Abstract
This article reports about nanocomposites, which refractive index is tuned by adding TiO2 nanoparticles. We compare in situ/ex situ preparation of nanocomposites. Preparation procedure is described, properties of nanocomposites are compared, and especially we examine the applicability of two-photon polymerization (2PP) of synthesized nanocomposites. All prepared samples exhibit suitable optical transparency at specific laser wavelengths. Three-dimensional structures were generated by means of two-photon polymerization effect induced by a femtosecond laser.
Highlights
The need for optical materials with high refractive index in the fields of ophthalmic lenses, filters, optical adhesives, highly reflective and antireflection coatings, as well as advanced optoelectricPolymers 2014, 6 fabrications, are increasing [1,2,3,4,5,6,7,8]
At room temperature X-ray diffraction (XRD) curves exhibit that TiO2 nanoparticles have amorphous structure [15]
In order to obtain the TiO2 crystals, we investigated the nanoparticles at different temperature
Summary
The need for optical materials with high refractive index in the fields of ophthalmic lenses, filters, optical adhesives, highly reflective and antireflection coatings, as well as advanced optoelectric. High refractive index nanoparticles can be embedded into polymer matrix to tune the refractive index of nanocomposites. The generated structures with high refractive index can be used, e.g., in optical tweezers, as the acting forces depend on the refractive index of materials [17,18,19]. Structures by means of 2PP was demonstrated in polymers with TiO2 nanoparticles. Sakallari fabricated 2PP structures with refractive index 1.54 [16]. We compare two different strategies of generation of 2PP structures in high refractive index nanocomposites: This article reports in situ and ex situ preparation of high refractive index polymer/TiO2 nanocomposites and analysis of structurability by 2PP when increasing the TiO2 nanoparticles concentration. We show that the refractive index of the synthesized nanocomposites increases with the TiO2 nanoparticle concentration dispersed in the polymer.
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