The Sensitization of TiO2 Thin Film by Ag Nanoparticles for the Improvement of Photocatalytic Efficiency

Kavaliūnas, Vytautas; Čeplikas, Paulius; Sriubas, Mantas; Laukaitis, Giedrius

doi:10.3390/app12115725

Cited by 7 publications

(5 citation statements)

References 50 publications

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“…TiO 2 is considered an ideal semiconductor photocatalyst material due to its high catalytic activity, non-toxicity to the human body, and strong oxidizing and reducing properties [4]. At present, metal doping [5,6] has been discovered to adjust the energy band gap of TiO 2 to different degrees, non-metal doping [7], metal deposition [8], and other methods to broaden the light response range of TiO 2 film. When a certain number of metal ions are doped into TiO 2 , electron trapping centers are formed, which promote the migration of electrons.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of Ag/TiO2 via the DC Magnetron Sputtering Method and Its Application in the Photocatalytic Degradation of Methyl Orange in Na2SO4 Solution

Sun,

Que,

Ruan

et al. 2024

Applied Sciences

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TiO2 and TiO2 films modified with Ag (Ag/TiO2) were prepared via the DC magnetron sputtering method and the degree of modification was controlled via the sputtering power and time of Ag. The microstructures and properties of these films were characterized using field emission scanning electron microscopy, X-ray diffractometry, ultraviolet–visible diffuse reflectance spectrometry, atomic force microscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the prepared films have an anatase structure. Compared with pure TiO2, Ag deposition can improve the utilization of light. The three-dimensional images of Ag/TiO2 clearly show that with the increase in Ag sputtering power and sputtering time, Ag particles on the surface of the film gradually increase, and the structure of the film is relatively dense. The photocatalytic effect of Ag/TiO2 films is the best when the Ag sputtering power is 5 W and the sputtering time is 50 s. Under high-pressure mercury lamp irradiation, the photocatalytic degradation rate of methyl orange (MO) in pure MO solution with Ag/TiO2-5 W-50 s can reach 100% within 55 min, whereas that in MO-Na2SO4 mixed solution can reach 99.55% within 65 min. The results suggest that the presence of Na2SO4 in MO solution can inhibit the degradation of MO using Ag/TiO2, the result of XPS suggests that Na2SO4 accelerates the oxidation of Ag, which may lead to an increase in the recombination rate of photogenerated electron–hole pairs and a decrease in the degradation rate. During the process of recycling photocatalysts, the degradation rate of MO was apparently reduced. A possible reason is that the Ag particles have been oxidized and products of photocatalytic degradation are on the surface of the photocatalyst. The photocatalytic degradation mechanism was studied.

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Section: Introductionmentioning

confidence: 99%

The Synthesis of Ag/TiO2 via the DC Magnetron Sputtering Method and Its Application in the Photocatalytic Degradation of Methyl Orange in Na2SO4 Solution

Sun,

Que,

Ruan

et al. 2024

Applied Sciences

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“…The following materials were considered for plasmonic nanoparticles: Au [16,17]; Ag [18]; Pt [19], Al [20], TiN [21]. Varying the material of plasmonic particles, their size and shape, is a key tool for tuning the spectral properties of a photoelectrode [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Morphology of TiO2/ Au NP Nanocomposite on ITO/Glass Substrate on Their Photoelectrochemical Properties

Voronin,

Nemtsev,

Shabanova

et al. 2023

Preprint

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In this work, nanocomposite photoelectrodes of the TiO2/ Au composition were manufactured, in which the size of plasmonic Au nanoparticles was varied, and the morphology of the TiO2 layer, depending on the thickness, changed from an island to a continuous layer. The influence of the morphology of plasmonic Au nanoparticles and the TiO2 layer on the optical and photoelectrochemical characteristics of hybrid photoelectrodes was studied. It has been shown that continuous coating of Au nanoparticles with a TiO2 layer (layer thickness 10 and 15 nm) leads to a decrease in the photoelectric response, and the decrease in photocurrent density and photoconversion efficiency decreases in proportion to the thickness of the TiO2 layer. The indicated drop in characteristics when plasmonic particles are located under the TiO2 layer is presumably associated with the scattering and recombination of charge carriers in the semiconductor layer. The best performance was shown by a system in which large Au nanoparticles (10 nm) are coated with a 5 nm thick layer of titanium dioxide; in this geometry, Au nanoparticles are decorated with TiO2 nanoparticles, as a result of which the photoelectrode-electrolyte interface has a more complex structure.

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“…TiO 2 rutile phase has a tetragonal structure with six atoms per unit cell. TiO 2 anatase phase has a tetragonal structure the same as rutile; however, in anatase, the distortion of TiO 6 octahedron is slightly larger [12,13]. In a rutile structure, each octahedron is coordinated with ten neighbors, while in anatase, it is in contact with eight.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of titanium dioxide using PLD at various energy of pulsed laser

Mohammed¹,

Fakhri²

2022

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Because of its distinctive optical and electrical characteristics, titanium dioxide (TiO2) thin films are one of the significant and promising semiconductor materials for environmental and energy applications. The effect of the laser pulse energy of Nd:YAG on the properties of TiO2 thin film grown on silicon and quartz substrates using the laser pulse deposition technique by the crystal structure, surface area, crystalline structure, average particle size, and porosity were summarised. The nano-thin film with the optimum condition has been prepared with a pulse laser energy of 900 mJ. The optical properties have been investigated using UV–vis spectrophotometer, morphological properties have been studied using atomic force microscopy and field emission scanning electron microscopy, and structural properties have been examined using x-ray diffractometer and Raman spectrometer. The tests and measurements have shown a crystalline structure, and the distribution of the grains was regular in the film. Raman spectroscopy showed two diffraction peaks corresponding to anatase Eg and rutile Eg. This observation is typically used in dye-sensitised solar cells, separation sensor devices, and more.

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The Sensitization of TiO2 Thin Film by Ag Nanoparticles for the Improvement of Photocatalytic Efficiency

Cited by 7 publications

References 50 publications

The Synthesis of Ag/TiO2 via the DC Magnetron Sputtering Method and Its Application in the Photocatalytic Degradation of Methyl Orange in Na2SO4 Solution

The Synthesis of Ag/TiO2 via the DC Magnetron Sputtering Method and Its Application in the Photocatalytic Degradation of Methyl Orange in Na2SO4 Solution

Influence of the Morphology of TiO2/ Au NP Nanocomposite on ITO/Glass Substrate on Their Photoelectrochemical Properties

Preparation and characterization of titanium dioxide using PLD at various energy of pulsed laser

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