TiO₂-nanoparticles enhances the structure and optical behaviors of PMMA/glass polymeric films: Kramers-Kroning analysis

Abstract

The proposed novel optical system of composites of polymethyl methacrylate (PMMA)/titanium oxide (TiO2) nanoparticles were planned to be used as polymeric materials according to their standing full applied optical applications. The spin coating method, an easy and cost-effective technique, was utilized to uniformly deposit and prepare these TiO2/PMMA thin films on glass substrates, wherein nature, the films’ uniformity, and structures’ crystallinity. The interactions between the TiO2 nanoparticle and PMMA as a matrix were confirmed through atomic force microscopy (AFM) and x-ray diffraction (XRD). The linear optical characterization of the obtained thin films was characterized using a spectrophotometer at a wavelength ranging from 200 nm to 1000 nm. Linear refractive index and absorption coefficient, direct and indirect optical bandgaps, and nonlinear optical parameters for the as-prepared samples were calculated using Kramers-Kroning analysis. Moreover, the optical limiting was studied using He-Ne laser 632.8 nm and green diode laser with 532 nm wavelength. This TiO2/PMMA, as a novel optical system, is a good optical system to be used for capable various future technical applications, such as optical filter, solar cells, electronic apparatus, and optoelectronics devices.

PMMA@TiO2@SiO2 Composite Microsphere with Sufficiently High Light Transmittance and Haze for Promising Application in Optical Diffusion Film

“…This finding could be reasonably explained by the fact that the refractive index of nanosilicon dioxide closely matches that of the substrate material, allowing it to create microstructures on the surface of the diffusion film, thereby reducing light reflection and refraction to improve the optical transparency . On the other hand, nanotitanium dioxide having a higher refractive index increased the surface roughness of the diffusion films, resulting in micro protrusions and indentations that enhanced light reflection and scattering on the film surface, and finally leading to an increased haze . By appropriately distributing nanosilicon dioxide and nanotitanium dioxide on the surface of PMMA microspheres at a predetermined concentration, adjustment of optical properties of the diffusion films can readily be achieved.…”

“…27 On the other hand, nanotitanium dioxide having a higher refractive index increased the surface roughness of the diffusion films, resulting in micro protrusions and indentations that enhanced light reflection and scattering on the film surface, and finally leading to an increased haze. 28 By appropriately distributing nanosilicon dioxide and nanotitanium dioxide on the surface of PMMA microspheres at a predetermined concentration, adjustment of optical properties of the diffusion films can readily be achieved. Figure 5b and c illustrate the average transmittance and haze of the diffusion films, demonstrating that the optimal overall optical performance of the P@T@S diffusion film could achieve a transmittance up to 90.5% and a haze of 88.3% (with detailed pictures of various diffusion films presented in Figure S4).…”

Facile way of preparing PMMA@TiO2@SiO2 (P@T@S) composite microspheres with high haze and light transmittance for diffusion film

“…This phenomenon could be theoretically explained as follows: the refractive index of nanosilicon dioxide was similar to that of the substrate material, which helped to reduce the light reflection and refraction to increase the optical transparency 27 . What's more, nanotitanium dioxide could increase the surface roughness of the diffusion films, which increased the light reflection and scattering on the surface of the films and led to an increased haze 28 . When nanosilicon dioxide and nanotitanium dioxide distributed on the surface of PMMA microspheres achieved a target content, the optical properties of the diffusion films were achieved as desired 29 …”

“…27 What's more, nanotitanium dioxide could increase the surface roughness of the diffusion films, which increased the light reflection and scattering on the surface of the films and led to an increased haze. 28 When nanosilicon dioxide and nanotitanium dioxide distributed on the surface of PMMA microspheres achieved a target content, the optical properties of the diffusion films were achieved as desired. 29 Figure 5a showed the average transmittance and haze of the diffusion films, and it could be observed that best overall optical performance of P@T@S diffusion film could be achieved.…”

An insight into the role of titanium oxide nanofiller on the structural, optical, electrical, and dielectric characteristics of PS/PVK composite

“…Metal-oxide NPs like titanium dioxide nanoparticles (TiO 2 NPs) are among the most used nanomaterials in industry. Their remarkable biocompatibility [7], optical properties [8], corrosion resistance [9], and exceptional electrical and catalytic properties [1,10] have garnered considerable interest [11].…”