 460 nm
photonic shifts that can be reversibly actuated by a small compressive
stress (kPa level) and can be ink-written to form patterns and freestanding
structures. Mechanochromic sensors are constructed based on the three-dimensional
and two-dimensional Bragg diffraction of the gel. Owing to its mechanical
strength, formability, and tunable colors, the gel can be used in
wearable optical devices, colorimetric tactile sensors, and full-color
displays.
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full-color tunable rangedielectric constantstunable colorsfreestanding structuresdeformation capacitymaterialmolding characteristicshydrogel systemMechanochromic sensors460 nm photonic shiftsmechanochromic sensorsmultiphase systemfull-color displaysBragg diffractionkPa levelphotonic crystalscolorimetric indicatorssubmicroscale structureform patternsstretchable photonicphotonic hydrogels exhibitDirect InkPhotonic crystalsStretchable Photonic Crystal HydrogelsSensitive Mechanochromic Sensor
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