Magnetically tunable photonic crystals based on anisotropic nanostructures
An anisotropic, photonic crystal technology, applied in the field of magnetically tunable photonic crystals, can solve the problems of limited efforts, unavailability of high-quality anisotropic building blocks, assembly and lack of effective mechanisms for tuning
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Embodiment 1
[0023] Synthesis of FeOOH nanorods:
[0024] According to an exemplary embodiment, the method begins with the synthesis of FeOOH nanorods. In a typical synthesis of 70 nm FeOOH nanorods, FeCl 3 ·6H 2 O was dissolved in 40 mL deionized water, and the Fe 3+ The concentration was adjusted to 0.02M. The undissolved pellet was discarded after centrifugation at 11000 rpm for 3 minutes. The supernatant was added to a three-necked flask and heated at 81 °C for 12 hours with magnetic stirring. The particles were then separated by centrifugation, washed several times with water and dispersed in 7.2 mL of water.
[0025] Surface modification of FeOOH nanorods:
[0026] The surface of the as-synthesized FeOOH nanorods was first functionalized with polyacrylic acid (PAA). Typically 3 mL of the above FeOOH dispersion and 1 mL of PAA solution (7.2 mg / mL) were added to 16 mL of water under sonication. The mixture was then stirred for 12 hours to allow PAA functionalization of the nano...
Embodiment 2
[0034] Nano-ellipsoids with higher aspect ratios can also be synthesized. In a typical synthesis of 110 nm FeOOH nanorods, FeCl 3 ·6H 2 O was dissolved in 40 mL deionized water, and the Fe 3+ The concentration was adjusted to 0.1M. 1 g of CTAB was added to the solution. The undissolved pellet was discarded after centrifugation at 11000 rpm for 3 minutes. The supernatant was added to a three-necked flask and heated at 90 °C for 18 hours with magnetic stirring. The particles were then separated by centrifugation, washed several times with water and dispersed in 36 mL of water.
[0035] The FeOOH nanorods thus synthesized were modified with PAA by a similar procedure. For silica coating, add 200 µL of TEOS to the above mixture every 30 min until the total amount of TEOS reaches 1.2 mL. After an additional 1 h reaction, the FeOOH@SiO 2 The nanospheroids were separated, washed several times with ethanol and water, and dispersed in ethanol. Then similar to the above process...
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