Bio-inspired dual-responsive photonic crystal with smart responsive hydrogel for pH and temperature detection

Bioderived Composite Hydrogel Sensor: Combining Superstretchability, Moisture Retention, and Temperature Resistance for Strain and Temperature Visualization

“…The nonlinear relationship between reflection peaks and tensile strains was maintained with R 2 = 0.99911 (Figure 7d and Figure 5i). Figure 7e,f shows the reflectance spectra and the nonlinear relationship between reflection peaks and temperatures, where the reflection peaks at 25,27,29,30,31,32,33,35, and 37 °C were 628, 626, 626, 615, 601, 594, 590, 586, and 586 nm, respectively. The reflection peaks of the hydrogel were at 629 nm at 25 °C and 585 nm at 37 °C after 2 months, which remained stable in 50 cycles (Figure S6).…”

“…Based on their unique optical properties and stimulus responsiveness, − the photonic crystals are combined with hydrogels or elastomers for the visualization of physical, − chemical, − and biological stimuli. − Park and Chang designed an all-solid-state electrically tuned photonic crystal sensor with flexibility, and the lattice distance decreased with the increase in voltage and resulted in the blue shift of the structural color, which was attached to the 3D structure for verifying its flexible electrochromic performance. Pan et al prepared a biomimetic Janus structured color film with stable electrical sensing and visual optical sensing performance, which met the needs of flexible stretchable electronic products.…”