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Dip-coating sol–gel preparation and characterization of Rhodamine 6G-doped nanostructured TiO2 thin films on structural and spectroscopic properties

  • Original Paper: Sol–gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

Structural and spectroscopic properties of nanostructured titanium dioxide (TiO2) thin films prepared by the dip-coating sol–gel process and doped with rhodamine 6G (R6G) were studied. R6G doping was achieved by adding different concentrations of 1 × 10−2, 1 × 10−3, 1 × 10−4, and 1 × 10−5 M rhodamine to a solution that contained titanium isopropoxide as a precursor. The best molar ratio (1: 1: 10: 0.1) of initial raw materials (TTIP: H2O: EtOH: HCl) was chosen to prepare the TiO2 host. TiO2 thin films were deposited on a silicon substrate. X-ray diffraction (XRD) results indicated that the prepared films are amorphous. Atomic force microscopy (AFM) images demonstrate that the surface topography of the films has a homogeneous granular feature. Fourier transform infrared (FTIR) results revealed that the original structural group of R6G molecules is incorporated in the matrix of the TiO2 films. The short-range order of brookite TiO2 phase in the range of (100–700 cm−1) was depicted by Raman spectra. The glass slide was chosen as a substrate to measure the absorbance spectrum of the thin films. Various fluorescence peaks of R6G-doped TiO2 thin films were depicted in the ultraviolet–visible (UV–vis) region under 300 nm pumping wavelength. The fluorescence spectrum suggests that the hybrid solid-state UV and visible laser and optoelectronic device design can be manufactured.

Hybrid R6G-TiO2 nanostructured thin films with different concentrations of R6G were prepared successfully by dip-coating sol–gel technique. The prepared pure and doped films were analyzed by XRD, AFM, FTIR, and Raman techniques. Different fluorescence emission peaks have been obtained in UV–Vis regions. The fluorescence spectrum suggests manufacturing the hybrid solid-state UV and visible laser and optoelectronic device design.

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  1. Department of Physics, College of Education, University of Sulaimani, Sulaymaniyah, Kurdistan Region, Iraq

    Majida A. Ameen, Muhammad A. Saeed & Aras S. Mahmood

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Ameen, M.A., Saeed, M.A. & Mahmood, A.S. Dip-coating sol–gel preparation and characterization of Rhodamine 6G-doped nanostructured TiO2 thin films on structural and spectroscopic properties. J Sol-Gel Sci Technol 101, 655–671 (2022). https://doi.org/10.1007/s10971-022-05738-8

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