Fabrication and optical study of dye doped TiO2–SiO2 multilayer colloidal structures

Multilayer colloidal structures of TiO2 coated silica microspheres have been synthesized by using self-assembly vertical deposition technique and optical properties of these structures were also investigated using UV–visible spectroscopy. Morphology, elemental distribution and chemical bonding information is analysed using scanning electron microscopy (SEM), Energy dispersive X-ray Spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR) respectively. It is noticed that position of transmission dip is dependent upon the annealing temperature of the samples. The experimental measured normalized stop band width results are in good agreement with theoretical results at packing fraction value of 0.74.

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► TiO2 coated silica microspheres were prepared using Rhodamine B dye.
► Self-assembly method is used to develop multilayer colloidal structures.
► Scanning electron microscopy is used to see the surface morphology of samples.
► Energy dispersive X-ray spectroscopy is used to measure the elemental contents.
► Annealing temperatures effect on photonic band gap of colloidal structure was studied.