Synthesis and characterization of CuO flower-nanostructure processing by a domestic hydrothermal microwave

Volanti, Diogo P.; Keyson, David V.; Cavalcante, L. S.; Simões, Alexandre Zirpoli; Joya, M. R.; Longo, Elson; Varela, José Arana; Pizani, P. S.; Souza, A. G.

doi:10.1016/j.jallcom.2007.05.023

Cited by 246 publications

(106 citation statements)

References 35 publications

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“…Moreover, modes at 284 (Ag), 333 (Ag), and 622 (Ag) cm −1 are comparable to the Raman active optical phonons of monoclinic CuO (C 6 2h space group), in good agreement with the previously reported data [30]. These modes may be superimposed to those of hematite and maghemite, evidencing that Cu addition has an impact on decreasing the crystallinity of the samples.…”

Section: Structure By Xrd and Ramansupporting

confidence: 89%

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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Nanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four different methods, the catalyst prepared via the NC and CM procedures enabled a partial incorporation of the Sn into the FeCo matrix forming a very active phase, namely the Heusler alloy. This was ascribed to the high initial dispersion of Sn as a promoter into the FeCo matrix, which led to available FeCoSn (FCS) particles well dispersed and stable on the catalyst surface. In the case of incorporating Mo or Cu to the nanosized FeCo catalyst, a poor stability towards leaching was observed when operating under the same reaction conditions. Cu was much less active than both Sn and Mo, mainly leading to acetophenone, ethylbenzene, 2-phenyl ethanol, 2-phenyl acetic acid, and 2-phenyl acetaldehyde products. The best catalytic results under the optimized reaction conditions, especially at 50 • C and styrene/H 2 O 2 molar ratio of 1 were achieved with nanosized FCS. This solid had a conversion of ca. 70% and selectivity for aldehydes of ca. 27%, and the selectivity for the condensation products was 29%.

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Section: Structure By Xrd and Ramansupporting

confidence: 89%

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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“…Figure 1 displays the XRD profiles of the CuO nanostructures synthesized using different concentrations of NaOH. All of the Bragg's reflections can be indexed to the monoclinic-phase [17][18][19] of CuO (space group C2/c), which is very close to the reported data (JCPDS 48-1548) whereas no characteristic peaks of any other impurities such as Cu(OH) 2 , Cu 2 O, or precursors used were observed. In all cases, peak broadening was observed, which depicts the nanostructural crystalline domains in CuO.…”

Section: Methodssupporting

confidence: 84%

Effect of precipitating agent NaOH on the preparation of copper oxide nanostructures for electrochemical applications

Balasubramaniam¹,

Balakumar²

2016

Nanosystems: Phys. Chem. Math.

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Copper oxide (CuO) nanostructures with different concentrations of sodium hydroxide for electrochemical applications such as supercapacitors have been synthesized using a simple and low-cost precipitation method. X-ray diffraction pattern confirmed the formation of CuO nanostructures without any impurities and further confirmed its highly crystalline, single phase, monoclinic nature. UV-diffuse reflectance spectral (UV-DRS) studies provided the absorption edge of the material and the estimated band gap value for the nanostructures were calculated using Kubelka-Munk (KM) absorbance plot that are determined to be around 4.74 -4.84 eV. Field emission scanning electron microscopy (FESEM) investigations revealed the morphology of the copper oxide nanocrystals and showed the increment of diameter of the CuO nanostructures. The electrochemical behavior of the CuO nanostructures were investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques which showed the stability, reversibility, symmetric and capacitive nature of the nanostructures.

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“…Intuitive software enables the user to control everything from process conditions (temperature, time and heating rate). The user simply defines the desired temperature-time profile, and the MAH will automatically carry out the programmed cycle [9,10]. After MAH treatment, the white precipitate was washed with distilled water and dried at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the MAH method has been successfully employed to obtain materials, such as ZnO [8], BaTiO 3 [9], CuO [10] and CeO 2 [11].…”

Section: Introductionmentioning

confidence: 99%

Indium hydroxide nanocubes and microcubes obtained by microwave-assisted hydrothermal method

Motta¹,

Lima²,

Marques³

et al. 2010

Journal of Alloys and Compounds

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Synthesis and characterization of CuO flower-nanostructure processing by a domestic hydrothermal microwave

Cited by 246 publications

References 35 publications

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

Effect of precipitating agent NaOH on the preparation of copper oxide nanostructures for electrochemical applications

Indium hydroxide nanocubes and microcubes obtained by microwave-assisted hydrothermal method

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