Ultrasonic-assisted synthesis and photocatalytic performance of ZnO nanoplates and microflowers

Phuruangrat, Anukorn; Thongtem, Somchai; Thongtem, Titipun

doi:10.1016/j.matdes.2016.06.045

Cited by 52 publications

(5 citation statements)

References 46 publications

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“…This technique is known to be susceptible to the local structure of ions, and it is now generally accepted that the positions and half-widths of the hexagonal bands are influenced by the preparation method, impurities, and oxygen vacancies [17,27]. Raman active modes of the wurtzite structure (space group P63mc) in the ZnO phase have six first-order vibrational modes, named A 1 , E 1 , 2E 2 , and 2B 1 , and are expected to appear near the point of their first Brillouin zone [30]. Raman spectra of ZnO, ZnO-Al, and ZnO-Ni showed peaks at 429 cm −1 , 490 cm −1 , 604 cm −1 , and 707 cm −1 .…”

Section: Structure From Xrd Patterns and Raman Spectramentioning

confidence: 99%

Synthesis and Characterization of Nanocrystalline ZnO Doped with Al3+ and Ni2+ by a Sol–Gel Method Coupled with Ultrasound Irradiation

et al. 2018

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Zinc oxide is one of the most important semiconducting metal oxides and one of the most promising n-type materials, but its practical use is limited because of both its high thermal conductivity and its low electrical conductivity. Numerous studies have shown that doping with metals in ZnO structures leads to the modification of the band gap energy. In this work, Al-doped ZnO, Ni-doped ZnO, and undoped ZnO nanocrystalline powders were prepared by a sol–gel method coupled with ultrasound irradiation, and the results show the influence of Al3+ and Ni2+ ions in the ZnO network. The doping concentrations in ZnO of 0.99 atom % for ZnO–Al and 0.80 atom % for ZnO–Ni were obtained by X-ray Fluorescence (XRF). X-ray Diffraction (XRD) and Raman Spectroscopy showed a decreased intensity and broadening of main peaks, indicating metallic ions. The crystallite size of the sample was decreased from 24.5 nm (ZnO) to 22.0 nm (ZnO–Al) and 21 nm (ZnO–Ni). The textural and morphological properties were analyzed via Nitrogen Adsorption (BET method) and Field Emission Scanning Electron Microscopy (FESEM).

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Section: Structure From Xrd Patterns and Raman Spectramentioning

confidence: 99%

Synthesis and Characterization of Nanocrystalline ZnO Doped with Al3+ and Ni2+ by a Sol–Gel Method Coupled with Ultrasound Irradiation

et al. 2018

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“…6(d), the C1s spectra of the ZCT20 samples show four peaks, which was originated from the carbon atoms in different functional groups. The peaks at 284.44 and 285.46 eV was ascribed to the C = C and C-C, respectively [48]. The peak located at 286.17 eV was attributed to C-OH bond, while the peak at 288.83 eV was attributed to C-COOH bond [49,50].…”

Section: Xps Analysismentioning

confidence: 99%

Photocatalytic Activity and Antibacterial Properties of ZnO/CNTs Composites

Zhu,

Pan,

Wang

et al. 2024

JNanoR

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Photocatalytic technology is one of the promising technologies for wastewater treatment. Herein, zinc oxide/multi-walled carbon nanotubes (ZnO/CNTs) photocatalyst was successfully prepared by hydrothermal method with combining in-situ synthesis technology. The micro-morphology, crystalline structure, surface chemical elements, and optical properties were characterized by SEM, TEM, XRD, FTIR, UV-Vis, and DRS technologies. The ZnO/CNTs photo-catalyst exhibited enhancement photo activity for degradation of organic pollutants under simulated light irradiation. Specifically, the photo-catalytic activity of the ZnO/CNTs catalysts improved with the rise of CNTs content in the composites. Investigation on the photo-degradation mechanism verified that the presence of CNTs in the catalyst not only optimized the band structure of ZnO semiconductor but also contributed to the transfer of photo-generated electrons and reducing the recombination of electron-hole pairs due to its excellent conductivity. Moreover, the active radical groups such as superoxide radical (O-2), hole (h+), and hydroxyl radical (·OH) played the dominated role for the pollutants degradation under the simulated sunlight irradiation. In addition, ZCT20 catalysts and light irradiation had synergistic effects on antibacterial activity, whose antibacterial rates against E. coli and S. aureus were up to 99.96% and 99.94%, respectively. Investigation on antibacterial mechanisms revealed that the existence of ROS and the continuous release of Zn2+ played an important role for improving the antibacterial activity of the ZCT20 catalyst under the simulated sunlight irradiation.

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“…In addition, ultrasonically synthesized three different ZnO nanostructures by adjusting the solution pH: nanoplates (pH 7), multi‐layered nanorod petal flowers (pH 8–9), and micro flowers of nanoneedles with pyramid tips (pH 10) were used for degradation of methylene blue (MB) under UV irradiation. [ 89 ] Hexagonal ZnO nanoplates degraded 97.54% MB, much higher than multi‐layered nanorod petal flowers (67.27–77.82%) and micro flowers of nanoneedles with pyramid tips (89.10%). After the fifth cycle degradation efficiency of hexagonal ZnO nanoplates and ZnO flowers of nanoneedle petals with the hexagonal pyramid, tips were reduced to only 2%.…”

Section: Applicationsmentioning

confidence: 99%

2D Zinc Oxide – Synthesis, Methodologies, Reaction Mechanism, and Applications

Patil

Jagdale

Singh³

et al. 2023

Small

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and electronic properties compared to the bulk counterpart, which is subjected to the confinement of electrons in two dimensions in the former case. 2D nanosheets are a class of 2D nanomaterial consisting of sheet-like structures with lateral sizes ranging from a few nanometers to hundreds of micrometers [1] and widely being employed in electronic devices, [2][3][4][5] catalysis, [6][7][8] energy storage and conversion, [9,10] sensing, [11,12] and biomedicine. [13] In literature, numerous 2D nanostructures such as hexagonal boron nitride (h-BN), [14][15][16][17] transition metal dichalcogenides (TMDs), [1,[18][19][20][21] graphitic carbon nitride (g-C 3 N 4 ), [22,23] layered metal oxides, [24,25] layered double hydroxides (LDHs), [25,26] black phosphorus (BP), [27,28] silicene [29][30][31] and antimonene [32][33][34] have been engineered and subsequently, being utilized for various applications including catalysis, optoelectronics, energy storage/ conversion applications, etc.The 2D nanostructures are mainly categorized into "nonlayered" and "layered" crystal structures. So far, the exploration of 2D nanostructures has been restricted to naturally layered materials, that is, van der Waals (vdW) solids with strong in-plane chemical bonds but weak out-of-plane vdW bonds. These 2D layered materials are comprehensively investigated due to the single or few-layer nanosheet, which can be synthesized either by a top-down approach such as mechanical exfoliation, liquid exfoliation, etc., or a bottom-up approach such as chemical vapor deposition (CVD), wet chemical synthesis, etc. In definition, the naturally layered materials such as TMDs, MXenes, BP, etc. can be easily exfoliated or grown as atomically thin nanosheets due to the strong inplane chemical bonds but weak out-of-plane vdW bonds. [35,36] However, in recent years 2D nanomaterials on nonlayered crystal structures have been reported, such as ZnO, RuO 2 , IrO 2, etc. [35,37] Due to the inherent isotropic chemical bonds in three dimensions, the synthesis of 2D morphology is not as facile as the case of vdW solids, which requires stabilization of crystal structures far from thermodynamic equilibrium. Also, the typical thickness of these nonlayered 2D materials can be of a few layers of unit cells (0.5 nm to >10 nm) due to the absence of an intrinsic layered configuration. Therefore, 2D nanosheets of nonlayered materials Zinc oxide (ZnO) is a thermally stable n-type semiconducting material. ZnO 2D nanosheets have mainly gained substantial attention due to their unique properties, such as direct bandgap and strong excitonic binding energy at room temperature. These are widely utilized in piezotronics, energy storage, photodetectors, light-emitting diodes, solar cells, gas sensors, and photocatalysis. Notably, the chemical properties and performances of ZnO nanosheets largely depend on the nano-structuring that can be regulated and controlled through modulating synthetic strategies. Two synthetic approaches, top-down and bottom-up, are mainly employed for preparing Z...

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Ultrasonic-assisted synthesis and photocatalytic performance of ZnO nanoplates and microflowers

Cited by 52 publications

References 46 publications

Synthesis and Characterization of Nanocrystalline ZnO Doped with Al3+ and Ni2+ by a Sol–Gel Method Coupled with Ultrasound Irradiation

Synthesis and Characterization of Nanocrystalline ZnO Doped with Al3+ and Ni2+ by a Sol–Gel Method Coupled with Ultrasound Irradiation

Photocatalytic Activity and Antibacterial Properties of ZnO/CNTs Composites

2D Zinc Oxide – Synthesis, Methodologies, Reaction Mechanism, and Applications

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