Preparation of CuO nanoparticles by microwave irradiation

Wang, Hui; Xu, Jinzhong; Zhu, Jun‐Jie; Chen, Hong‐Yuan

doi:10.1016/s0022-0248(02)01571-3

Cited by 537 publications

(182 citation statements)

References 34 publications

Supporting

Mentioning

172

Contrasting

Unclassified

Order By: Relevance

“…increasing ω values as in Table 1) by extrapolating the straight line of the ( hυ) 2 vs. hυ plot to intercept on the horizontal photon energy axis as shown in Figure 7b. The energy band gap of the as prepared CuO nanocrystals is estimated to be between 2.71eV and 2.16 eV which is larger than the reported value of bulk CuO (Eg = 1.85eV) [12]. The increase in the band gap of the CuO nanocrystals with the decrease in particle size is attributed to a quantum confinement effect [69].A correlation of mean size and energy bandgap with ω is shown in figure 8.…”

Section: Uv-visible-nir Spectroscopymentioning

confidence: 80%

“…The material is a direct bandgap semiconductor. It couples a narrow band gap (Eg = 1.2 eV -1.8 eV) [10][11][12] with a set of properties such as high-temperature superconductivity and good photoconductivity and photochemical properties [13]. This largely explains the growth of applications in the last years in the more diverse fields such as solar cells [14], gas sensors [15], field emission (FE) emitters [16], and lithium ion battery electrode materials [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microemulsion Synthesis of Copper Oxide Nanorod-Like Structures

Dodoo‐Arhin

Leoni

Scardi

2012

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

Copper oxide (CuO) nanorod-like structures made of spherical nanocrystals were synthesized at moderate temperature (80°C) starting from CuCl 2 •2H 2 O crystals in a water/n-heptane microemulsion stabilised by the nonionic Brij-30 surfactant. Whole Powder Pattern Modelling of the X-ray diffraction pattern shows absence of linear and planar defects with crystalline domains in the range of 4 -8 nm. A linear correlation between the average size of the particles and the quantity of water in the system was observed: all synthesised specimens show a large blue shift of the energy bandgap (up to 2.7 eV versus 1.2 eV of bulk CuO) resulting from quantum confinement effects. The mechanism of growth of the spherical nanoparticles into nanorod-like structures has been elucidated.

show abstract

Section: Uv-visible-nir Spectroscopymentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Microemulsion Synthesis of Copper Oxide Nanorod-Like Structures

Dodoo‐Arhin

Leoni

Scardi

2012

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

show abstract

“…6). The bandgap of CuAl 2 O 4 , E g (eV), could be calculated from the absorption limit wavelength k 0 (nm), from the equation [40][41][42]: ahm = A(hm-E g ) m/2 , where a is the absorption coefficient, hm is the frequency of photons, A is a proportionality constant and m = 4 for indirect transitions. To determine the band gap we have plotted as function of (hm-E g ) in (Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of spinel-type CuAl2O4 nanocrystalline by modified sol–gel method

Salavati‐Niasari

Davar

Farhadi

2009

J Sol-Gel Sci Technol

144

View full text Add to dashboard Cite

Nanocrystalline Copper aluminate (CuAl 2 O 4 ) was prepared by sol-gel technique using aluminum nitrate, copper nitrate, diethylene glycol monoethyl ether and citric acid were used as precursor materials. This method starts from of the precursor complex, and involves formation of homogeneous solid intermediates, reducing atomic diffusion processes during thermal treatment. The formation of pure crystallized CuAl 2 O 4 nanocrystals occurred when the precursor was heat-treated at 600°C in air for 2 h. The stages of the formation of CuAl 2 O 4 , as well as the characterization of the resulting compounds were done using thermo-gravimetric analysis, X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. The products were analyzed by transmission electron microscopy and ultraviolet-visible (UV-Vis) spectroscopy to be round, about 17-26 nm in size and E g = 2.10 eV.

show abstract

“…This method has been successfully applied for the preparation of a variety of nano-sized inorganic materials. The microwave synthesis, which is generally quite fast, simple, and energy efficient, has been developed, and widely used for TiO 2 nanoparticles 14 , metal (Cu, Hg, Zn, Bi, Pb) sulfide nanoparticles 15 , uniform and stable polymer-stabilized colloidal clusters of Pt, Ir, Rh, Pd, Au and Ru 16 , CuO 17 etc. Compared with conventional heating, microwave heating has an advantage of high efficiency and rapid formation of nanoparticles with a nano-size distribution and less agglomeration.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CeO2 nanocrystals by solvothermal route

Kumar¹,

Selvarajan²,

Muthuraj

2013

Mat. Res.

View full text Add to dashboard Cite

Cerium dioxide nanoparticles were prepared by solvothermal technique. The structural analysis was carried out using X-ray diffraction. It showed that the cerium dioxide nanoparticles exhibited cubic structure. Grain sizes were estimated from High Resolution Transmission Electron Microscopy images. The size of the nanoparticles is around 20 nm. The surface morphological studies from Scanning Electron Microscope (SEM) and HRTEM depicted spherical particles with formation of clusters. Thermal and electrical Insulating behaviors were determined.

show abstract

Preparation of CuO nanoparticles by microwave irradiation

Cited by 537 publications

References 34 publications

Microemulsion Synthesis of Copper Oxide Nanorod-Like Structures

Microemulsion Synthesis of Copper Oxide Nanorod-Like Structures

Synthesis and characterization of spinel-type CuAl2O4 nanocrystalline by modified sol–gel method

Synthesis and characterization of CeO2 nanocrystals by solvothermal route

Contact Info

Product

Resources

About