Morphology-controlled synthesis of CuO nano- and microparticles using microwave irradiation

Jung, Alum; Cho, Seungho; Cho, Won Joon; Lee, Kun-Hong

doi:10.1007/s11814-011-0168-4

Cited by 22 publications

(9 citation statements)

References 48 publications

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“…Several methods for the synthesis of CuO nanoparticles have been reported by researchers and had resulted with different morphology, compositions, and the size of the CuO nanoparticles. Most frequently used and the easiest way of synthesizing CuO nanoparticles are hydrothermal, chemical precipitation, Solid-state thermal conversion of precursors, electrochemical method, microwave irradiation, sol-gel process, microemulsion, sonochemical method, and other combining methods [22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasound power and calcination temperature on the sonochemical synthesis of copper oxide nanoparticles for textile dyes treatment

Saravanan

Sivasankar

2015

Env Prog and Sustain Energy

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Copper oxide (CuO) nanoparticles were synthesized by sonochemical technique using copper nitrate trihydrate and ammonium carbonate as precursors in the presence of polyethylene glycol (PEG). The reagents aqueous solution are exposed to ultrasound at different ultrasound power of 44, 66, 88, 110, and 132 W. The precipitated product was calcined at the temperatures of 4008C, 5008C, 6008C, and 7008C. The size, structure, and morphology of calcined CuO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energydispersive X-ray spectroscopy (EDAX). From the XRD observation, it is evident that the high purity CuO nanoparticles ranging from approximately 14 to approximately 54 nm were obtained. Additionally, SEM and EDAX investigation revealed that its structure and particle size are strongly dependent on the calcination temperature than ultrasound power. Most of the CuO nanoparticles formed were spherical in shape. Further, the application of the synthesized CuO nanoparticles toward the treatment of textile organic dyes such as Reactive Black 5 and Basic Blue 3 showed the synthesized CuO was highly effective in degradation of the environmental pollutants.

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Section: Introductionmentioning

confidence: 99%

Effect of ultrasound power and calcination temperature on the sonochemical synthesis of copper oxide nanoparticles for textile dyes treatment

Saravanan

Sivasankar

2015

Env Prog and Sustain Energy

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“…However, [Cu(OH) 4 2− ] is more stable than Cu[NH 3 ] 4 2+ because the bond strength of the complexes follows the order OH − >NH 3 . This is reflected in their stability constant, i. e., 12.4±0.3 (at 25 °C) for Cu[NH 3 ] 4 2+ and 15.5±0.1 (at 20 °C) for [Cu(OH) 4 2− ] [41] . Hence the unstable Cu[NH 3 ] 4 2+ undergoes a coordination self‐assembly mechanism by which NH 3 ligands are replaced by the available OH ‐ ligands to form [Cu(OH) 4 2− ].…”

Section: Resultsmentioning

confidence: 99%

“…Finally, an interior cavity is generated via a core evacuation process to give a hollow sphere structure of CuO (Scheme 3). [43,41] …”

Section: Resultsmentioning

confidence: 99%

CuO{001} as the Most Active Exposed Facet for Allylic Oxidation of Cyclohexene via a Greener Route

2020

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Allylic oxidation of olefins to α,β‐unsaturated carbonyl compounds, especially2‐cyclohexen‐1‐one, by the oxidation of cyclohexene is a prime chemical transformation in the organic industry due to its immense application as an intermediate in the synthesis of fine chemicals, pharmaceutical products, and perfumery products. Herein, we demonstrate microstructured copper oxide (CuO) as an efficient catalyst to oxidize cyclohexene to 2‐cyclohexen‐1‐oneand other value‐added intermediates in the presence of aerobic molecular oxygen as oxidant at 80 °C with outstanding conversion of cyclohexene and high selectivity towards 2‐cyclohexen‐1‐one. CuO with diverse shapes was synthesized by a one‐step hydrothermal method. CuO plates (PLs) and flowers (FLs) were obtained by varying the ammonia and sodium hydroxide concentration, and CuO spheres (SPs) and hollow spheres (HSs) were prepared by varying the urea concentration. Under optimized conditions, the CuO FL2 catalyst shows the highest conversion of cyclohexene (97.6 %) due to its smaller size, higher surface charge, and high‐energy {001} exposed facets. Reaction parameters such as reaction temperature, reaction duration, and catalyst concentration were varied to obtain the optimal reaction conditions for cyclohexene oxidation. Moreover, the CuO FL2 catalyst was recycled several times without any significant loss of catalytic activity, which ascertains recyclability and high stability of the catalyst for industrial use.

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“…Then, 10 ml of the solution was irradiated using a temperature-controlled microwave synthesis system (2.45 GHz, single-mode, Greenmotif, IDX, Tochigi, Japan) at 100°C. 30 For gold replacement of CuO, 250 μl of a gold precursor solution (HAuCl 4 •3H 2 O, 1.0 × 10 − 3 mol, Aldrich Inc.) was added to 10 ml of the solution containing CuO. The molar ratio of (HAuCl 4 )/(Cu(NO 3 ) 2 ) was 0.25.…”

Section: Fabrication Of Colloidal Gold Nanoparticles With Open Eccentmentioning

confidence: 99%

“…The hydrothermal process with microwave irradiation is very effective for producing metal nanoparticles with very rough surfaces, similar to hyperbranched sharp multi-tips because of the rapid heating and low synthesis temperature. 29,30 The fabricated 3D colloidal gold nanoparticles with open eccentric cavities exhibited very high SERS signal intensities with excellent reproducibility, which is sufficient to detect a trace amount of adenine, one of the four bases in DNA, in an aqueous solution. [31][32][33][34][35] The highly intense SERS signal was attributed to both the open eccentric cavity and very rough surfaces resulting from the uniformly covered hyperbranched sharp multi-tips of the colloidal gold nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic colloidal nanoparticles with open eccentric cavities via acid-induced chemical transformation

et al. 2015

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Surface-enhanced Raman spectroscopy (SERS) has been considered a promising technique for the detection of trace molecules in biomedicine and environmental monitoring. The ideal metal nanoparticles for SERS must not only fulfill important requirements such as high near-field enhancement and a tunable far-field response but also overcome the diffusion limitation at extremely lower concentrations of a target material. Here, we introduce a novel method to produce gold nanoparticles with open eccentric cavities by selectively adapting the structure of non-plasmonic nanoparticles via acid-mediated surface replacement. Copper oxide nanoparticles with open eccentric cavities are first prepared using a microwave-irradiation-assisted surfactant-free hydrothermal reaction and are then transformed into gold nanoparticles by an acidic gold precursor while maintaining their original structure. Because of the strong near-field enhancement occurring at the mouth of the open cavities and the very rough surfaces resulting from the uniformly covered hyperbranched sharp multi-tips and the free access of SERS molecules inside of the nanoparticles without diffusion limitation, adenine, one of the four bases in DNA, in an extremely diluted aqueous solution (1.0 pM) was successfully detected with excellent reproducibility upon laser excitation with a 785-nm wavelength. The gold nanoparticles with open eccentric cavities provide a powerful platform for the detection of ultra-trace analytes in an aqueous solution within near-infrared wavelengths, which is essential for highly sensitive, reliable and direct in vivo analysis. INTRODUCTIONThere is a strong demand for trace-molecule detection techniques that are simple, rapid, highly sensitive and reproducible, spanning from diagnostics in medicine to the detection of base sequence mutation. Surface-enhanced Raman spectroscopy (SERS) could be a promising candidate for extremely sensitive molecular finger-printing techniques that fulfill these technological and detection system criteria. 1 SERS is a near-field phenomenon that relies on the intensified electric fields (E-fields) on a metal nanostructure when its localized surface plasmon resonance is excited by light. 2 These enhanced E-fields lead to a large enhancement of the Raman scattering signal. 3 Although the hot spots exhibiting these intensively localized E-fields that are usually expected between two (or multiple) noble metal nanoparticles and the sharp nanoscale tips can amplify Raman signals by 410 6 times for trace molecule detection, 4,5 they are not easily obtained. 6,7 Several attempts have been made to increase the sensitivity and reproducibility for active SERS substrates. Two-dimensional arrays of various SERS-active substrates were introduced 8,9 but were not suitable for detection in solution or in an in vivo system because of

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Morphology-controlled synthesis of CuO nano- and microparticles using microwave irradiation

Cited by 22 publications

References 48 publications

Effect of ultrasound power and calcination temperature on the sonochemical synthesis of copper oxide nanoparticles for textile dyes treatment

Effect of ultrasound power and calcination temperature on the sonochemical synthesis of copper oxide nanoparticles for textile dyes treatment

CuO{001} as the Most Active Exposed Facet for Allylic Oxidation of Cyclohexene via a Greener Route

Plasmonic colloidal nanoparticles with open eccentric cavities via acid-induced chemical transformation

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