Table 1 |
|||||||
| Compositions of PS-silica core-shell spheres and properties of the corresponding photonic crystals | |||||||
| Code | TEOS (M) | Opal | Inverse opal | ||||
| λma (nm) | dmb (shell thickness) (nm) | dsc (shell thickness) (nm) | λmd (nm) | dae (nm) | Shrinkage ratiof (%) | ||
| PC0 | 0 | 530 | 224 ± 2.9 (0) | 223.4 (0) | 348 | 190.5 | 14.7 |
| PC3 | 0.03 | 564 | 242 ± 2.6 (20) | 241.2 (17.8) | 428 | 200.6 | 10.2 |
| PC6 | 0.06 | 586 | 250 ± 4.2 (26) | 252.4 (29.0) | 501 | 220.6 | 1.3 |
| PC9 | 0.09 | 606 | 262 ± 3.2 (38) | 262.5 (39.1) | 528 | 218.3 | 2.3 |
aWavelength of stop band maximum for the opal structure, observed from Figure 3; bdiameter of core-shell spheres, measured from SEM images; cdiameter of core-shell spheres, calculated from Equation 1; dwavelength of stop band maximum for the inverse opals, measured from the UV–vis spectra; ediameter of air spheres, calculated from Equation 1, assuming that the thickness of the shell was fixed; festimated from the ratio of da to the pristine diameter of the PS spheres.
Liu et al. Nanoscale Research Letters 2012 7:457 doi:10.1186/1556-276X-7-457
