Optical properties of Cu-doped ZnO nanoparticles experimental and first-principles theory research

Zheng, Jiahong; Song, Junfeng; Jiang, Q.; Lian, Jianshe

doi:10.1007/s10854-012-0622-z

Cited by 21 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This modification was attributed to the induction of localized Cu 3d states in ZnO band gap [114]. The intra-band transition between Cu 3d and Zn 4s in the conduction band causes visible-light absorption in Cu-doped ZnO [115]. Substitution of Cu 2+ on the Zn 2+ sites was confirmed by the shrinkage of ZnO crystal lattice that caused the broadening and shifting of the XRD patterns toward larger 2θ [17].…”

Section: Cu-doped Znomentioning

confidence: 98%

Recent progress on doped ZnO nanostructures for visible-light photocatalysis

et al. 2016

View full text Add to dashboard Cite

Global environmental pollution and energy supply demand have been regarded as important concerns in recent years. Metal oxide semiconductor photocatalysts is a promising approach to apply environmental remediation as well as fuel generation from water splitting and carbon dioxide reduction. ZnO nanostructures have been shown promising photocatalytic activities due to their non-toxic, inexpensive, and highly efficient nature. However, its wide band gap hinders photo-excitation for practical photocatalytic applications under solar light as an abundant, clean and safe energy source. To overcome this barrier, many strategies have been developed in the last decade to apply ZnO nanostructured photocatalysts under visible light. In this review, we have classified different approaches to activate ZnO as a photocatalyst in visible-light spectrum. Utilization of various nonmetals, transition metals and rare-earth metals for doping in ZnO crystal lattice to create visible-light-responsive doped ZnO photocatalysts is discussed. Generation of localized energy levels within the gap in doped ZnO nanostructures have played an important role in effective photocatalytic reaction under visible-light irradiation. The effect of dopant type, ionic size and its concentration on the crystal structure, electronic property and morphology of doped ZnO with a narrower band gap is reviewed systematically. Finally, a comparative study is performed to evaluate two classes of metals and nonmetals as useful dopants for ZnO nanostructured photocatalysts under visible light.

show abstract

Section: Cu-doped Znomentioning

confidence: 98%

Recent progress on doped ZnO nanostructures for visible-light photocatalysis

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Formula of Cu‐doped ZnO can be expressed as Zn 1‐× Cu × O. The range of × value can be 0 ∼ 0.1, based on the theoretical calculations and experiment results . Based on the data in Table , the × value is about 0.04 for Cu‐doped ZnO in figure .…”

Section: Resultsmentioning

confidence: 98%

“…Substitution of copper into the ZnO lattice has shown to improve properties such as photocatalytic activity, gas sensitivity and magnetic semiconductivity . Up to now, Cu‐doped ZnO systems have been prepared using various synthetic approaches, such as magnetron sputtering , pulsed laser deposition , ion beam technique , sol−gel method , and chemical vapor deposition . Most of the investigations of Cu‐doped ZnO system have been focused on bulk materials or thin films, whereas only a few reports on nanostructures, such as nanoparticles , nanowires , nanorods have been published to date.…”

Section: Introductionmentioning

confidence: 99%

Fast synthesis of Cu‐doped ZnO nanosheets at ambient condition

Wang

You

et al. 2013

Crystal Research and Technology

View full text Add to dashboard Cite

A new, fast and low cost method to produce Cu-doped ZnO nanosheets is reported for the first time in this paper. Zinc foil specimens were immersed into CuSO 4 aqueous solutions with various concentrations for 3 seconds and then dried at ambient condition. The immersed specimens were characterized with a scanning electron microscope, an X-ray diffractometer and a transmission electron microscope. The results show that Cu-doped ZnO nanosheets with a multilayer structure on a cupper layer are formed. Cu-doped ZnO nanosheets show hexagonal crystalline structure and comprises polycrystalline grains with diameters of 5∼10 nm. A physical modal is suggested to explain the prepared Cu-doped ZnO nanosheet structure, based on the chemical reactions and a metallurgical cell.

show abstract

“…5, inset), 3.22 eV to 10 % and, 2.77 eV to 20 %. Therefore, the dopant increase in the zinc oxide structure decreases the band gap energy thereof, due to the lower band gap energy of cobalt oxide (1.4-1.8 eV) in the region of visible light [36,37].…”

Section: Photocatalysismentioning

confidence: 99%

Decolorization kinetics of the direct red 23 diazo dye from zinc/cobalt mixed oxide semiconductor using oxalate as a precursor

Neto

Orcelli

Silva

et al. 2015

Reac Kinet Mech Cat

View full text Add to dashboard Cite

In this paper, we report the oxidation kinetics of the Direct Red 23 diazo dye through the UV irradiation of an aqueous suspension of zinc/cobalt mixed oxide semiconductor at 30°C. The zinc and cobalt mixed oxide was prepared by the thermal decomposition of their oxalates, containing 5, 10, and 20 % (w/v) cobalt and calcined at 400°C for 12 h. The characterization of these oxides was performed by X-ray diffraction, thermal and thermo-gravimetric analysis, X-ray dispersive energy spectrometry, scanning electron microscopy, diffuse reflectance spectroscopy, and textural analysis to understand the physical and chemical behavior of these materials. The suspension, formed by synthesized oxide and the Direct Red 23 diazo dye, was kept for 60 min in the dark and, subsequently irradiated during 210 min. The decolorization rate constant, k obs , was determined under pseudo-first order conditions, maintaining the semiconductor concentration much larger than the diazo dye concentration, using the maximum Direct Red 23 absorbance at 503 nm, and plotting the natural logarithm as a function of irradiation time at 30°C. All the synthesized mixed oxides displayed higher photocatalytic activity in comparison to commercial zinc oxide. From these, the oxide containing 5 % cobalt showed the highest photocatalytic activity, resulting in a rate constant for the Direct Red 23 diazo dye equivalent to 14.0 9 10 -3 min -1 or 93 % decolorization at 30°C.

show abstract

Optical properties of Cu-doped ZnO nanoparticles experimental and first-principles theory research

Cited by 21 publications

References 23 publications

Recent progress on doped ZnO nanostructures for visible-light photocatalysis

Recent progress on doped ZnO nanostructures for visible-light photocatalysis

Fast synthesis of Cu‐doped ZnO nanosheets at ambient condition

Decolorization kinetics of the direct red 23 diazo dye from zinc/cobalt mixed oxide semiconductor using oxalate as a precursor

Contact Info

Product

Resources

About