Complex-directed hybridization of CuO/ZnO nanostructures and their gas sensing and photocatalytic properties

Yang, Chao; Cao, Xudong; Wang, Shoujiang; Zhang, Lu; Xing, Feng; Su, Xintai; Wang, Jide

doi:10.1016/j.ceramint.2014.09.120

Cited by 58 publications

(11 citation statements)

References 23 publications

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“…The FT-IR spectra of the pure ZnO and CuO nanofibers and composite samples with low and high percentages of CuO are shown in Figure . As expected, the characteristic peaks of inorganic metal oxides emerge in the fingerprint region of the FT-IR spectrum (400–700 cm –1 ) . The peaks at 583 and 527 cm –1 are attributed to the Cu–O stretching vibrations .…”

Section: Resultssupporting

confidence: 77%

“…As expected, the characteristic peaks of inorganic metal oxides emerge in the fingerprint region of the FT-IR spectrum (400−700 cm −1 ). 33 The peaks at 583 and 527 cm −1 are attributed to the Cu−O stretching vibrations. 34 The emerged characteristic peak of Zn−O stretching vibration at 439 cm −1 confirms the formation of pure inorganic metal oxide.…”

Section: Resultsmentioning

confidence: 99%

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Tuning Composition of Electrospun ZnO/CuO Nanofibers: Toward Controllable and Efficient Solar Photocatalytic Degradation of Organic Pollutants

Naseri¹,

Samadi²,

Mahmoodi³

et al. 2017

J. Phys. Chem. C

132

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ZnO/CuO nanofibers, with different CuO concentrations, were fabricated by one-step electrospinning of the polymer precursor and annealing in air. Scanning electron microscopy (SEM) showed smooth and beadless morphology for the synthesized nanofibers, while X-ray diffraction (XRD) analysis revealed formation of hexagonal and monoclinic crystalline structure phases for ZnO and CuO nanofibers, respectively. X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of CuO on the surface of ZnO nanofibers. For further confirming the formation of chemical bonds, Fourier transform infrared (FT-IR) spectroscopy was employed. The effect of Cu contents in the overall electronic band structure of ZnO was explained by density functional theory (DFT) calculations. Diffuse reflectance spectroscopy (DRS) showed that the ZnO band gap energy reduced with increasing amount of CuO contents due to the presence of the Cu(3d) energy states above the valence band. Comparing the photocatalytic activity of ZnO/CuO nanofiber samples with different CuO concentrations under similar sunlight irradiation conditions revealed that the ZnO/(0.5 wt %) CuO sample exhibited the highest performance among all samples. This was explained by an effective suppression of electron–hole recombination as verified by both photoluminescence (PL) and photocurrent density measurements. By means of charge carrier scavengers, it was found that holes and hydroxyl radicals are the main surface species for photocatalytic degradation of methylene blue (MB) over the ZnO/(0.5 wt %) CuO nanofiber. Furthermore, the optimized sample demonstrated great activity for the degradation of bisphenol A (BPA) with a rate constant of 3.4 × 10–2 min–1. Finally, a photocatalytic degradation mechanism based on the main reactive oxygen species (ROS) and calculated band positions was proposed.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Tuning Composition of Electrospun ZnO/CuO Nanofibers: Toward Controllable and Efficient Solar Photocatalytic Degradation of Organic Pollutants

Naseri¹,

Samadi²,

Mahmoodi³

et al. 2017

J. Phys. Chem. C

132

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“…Figure 1 (a) shows XRD patterns for both ZCO-H and ZCO-CS particles, respectively. The recorded patterns exhibit all of the major peaks of a monoclinic CuO phase (JCPDS:48-1548) and also a hexagonal wurtzite ZnO phase (JCPDS:36-1451) for both samples (27,28). The variation in peak positions and their corresponding intensities can be attributed to the change of synthesized methods as a hybrid structure and also the core ZnO and CuO shell in the ZnO/CuO.…”

Section: Characterization Of Synthesized Nanoparticlesmentioning

confidence: 91%

“…The ZnO/CuO hybrid and ZnO/CuO core-shell particle (1:1 ratio) samples were synthesized similarly, as based on the literature (27,28). 0.25 M (Zn(CH3COO)2×2H2O) and 0.25 M (Cu(CH3CHOO)2×2H2O) solutions were stirred with the addition of NaOH pellets to prepare the ZnO/CuO hybrid composites.…”

Section: Synthesis Of Zno/cuo Particles Via Two Methodsmentioning

confidence: 99%

Improvement of The CO2 Sensitivity of HPTS Along With ZnO/CuO Nanoparticles: A Comparative Study Between Core-Shell And Hybrid Structures

Oğuzlar

2021

Journal of the Turkish Chemical Society Section A: Chemistry

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Semiconductor metal oxide materials have gained huge attention in gas sensors owing to their high sensitivity to many target gases. Herein, ZnO/CuO core-shell and ZnO/CuO hybrid, which were synthesized by different sol-gel methods and formed in two different crystal structures, were used as an additive material to enhance the response range of 8-hydroxypyrene-1, 3, 6-trisulfonic acid (HPTS) for the sensing of gaseous carbon dioxide. Metal oxide materials were characterized by using XPS, XRD, FTIR, SEM, UV-Vis, and PL spectroscopy. The HPTS dye along with the ZnO/CuO hybrid material displayed a higher CO2 gas sensitivity as 94% ratio (I0/I100=16.90) and Stern-Volmer constant (KSV) value and extended linear response range compared to the HPTS-based sensing thin films along with ZnO/CuO coreshell material and additive-free form. ZnO/CuO core-shell and hybrid structures were used for enhancing of carbon dioxide sensitivity of the HPTS dye.

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“…ZnO has been used Synthesis of Zinc-Copper-Iron(II, III) Oxide Nanoand Shreemant V. Rathod composites and their Photocatalytic Efficiency for Crystal Violet Degradation for degradation of organic dyes, such as methyl orange (21), crystal violet (22)(23), Rhodamine B (24), and methylene blue (25)(26). ZnO/CuOcombined metal oxide semiconductors have been found to show higher photocatalytic activity under both UV and visible light irradiation than either pure ZnO or CuO (27)(28)(29)(30). The coupled semiconductor materials have two types of energy-level systems, which play significant roles in realizing charge separation.…”

mentioning

confidence: 99%

Synthesis of Zinc-Copper-Iron(II, III) Oxide Nanocomposites and their Photocatalytic Efficiency for Crystal Violet Degradation

2021

MJCHEM

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The synthesis, characterization, and application of metal oxide nanocomposites have received increasing interest in the field of nanoscience and technology with several possible opportunities. Nanocomposites containing two or more dissimilar band gaps semiconductors provide exceptional properties to photocatalysts. A simple chemical co-precipitation method was employed to synthesize ZnO:CuO:Fe2O3 mixed metal oxide nanocomposites followed by calcination at 500 0 C. The prepared nanocomposites were characterized by XRD, FTIR, SEM, and TEM. The FTIR and XRD spectra confirmed the characteristic vibrations of ferrite atoms along with Cu-O and Zn-O vibrations. The crystallite particle size calculated by Debye Scherrer formula matched the size obtained by SEM and TEM images. The photocatalytic efficiency of the ZnO:CuO:Fe2O3 nanocomposites was assessed using crystal violet dye in the presence of sunlight. Variation in the concentration of Cu with respect to zinc in the nanocomposites enhanced photodegradation efficiency in this investigation. Our results indicated that the variation in the composition of ternary nanocomposite catalysts influence the competence for dye removal from waste water.

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Complex-directed hybridization of CuO/ZnO nanostructures and their gas sensing and photocatalytic properties

Cited by 58 publications

References 23 publications

Tuning Composition of Electrospun ZnO/CuO Nanofibers: Toward Controllable and Efficient Solar Photocatalytic Degradation of Organic Pollutants

Tuning Composition of Electrospun ZnO/CuO Nanofibers: Toward Controllable and Efficient Solar Photocatalytic Degradation of Organic Pollutants

Improvement of The CO2 Sensitivity of HPTS Along With ZnO/CuO Nanoparticles: A Comparative Study Between Core-Shell And Hybrid Structures

Synthesis of Zinc-Copper-Iron(II, III) Oxide Nanocomposites and their Photocatalytic Efficiency for Crystal Violet Degradation

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