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.

Liu et al. Nanoscale Research Letters 2012 7:457   doi:10.1186/1556-276X-7-457

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