Construction of photonic crystals with thermally adjustable pseudo-gaps

Abstract

Photonic crystals prepared by perfusing PNIPAM hydrogel into silica photonic crystals exhibit thermo-responsive pseudo-gaps between 24 °C and 34 °C.

Photoresponsive photonic crystals constructed from azobenzene-grafted silica microspheres

“…First, nano-silica microspheres were prepared according to our previous work (C. Li et al, 2020). Into a ask, 15 mL ethanol, 5 mL water and 2 mL ammonium hydroxide were added, then mixture of 15 mL ethanol and 3 mL TEOS was added in 1100 rpm stirring state.…”

Multi-stimuli responsive photonic hydrogel based on a novel photonic crystal template containing gold nanorods

“…[1][2][3] Therefore, a series of PC materials with vivid structural colors have been fabricated, which have significant application value in sensors, [4][5][6] drug delivery, [7][8][9] actuators, [10][11][12] printing [13][14][15] and other fields. [16][17][18] A hydrogel is a stimulus-responsive material due to its elastic network that can shrink and swell, so it is usually combined with PC to fabricate stimulus-responsive photonic hydrogels, which realize a visual conversion to optical signals by changing structural colors in response to external stimuli, such as light, 19,20 organic compounds and solvents, [21][22][23][24] metal ions, 25,26 temperature, [27][28][29] and pH. [30][31][32] For example, Zhao et al 33 combined a polymeric hydrogel with an SiO 2 inverse opal structure to prepare an inverse opal hydrogel (IOH) sensor which can respond to pH, temperature and ultraviolet light.…”

Naked-Eye Visual Thermometer Based on Glycerol─Nonclose-Packed Photonic Crystals for Real-Time Temperature Sensing and Monitoring

“…Thermochromic hydrogels based on the PCs can sense temperature changes through their structural colors, which was the result of lattice distance tuning with temperature, and the tuning ranges of reflection peak was mostly within 100 nm (Table S1). − To enhance the effect of visualization, thermochromic hydrogels based on inverse opal PCs were proposed. The decrease of lattice distance and the effective refractive index were combined to get a greater blueshift of the PBG (Table S2), − which achieved temperature visual sensing in all the wavelength range.…”