Influence of Cu dopant on the morpho-structural and optical properties ZnO nanoparticles

Matei, Alina; Ţucureanu, Vasilica; Popescu, M.; Romanițan, Cosmin; Mihalache, Iuliana

doi:10.1016/j.ceramint.2019.02.158

Cited by 15 publications

(9 citation statements)

References 25 publications

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“…All the diffraction peaks can be indexed as hexagonal wurtzite-type ZnO (PDF: 96-230-114) and the anatase TiO 2 (PDF: 6-900-4140). It is evident that the hydrothermal treatment successfully achieved ZnO/TiO 2 heterojunctions that integrated the wurtzite phase ZnO nanostructures with the anatase TiO 2 [33][34][35]. It can be well observed that, for un-capped ZnO/TiO 2 composite structure (Fig.…”

Section: Structural and Morphological Analysismentioning

confidence: 76%

Stimulated generation of photobiogas by morphologically tuned nanostructured ZnO and ZnO/TiO2

et al. 2022

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The photocatalytic degradation (PCD) of ethanol in an inert atmosphere on catalysis was explored in a lab-scale experiment. A morphologically tuned nanostructured controlled ZnO and ZnO/TiO2 nanocomposites were synthesized using a simple hydrothermal process under the control of several functionally capping agents marking a milestone in photocatalysis. It is possible that this could be modified to produce photobiogas out of organic dye pollution. The photocatalysts were characterized by the use of X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer, Emmett, and Teller (BET) surface area analyzer, Scanning electron microscope (SEM-EDX), and UV–Vis absorption spectroscopy. The photocatalytic activity of the ZnO and ZnO–TiO2 composite nanostructures was evaluated for the photodegradation of the Tartrazine (Tr) dye aqueous solution. Where the composite matrix exhibits higher photocatalytic activity than pure ZnO nanomaterials as a result of the synergistic interaction between ZnO and TiO2 particles. This is mainly due to its higher surface area than pure ZnO. Moreover, the photocatalytic activity of the tuned nanostructured materials is found to be enhanced by the effect of the capping agent and controlling the morphology. This increase is accompanied by a significant shift in surface shape and band gap energy. According to the findings, the designed morphologies of pure ZnO photocatalyst impacted the formation of photobiogas from the photocatalytic decomposition of ethanol as a model of organic pollutants in wastewater. However, when using composite ZnO/TiO2 photocatalysts, the rate of CH4 formation is significantly lower than when using ZnO photocatalysts alone. This may be attributed to the synergetic effect between ZnO and TiO2 particles which leads to a remarkable reduction in the newly formed band gap energy. This may result in a fast rate of recombination between the photogenerated charge carriers (e− and h+).

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Section: Structural and Morphological Analysismentioning

confidence: 76%

Stimulated generation of photobiogas by morphologically tuned nanostructured ZnO and ZnO/TiO2

et al. 2022

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“…Typically, the presence of the defects such as impurity atoms occupying substitutional or interstitial lattice sites, vacancies, or self-interstitial would signi cantly alter the luminescent properties of synthesized ZnO samples. The remarkable reduction in visible PL intensity indicates that the defects are induced at the ZnO NPs surface [33], the improvement in the charge separation [36] during doping with P. chaudocanum extract, the interaction of P. chaudocanum extract to ZnO lattice structure to diminishes oxygen (vacancy) defects [39].…”

Section: Characteristics Of Zno Npsmentioning

confidence: 99%

“…The UV emission peak of all samples was observed at 387 and 405.5 nm. The emission peak at 387 nm was assigned to near-band edge emission (NBEM), which was caused by radiative recombination of the free exciton-exciton collision process [33] or related to free electron-hole recombination. [34] They are closely related to the band gap of ZnO.…”

Section: Characteristics Of Zno Npsmentioning

confidence: 99%

Green synthesis of ZnO dopped Piper chaudocanum leaf extract by co-precipitation method: characterization, antibacterial and anticancer activity

Tam¹

2023

Preprint

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In this study, zinc oxide nanoparticles (ZnO NPs) were synthesized from Piper chaudocanum leaf extract by co-precipitation method with different processes and extract volumes. Biosynthesized ZnO NPs were characterized by various techniques including XRD, FTIR, FESEM, PL test, UV-Vis DRS, and compared to chemically synthesized ZnO NPs. Most of the ZnO NPs samples were pure and had a hexagonal wurtzite phase. The particle sizes were about 22 to 40 nm and had a characteristic part of the Piper chaudocanum extract on the surface of ZnO NPs. The particle sizes, surface features and optical properties of samples depend on the order of the reaction steps and the extract volumes. The ZnO NPs synthesized by adding the extract to zinc acetate solution before adjusting pH were potent antimicrobial agents against pathogenic bacteria. The highest antibacterial activity was observed against P. aeruginosa (42 nm) and S. aureus (39 nm). Moreover, these ZnO NPs were moderately effective on KB cells with the IC50 value of 43.53 ± 2.98 µg/mL.

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“…It reveals the presence of peaks which correlate to JCPDS card No. 05-0661 and have a hexagonal wurtzite structure with the space group P63mc (186), including (110), ( 111), ( 111), ( 202), (020), ( 202), ( 113), (311) (113), and (222) [35,36].…”

Section: Powder X-ray Diffractionmentioning

confidence: 99%

Structural, electrochemical sensor and photocatalytic activity of combustion synthesized of novel ZnO doped CuO NPs

Rudresha¹,

Hussain

Ravikumar³

et al. 2023

Mater. Res. Express

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The solution combustion approach was used to synthesize the CuO-doped ZnO (CuO@ZnO) nanoparticles (NPs) from pure CuO at various concentrations of 5, 10, and 15%. Electron microscopy and X-ray diffraction (XRD) techniques were used to identify the production and structural studies of CuO@ZnO NPs (SEM). For the (111) strong peak, the average crystallite size was determined and was shown to decrease as the concentration of CuO increased. Kubelka-Munk theory was used to determine the optical band gap (Eg) of CuO@ ZnO NPs. The Eg values were found to be 2.6, 2.3, 2.20, and 2.16 eV for pure CuO, 5, 10, and 15 wt.% CuO@ZnO NPs, respectively. This corroborates that the optical band gap reduces with increasing the CuO atoms in the ZnO lattice. Under visible light illumination, the direct green (DG) and fast blue (FB) decolorization methods were used to estimate the photocatalytic performance of CuO with 10%ZnO NPs. These NPs' photocatalytic capabilities can be utilized in environmental applications to purify water. Electrochemical analysis using cyclic voltammetry revealed an improved redox potential output in the electrode crafted with graphite powder in 0.1 N HCl electrolyte solution. These CuO@ZnO electrodes were used because of their capacity to detect an extremely dangerous chemical like arsenic.

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Influence of Cu dopant on the morpho-structural and optical properties ZnO nanoparticles

Cited by 15 publications

References 25 publications

Stimulated generation of photobiogas by morphologically tuned nanostructured ZnO and ZnO/TiO2

Stimulated generation of photobiogas by morphologically tuned nanostructured ZnO and ZnO/TiO2

Green synthesis of ZnO dopped Piper chaudocanum leaf extract by co-precipitation method: characterization, antibacterial and anticancer activity

Structural, electrochemical sensor and photocatalytic activity of combustion synthesized of novel ZnO doped CuO NPs

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