Comparison on the TiO2 crystalline phases deposited via dip and spin coating using green sol–gel route

Johari, Nur Dalilah; Rosli, Zulkifli Mohd; Juoi, Jariah Mohamad; Yazid, Shuhadah A.

doi:10.1016/j.jmrt.2019.04.018

Cited by 54 publications

(34 citation statements)

References 46 publications

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“…Titania can be fabricated in the form of thin films, powders, or nanocrystals. Physical deposition techniques such as thermal evaporation, reactive sputtering and pulsed laser deposition, chemical gas-phase atomic layer deposition (ALD) process, and wet chemical deposition methods such as dip-coating, spin-coating, spray coating and sol-gel, have been employed by researchers to prepare TiO 2 thin films [184][185][186][187][188][189]. Those homogeneous films deposited by physical deposition techniques are beneficial for use in dye-sensitized solar cells, microelectomechanical systems and electroluminescent devices [185,189].…”

Section: Synthesis Of Titania Nanomaterialsmentioning

confidence: 99%

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

2020

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This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.

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Section: Synthesis Of Titania Nanomaterialsmentioning

confidence: 99%

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

2020

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“…Fischer et al, (2017) stated that the anatase phase of TiO2 would grow better at higher temperatures 28) . In addition, Johari et al, (2019) previous research also stated that for brookite formation a spin-coating deposition at low temperature is preferable 29) .…”

Section: Phase Analysismentioning

confidence: 99%

The Effect of GO/TiO_2 Thin Film During Photodegradation of Methylene Blue Dye

Azani¹,

Halin²,

Abdullah³

et al. 2021

Evergreen

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Titanium (IV) isopropoxide (TTIP) was used to synthesize GO/TiO2 thin films using a sol-gel spin-coating method onto a glass substrate, undergoing an heat tretment at 350 °C. Several amounts of graphene oxide (GO) (0-20mg) were weighed into a sol solution of TiO2 to produce GO/TiO2 thin films. The thin film samples were characterized by X-ray diffraction (XRD) to analyze the samples' phase and by scanning electron microscopy (SEM) to analyze the samples' microstructure. Physical testing such as water contact angle (WCA) was analyzed using an optical microscope with J-Image software. In contrast, the optical band gap and photodegradation of methylene blue under sunlight irradiation of the thin film was analyzed using UV-VIS spectrophotometry. GO5 thin film sample showed low-intensity anatase phase formation, where the microstructure revealed a larger surface area with the addition of GO. WCA reveals that GO/TiO2 thin film exhibits super hydrophilic properties where the angle decreases from 37.83° to 4.11°. The optical result shows that GO has improved the absorption edges by expanding into visible regions. Moreover, due to the existence of GO 3.30 eV band gap energy of TiO2 decreases from to 3.18 eV obtained by GO5. The improved adsorption edge allows Ti 3+ , O2 and interstitial states to be formed in low valence states with energy underneath than in the TiO2 band gap. Therefore, the photodegradation of methylene blue (MB) dye increases from 48 % to 59 % in the GO/TiO2 thin film.

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“…Some of the commonly used residuals that need to be minimized are: Rp (profile residual), Rwp (weighted profile residual) and χ2 (goodness of fit). As shown in Table 1, the refined structural parameters (lattice parameter, atomic position, occupancy rate and thermal The average crystallite size (D) for the composition x = 0.5 obtained at different temperatures was deduced from the profiles of the X-ray diffraction lines and calculated via Scherrer's formula [31]. As Table 3 shows, it is noteworthy that the crystallite size increases from 20 nm at 700°C to 26 nm at 1000°C; this means that the crystallinity increases with the annealing temperature.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0≤x≤1) nanopowders prepared by soft chemistry route

Jabbar

Lakhlifi

Ouatib

et al. 2021

Ceramics International

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Correlation between degree of crystallinity and bluing of Zn 1-x Co x Al 2 O 4 (0≤x≤1) nanopowders prepared by soft chemistry route, Ceramics International, https://doi.org/10.1016/ j.ceramint.2021.02.205. This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Comparison on the TiO2 crystalline phases deposited via dip and spin coating using green sol–gel route

Cited by 54 publications

References 46 publications

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

The Effect of GO/TiO_2 Thin Film During Photodegradation of Methylene Blue Dye

Correlation between degree of crystallinity and bluing of Zn1–Co Al2O4 (0≤x≤1) nanopowders prepared by soft chemistry route

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