Quantum dot-decorated semiconductor micro- and nanoparticles: A review of their synthesis, characterization and application in photocatalysis

Bajorowicz, Beata; Kobylański, Marek P.; Gołąbiewska, Anna; Nadolna, Joanna; Zaleska-Medynska, Adriana

doi:10.1016/j.cis.2018.02.003

Cited by 147 publications

(57 citation statements)

References 193 publications

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“…The electron from QDs can be inject into the CB of TiO2 NPs. The electron transfer from QDs to the TiO2 NPs is determined by the energy difference between the two CB positions energy levels, which acts as a driving force for interparticle electron transfer [25,68]. The highest difference between the CB positions energy levels were observed for TiO2 and SnS QDs, which means fastest electron transfer from QDs to TiO2 Photoexcited electrons are generated on the CB of QDs in upon the visible light absorption that leaves holes in the VB (Figure 9a).…”

Section: Photocatalytic Activity In the Gas Phasementioning

confidence: 99%

“…Recently, the literature data demonstrated that the decrease in particle size lowers the recombination of the electron-hole pair within the semiconductor particle. Quantum dots (QDs) with particles size in range from 2 to 20 nm exhibit distinctive properties owing to their high surface-to-volume ratio [25]. Band gap tailoring of QDs is contingent by controlling particle size.…”

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confidence: 99%

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The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

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The effect of type (AgInS 2 , SnS, CuS 2 , Bi 2 S 3 ) and amount (5, 10, 15 wt%) of quantum dots (QDs) on the surface properties and photocatalytic activity of QDs-sensitized TiO 2 composite, was investigated. AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were obtained by hot-injection, sonochemical, microwave, and hot-injection method, respectively. To characterize of as-prepared samples high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and photoluminescence (PL) emission spectroscopy were applied. The size of AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were 12; 2-6; 2-3, and 1-2 nm, respectively. The QDs and QDs-sensitized TiO 2 composites obtained have been tested in toluene degradation under LEDs light irradiation (λ max = 415 nm and λ max = 375 nm). For pristine QDs the efficiency of toluene degradation increased in the order of AgInS 2 < Bi 2 S 3 < CuS < SnS under 375 nm and AgInS 2 < CuS < Bi 2 S 3 < SnS under 415 nm. In the presence of TiO 2 /SnS QDs_15% composite, 91% of toluene was degraded after 1 h of irradiation, and this efficiency was about 12 higher than that for pristine QDs under 375 nm. Generally, building the TiO 2 /AgInS 2 and TiO 2 /SnS exhibited higher photoactivity under 375 nm than the pristine TiO 2 and QDs which suggests a synergistic effect between QDs and TiO 2 matrix. Catalysts 2020, 10, 403 2 of 18 application of metal sulfides (M x S y ) for wide band semiconductors modification, because of their high charge separation efficiency and narrow band gaps, which possibly enable light harvesting at longer wavelengths [9]. Liu et al. studied the efficiency of AgInS 2 /TiO 2 heterostructures in 1,2-dichlorobenzene (o-DCB) degradation under visible light [10]. They observed that AgInS 2 /TiO 2 composites could expand the visible-light response range and greatly decreased the recombination of photogenerated electron−hole pairs in the composites. The degradation of o-DCB for the most active sample reaches about 50% after 8h of irradiation. Jang et al. prepared Ag-SnS-TiO 2 nanocomposite for methylene blue and rhodamine B degradation under simulated sunlight [11].The photoactivity of the produced photocatalysts was about 2-3 times higher than that of P25. Compared with bare TiO 2 the CuS/TiO 2 [12], CdS/TiO 2 [13-15], SnS/TiO 2 [16], Ag 2 S/TiO 2 [17,18], CuInS 2 /TiO 2 [19-21], Bi 2 S 3 /TiO 2 [22][23][24] nanocomposites present a significant improvement on photocatalytic reactions due to the decreasing recombination of electron-hole pairs and the broadened light absorption spectra. However, the metal sulfides commonly employed for TiO 2 modification have been used in nanoparticle sizes and not in quantum dots sizes. Further, it has been shown that the size of metal sulfides (MS) particles can have an impact on its physicochemical and optical properties. Recently, the literature data demonstrated that the decrease in particle size lowers the recombination of the electron-hole pair within the semiconductor particle. Quantum...

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Section: Photocatalytic Activity In the Gas Phasementioning

confidence: 99%

mentioning

confidence: 99%

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

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“…This phenomenon happens due to the quantum confinement effect of different sizes of CQD or/and different states of emissive trap on the CQD surface [63]. This phenomenon facilitates the excitation of more charge carriers and improves the efficiency of the photocatalytic process [64,65]. 4.5.2.4.…”

Section: Spectral Convertermentioning

confidence: 99%

Photocatalytic degradation of biological recalcitrant pollutants: a green chemistry approach

2020

Biointerface Res Appl Chem

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Design and development of an environmentally friendly and non-toxic photocatalysts system for the complete mineralization of persistent organic pollutants is an emerging and hottest challenge throughout the globe. However, poor visible light harvesting capacity, faster rate of recombination of photogenerated electron and hole pairs, low charge transfer and agglomeration of photocatalysts in aqueous medium are some of the major bottleneck in this study area. This review paper presents the comprehensive details about the findings of the photocatalytic degradation of biological recalcitrant pollutants using non-metallic graphitic carbon nitride (g-C 3 N 4 ) and ZnO photocatalysts system. The basic mechanism of photocatalysis and photocatalytic degradation of phenolic compounds has been presented. The structural manipulation, challenges and application of g-C 3 N 4 photocatalysts by doping with non-metallic elements and molecules, formation of heterojunction photocatalytic system by g-C 3 N 4 with carbon quantum dots (CQDs) and ZnO photocatalyst have been discussed. In addition, detailed information regarding important roles of CQDs, metalloporphyrins photosensitizer and supporting carrier materials like hydroxyapatite in enhancement of photocatalytic activity has been focused.

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“…The quantum confinement effect in nanocrystals allows for the fabrication of materials with various properties from identical precursors just by changing reaction conditions [1]. Due to affordable methods of synthesis, high photostability, broad adsorption band and tunable luminescence capabilities, QDs are increasingly in demand as luminophores [2], photocatalysts [3], and luminescent markers for biological experiments [4].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy

et al. 2019

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Synthesis of nanoparticles doped with various ions can significantly expand their functionality. The conditions of synthesis exert significant influence on the distribution nature of doped ions and therefore the physicochemical properties of nanoparticles. In this paper, a correlation between the conditions of synthesis of manganese-containing cadmium sulfide or zinc sulfide nanoparticles and their optical and magnetic properties is analyzed. Electron paramagnetic resonance was used to study the distribution of manganese ions in nanoparticles and the intensity of interaction between them depending on the conditions of synthesis of nanoparticles, the concentration of manganese, and the type of initial semiconductor. The increase of manganese concentration is shown to result in the formation of smaller CdS-based nanoparticles. Luminescent properties of nanoparticles were studied. The 580 nm peak, which is typical for manganese ions, becomes more distinguished with the increase of their concentration and the time of synthesis.

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Quantum dot-decorated semiconductor micro- and nanoparticles: A review of their synthesis, characterization and application in photocatalysis

Cited by 147 publications

References 193 publications

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

Photocatalytic degradation of biological recalcitrant pollutants: a green chemistry approach

Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy

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