Abstract
We synthesize and optically characterize pure PMMA and PMMA incorporated with metal oxides nanoparticles (MO NPs) such as ZnO, CuO, TiO2 and SiO2 NPs nanocomposite thin films with weight concentration of 10% using dip-coating technique. SEM images of MO NPs show that all NPs have nearly an average size of around 50 nm. The optical parameters such as, optical parameters (n and k), optoelectronics properties, dispersion, band-gap energy and band structure of as-prepared nanocomposite thin films were determined by analyzing the transmittance and reflectance spectra. Mainly, optical band-gap energy (Eg) and the thickness of thin films are evaluated to a high degree of accuracy by utilizing Q-functional derived using a mathematical model recently published. The Q(E) is a functional containing experimental transmission and reflection data and the incident photon energy. The Eg value of un-doped PMMA thin films is found to be 4.273 eV. This value decreases as pre-selected MO NPs are introduced into thin films. These values are in excellent agreement with those determined using Tauc method. The FTIR technique is employed to elucidate the vibrational bands of the nanocomposites and the intermolecular bonding between PMMA matrix and the MOs NPs. Thermal stability is investigated by employing thermogravimetric analysis (TGA) at temperatures up to 400 °C. The obtained TGA thermograms indicate that adding MOs NPs to PMMA yield thin films of better thermal stability. The obtained doped thin films show a great promise for fabricating high-efficient optoelectronic devices.
Highlights
Inorganic-organic nanocomposites have gained a technological robust in the field of linear optics, nonlinear optics and solar cells owing to their outstanding properties and novel applications [1, 2, 3, 4, 5, 6, 7]
We synthesize PMMA, and ZnO, CuO, SiO2 and TiO2 NPs nanocomposites incorporated with PMMA thin films with a weight concentration of 10%
The optical properties such as optical constants (n and k), optoelectronic, dispersion, bandgap energy, and the band structure properties of the prepared nanocomposite thin films were determined by analyzing the transmittance and reflectance spectra
Summary
Inorganic-organic nanocomposites have gained a technological robust in the field of linear optics, nonlinear optics and solar cells owing to their outstanding properties and novel applications [1, 2, 3, 4, 5, 6, 7]. Considerable interest has been devoted on designing novel nanocomposite thin films as they play major roles in fabricating micro-optical and optoelectronic components Owing to their various optical properties such as high/low refractive index, tailored absorption/emission properties and strong optical nonlinearities, they have been of great worldwide [33, 34, 35, 36]. Fabricating nanocomposite thin films with specific controlled optoelectronic properties via densifying integrated optimal MO NPs fillers with polymeric host material increases their index of refraction. They become of potential applications for devices using high optical transparencies [44, 45, 46]. The thermal stability of doped polymeric thin films was investigated using thermogravimetric analysis (TGA) technique
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