CuO Rapid Synthesis with Different Morphologies by the Microwave Hydrothermal Method

Quirino, Max Rocha; Lucena, Guilherme Leocárdio; Medeiros, Jackson Andson; Santos, I. M. G.; Oliveira, Matheus José Cunha de

doi:10.1590/1980-5373-mr-2018-0227

Cited by 23 publications

(11 citation statements)

References 65 publications

(71 reference statements)

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“…As pictured in Figure 3, the plans of (110), (111), (202), ( 113) and (311) of CuO are perceived and identified by JCPDS no. 0045-0937 [31,32]. Besides this, the ZnO crystalline unit cell as (100), ( 102), (002), (110), ( 112) and ( 202) are shown in Figure 3, which matched with JCPDS no.…”

Section: Xrd Analysis Of Cuo/zno Nsssupporting

confidence: 68%

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

et al. 2021

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In this research study, we developed a voltammetric electrochemical sensor probe with a copolymer Nafion (Sulfonated Tetrafluoroethylene-based Fluoro-polymer) decorated with hydrothermally prepared sandwich-type CuO/ZnO nanospikes (NSs) onto a glassy carbon electrode (GCE) for reliable thiourea (TU) detection. The detailed characterizations in terms of structural morphology, binding energy, elemental compositions, grain size and crystallinity for synthesized NSs were performed by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. The differential pulse voltammetric (DPV) analysis for TU showed good linearity at current-versus-TU concentration on the calibration plot in the 0.15~1.20 mM range, which is defined as a dynamic detection range (LDR) of TU in a phosphate buffer solution. Considering the slope of LDR over the GCE-coated NSs surface area (0.0316 cm2), the TU sensor sensitivity (0.4122 µA µM−1 cm−2) was obtained. Besides this, the low limit (LOD) for TU detection was calculated and found to be 23.03 ± 1.15 µM. The fabricated Nafion/CuO/ZnO NSs/GCE sensor probe was created as a reliable sensor based on reproducibility, interference effect, stability and response time. Real bio-samples were investigated and the results confirm the anticipated reliability of the TU sensor probe. Thus, this is a noble way to develop enzyme-free electrochemical sensors that could be an alternative approach for the detection of chemicals in the field of enzyme-free biosensor development technology.

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Section: Xrd Analysis Of Cuo/zno Nsssupporting

confidence: 68%

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

et al. 2021

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“…Quirino et al [66] obtained similar results during the synthesis of copper oxide under hydrothermal conditions in microwave reactors (MHT):…”

Section: The Influence Of Cu 2+ Ions On the Calcium Silicate Hydratesmentioning

confidence: 76%

Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Dambrauskas

Knabikaite

Eisinas

et al. 2020

Journal of Asian Ceramic Societies

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This work aims to investigate the influence of Cr 3+ , Co 2+ and Cu 2+ on the formation of calcium silicates hydrates in CaO-SiO 2-Al 2 O 3-H 2 O system under hydrothermal conditions. The dry primary mixture with the molar ratio CaO/(SiO 2 + Al 2 O 3) = 1.5 and Al 2 O 3 /(Al 2 O 3 + SiO 2) = 0.05 was mixed with heavy metal nitrate solutions (metal ions concentration-10 g/l) to reach the water/solid ratio of the suspension equal to 10.0. The hydrothermal synthesis was carried out in unstirred suspensions, under saturated steam pressure at 200°C temperature for 0-72 hours. It was determined that nature of metal ions have influence on both mineral composition and thermal stability of synthesis products. It was obtained that by increasing synthesis temperature up to 200°C, all Cr 3+ and Co 2+ ions were intercalated into the structure of synthesis products. Meanwhile Cu 2+ ions participate in chemical reactions and as a result copper oxide were formed. The products of synthesis were characterized by STA, DSC, XRD and AAS analyses.

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“…Sample ZC100 is presented in Figure 5 i,j and it is formed of bipyramidal morphology. M. Quirino et al prepared CuO with a microwave hydrothermal method without any surfactants, and it resulted in a plate-like shape [ 53 ]. P. Gao et al prepared CuO with a hydrothermal method without any surfactants, and it resulted in a dumbbell-like morphology [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

Acacia nilotica Pods’ Extract Assisted-Hydrothermal Synthesis and Characterization of ZnO-CuO Nanocomposites

2022

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This work represents a novel combination between Acacia nilotica pods’ extract and the hydrothermal method to prepare nanoparticles of pure zinc oxide and pure copper oxide and nanocomposites of both oxides in different ratios. Five samples were prepared with different ratios of zinc oxide and copper oxide; 100% ZnO (ZC0), 75% ZnO: 25% CuO (ZC25), 50% ZnO: 50% CuO (ZC50), 25% ZnO: 75% CuO (ZC75), and 100% CuO (ZC100). Several techniques have been applied to characterize the prepared powders as FTIR, XRD, SEM, and TEM. The XRD results confirm the formation of the hexagonal wurtzite phase of zinc oxide and the monoclinic tenorite phase of copper oxide. The microscopy results show the formation of a heterostructure of nanocomposites with an average particle size of 13–27 nm.

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CuO Rapid Synthesis with Different Morphologies by the Microwave Hydrothermal Method

Cited by 23 publications

References 65 publications

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Acacia nilotica Pods’ Extract Assisted-Hydrothermal Synthesis and Characterization of ZnO-CuO Nanocomposites

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CuO Rapid Synthesis with Different Morphologies by the Microwave Hydrothermal Method

Cited by 23 publications

References 65 publications

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Influence of Cr3+, Co2+ and Cu2+ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Acacia nilotica Pods’ Extract Assisted-Hydrothermal Synthesis and Characterization of ZnO-CuO Nanocomposites

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Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C