Spectral reflectance switching of colloidal photonic crystal structure composed of positively charged TiO2 nanoparticles

Abstract

Research on the effect of crystal structures on W-TiO2 nanotube array photoelectrodes by theoretical and experimental methods BiFeO 3 / TiO 2 core-shell structured nanocomposites as visible-active photocatalysts and their optical response mechanism

Monodentate N‐Ligand‐Directed Bifunctional Transition‐Metal Catalysis: Highly Enantioselective Friedel–Crafts Alkylation of Indoles with Nitroalkenes

“…The red, green, and blue colors resulting from stop‐band tuning are also exhibited in the figure. The decrease in reflectance and the relative peak area (Figure 4d) is probably due to partial disorder resulting from inhomogeneous spacing between the colloidal layers along the z ‐direction (normal to the electrode), as noted in a previous report 35. Detailed work on the colloidal modeling is underway to fully understand the mechanism of the tuning behavior.…”

“…Although the face centered cubic (fcc) structure of dielectric spheres in lower refractive index media only possess stopgaps, the local density of the states can still be significantly manipulated and the photonic stop‐band tuning can be realized even for quite modest index contrast. In our previous study,35 high refractive index TiO 2 nanoparticles only exhibited a short‐range interaction in ethylene glycol due to weak repulsive forces between particles. Hence, the manipulation of the stop‐band position with electrical potential was impossible, and only the blue structural color could be switched when the particle spacing was modulated with electrical potential.…”

Color brightness modulation of a responsive photonic liquid for multicolored electrochromic displays

“…The full width at half maximum (FWHM) seems to be shortened by B50%, confirming a higher ordered photonic structure. As discussed previously, [14][15][16][17][18][19][20] photonic liquids show characteristic angle-independent photonic color due to coherent scattering from their quasi-amorphous structure. Based on the test method illustrated in the inset in Fig.…”

“…Some charged nanoparticles (NPs) with a high refractive index, i.e. PS (polystyrene), 12 PMMA (polymethyl methacrylate)-PS, 13 ZnS@SiO 2 , 14 SiO 2 @TiO 2 , 15 and Fe 3 O 4 @SiO 2 , 16 TiO 2 , 17 have been developed. Upon applying a voltage, the electrophoretic movement of NPs is observed towards the opposite charged electrode, leading to a variation in colloidal lattice spacing, as a consequence of reflection wavelength.…”

Structural Color Manipulation Using Tunable Photonic Crystals with Enhanced Switching Reliability

“…The improved stability when the triangular waveform was applied may be due to shorter exposure to voltage above the minimum equilibrium potential required for hydrogen‐oxygen electrolysis (i.e., over‐potential ( E 0 ) = 1.23 V), a condition required for the production of ions. The stop‐band tuning is accompanied by current flow because the movement of the colloidal nanoparticles corresponds to the movement of mobile charge in the dispersion . Therefore, the change in the amount of current flow is closely related with the movement of the stop‐band position, as is shown in Figure (c).…”