Investigation of the effects of acidic pH and annealing on the properties of nanostructured TiO2 thin films for waveguiding applications

Chibani, Ouissem; Touam, Tahar; Chelouche, A.; Ouarez, Lydia

doi:10.1016/j.jallcom.2018.07.338

Cited by 10 publications

(3 citation statements)

References 47 publications

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“…All the films show clear Raman peaks located at 144, 197, 399, 515 and 639 cm −1 corresponding to the anatase phase of TiO2 [44]. According to literature, the observed Raman modes are assigned as follows [45,46]: the Raman bands located at 144, 197 and 639 cm -1 are assigned to Eg LO-phonon modes of anatase structure whereas the 399 cm -1 band is attributed to B1g LO-phonon mode. The Raman band occurring at 515 cm −1 , at room temperature, is split into two peaks centered at around 519 cm −1 and 513 cm −1 at low temperature as shown in Fig.…”

Section: Experimental Preparation Conditionsmentioning

confidence: 75%

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Doghmane

Challali

Touam

et al. 2021

JNanoR

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Titanium dioxide thin films were deposited by radio frequency sputtering on glass substrates at different substrate temperatures. Hence, we first optimized the preparation conditions and parameters which offer better control and reproducibility of film fabrication. Then, we investigate the structural, morphological and optical properties of the prepared titanium dioxide thin films. To do so, we used several characterization techniques: X-ray diffraction, Raman spectroscopy, scanning electron microscopy, atomic force microscopy and ultraviolet-visible spectroscopy. Interesting results were obtained, e.g. X-ray diffraction analysis shows that the films crystallize only in the anatase tetragonal structure with a preferential orientation along the (101) plane. The intensity of the (101) diffraction peak and the crystallite size are found to increase with increasing substrate temperature, indicating a crystallinity improvement of the films. Raman peaks observed around 144, 197, 399, 515 and 639 cm−1 conﬁrm that all samples possess anatase phase and the crystallinity is enhanced with increasing substrate temperatures. The analysis of scanning electron microscopy and atomic force microscopy images demonstrates that increasing the substrate temperature significantly affects the morphology, grain size and surface roughness of TiO2 films. The ultraviolet-visible spectroscopy analysis put into evidence that the ﬁlm deposited at RT is highly transparent in the visible region with average transmittance greater than 84%. Higher substrate temperatures result in a slight decrease of transmittance. Moreover, the direct optical band gap decreases while the refractive index increases with increasing the substrate temperature. Thus, the obtained results reveal that ultraviolet-visible can be considered as a potential material for optical and photovoltaic applications.

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Section: Experimental Preparation Conditionsmentioning

confidence: 75%

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Doghmane

Challali

Touam

et al. 2021

JNanoR

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“…This can be explained on the basis of the hydrolysiscondensation reactions. Indeed, in highly acidic media, the low-hydrolyzed species will exhibit a high condensation reaction, leading to the formation of bigger crystallites [20]. However, higher alkalinity favors nucleation, leading to the formation of colloidal solutions and, hence, a smaller crystallite.…”

Section: Structural Analysismentioning

confidence: 99%

“…Among these methods, the sol-gel route presents several advantages, including ease of use, low cost, and chemical composition control. The quality of the thin film in the sol-gel process depends on several parameters, such as the sol concentration [17], drying and annealing temperatures [18], and the pH of the sol [19,20]. Particularly, the pH of the solution impacts significantly the formation of the crystalline phase, crystallite size, morphology, and optical properties of TiO2 nanostructures.…”

Section: Introductionmentioning

confidence: 99%

TiO 2 sol-gel thin films: role of acidic and basic pH on physical characteristics

Khima,

Chelouche,

Challali

et al. 2024

Preprint

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In this work, we discuss the effects of acidic and basic pH on the structural, morphological, and optical properties of TiO2 sol-gel thin films deposited on glass substrates by the dip coating method. X-ray diffraction (XRD) and Raman spectroscopy (RS) show that all the samples are polycrystalline and possess anatase structure with preference orientation along the (101) direction. It is found that crystallite size decreases with the increasing pH of the sol for both acidic and basic pH. Atomic force microscopy (AFM) demonstrated a homogenous grain distribution and smooth surface of all films. The surface roughness is influenced by the pH of the sol. UV-visible spectroscopy revealed a higher level of transparency for all films. The deposition medium's pH significantly influences the thin films' optical properties, particularly the direct and indirect band gaps, and refractive index. Photoluminescence measurements revealed a strong violet-blue emission band whose intensity depends strongly on the pH of the sol. Particularly, the emission intensity from the film deposited at a pH value of 10 is significantly lower and exhibited a distinct spectral signature compared to the other samples.

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Preparation of nanostructured TiO2 films with high catalytic activity and their 3D spatial distribution of anatase and rutile phases

Colomer

Campo

2019

J Mater Sci

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Investigation of the effects of acidic pH and annealing on the properties of nanostructured TiO2 thin films for waveguiding applications

Cited by 10 publications

References 47 publications

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

Radio Frequency Magnetron Sputtering Growth of Titanium Dioxide Thin Films: Effects of Substrate Temperature on Microstructural and Optical Properties

TiO 2 sol-gel thin films: role of acidic and basic pH on physical characteristics

Preparation of nanostructured TiO2 films with high catalytic activity and their 3D spatial distribution of anatase and rutile phases

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