ZnO:Mn:Cu nanowires prepared by template method

Enculescu, Ionuţ; Sima, M.; Enache, Mihaela; Vasile, Eugeniu; Ansermet, Jean-Philippe

doi:10.1002/pssb.200675126

Cited by 41 publications

(34 citation statements)

References 14 publications

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“…Switzer [13] showed that Cu 2 O can be obtained at the working electrode at pH = 9-12. Our optical measurements [6] proved the presence in a ZnO : Mn : Cu film of both cupric and cuprous oxides; therefore, we consider that a part of Cu 2+ ions from solution can be precipitated together with Zn 2+ and Mn 2+ ions, taking into account the small values for solubility products of the formed hydroxides.…”

Section: Voltammetric Characterization Of Doped Zno Electrodepositionsupporting

confidence: 53%

“…[1 -5] The electrochemical deposition was employed for preparation of Mn-and Cu-doped ZnO semiconductor both as a film on the platinum electrode and as nanowire arrays in the polycarbonate membrane. [6] The template method for electrosynthesis of semiconductor nanowires involves the deposition of a metal thin film on one side of the membrane.…”

Section: Introductionmentioning

confidence: 99%

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EIS studies of electrodeposition process of manganese and copper doped ZnO wires

Enculescu

Sima

Vasile

et al. 2008

Surface & Interface Analysis

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Electrodeposition of manganese-and copper-doped ZnO wires into polycarbonate membranes, from an aqueous solution containing 0.05 mol dm −3 Zn(NO 3 ) 2 + 0.01 mol dm −3 Mn(NO 3 ) 2 + 0.0005 mol dm −3 Cu(NO 3 ) 2 + 0.0075 mol dm −3 lactic acid, pH = 4.7 was investigated using linear sweep voltammetry and electrochemical impedance spectroscopy (EIS). The equivalent electrical circuits for fitting experimental results were similar to those for characterization of metal/polymer coating systems. Impedance data and voltammetric curves showed that an increase of local pH due to reduction process of nitrate ions induces the co-precipitations of metal ions in the proximity of electrode as oxides.

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Section: Voltammetric Characterization Of Doped Zno Electrodepositionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

EIS studies of electrodeposition process of manganese and copper doped ZnO wires

Enculescu

Sima

Vasile

et al. 2008

Surface & Interface Analysis

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“…Though a wide research has been done on doped nanostructured materials, there are few reports on doped ZnO nanostructures, particularly about their optical properties. The transition metal doped nanostructure is an effective method to adjust the energy levels and surface states of ZnO, which can further introduce changes in its physical and especially optical properties [12] . In addition to the UV excitonic emission peak, ZnO commonly exhibits the visible luminescence at different emission wavelengths due to the intrinsic or extrinsic defects [13] .…”

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confidence: 99%

Synthesis and optical properties of Ni-doped zinc oxide nanoparticles for optoelectronic applications

Elilarassi

Chandrasekaran

2010

Optoelectron. Lett.

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Nanocrystalline undoped and nickel doped zinc oxide (Zn 1-x Ni x O, x = 0.00, 0.01) powders are successfully synthesized by a simple and low-temperature "auto-combustion method". The microstructural and optical absorption and emission properties of the as-prepared samples are obtained using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infra-red spectrometer (FTIR), UV-visible and photoluminescence (PL). The structure study confirms the formation of the hexagonal wurtzite ZnO without any secondary phase in the Ni-doped sample. The optical absorption measurements indicate the red shift in the absorption band edge upon nickel doping. The band gap energy decreases from 3.21 eV to 3.17 eV. The photoluminescence spectra of the as-prepared samples under a room temperature show strong ultraviolet (UV) and blue emission peaks. The PL emission research strongly reveals that Ni doping can effectively adjust the energy level which leads to a red shift at the emission peak in UV region.Nanocrystalline materials have attracted extensive attention due to their unique properties and immense potential applications in nanodevice fabrications [1][2][3][4] . ZnO is a wide band gap (3.34 eV) semiconductor material with high-exciton binding energy (60 meV) and higher optical gain than GaN at a room temperature [5,6] . ZnO is one of the promising materials for low-voltage and short-wavelength optoelectronic applications such as UV devices, light-emitting diodes and laser diode [7][8][9] . Its other applications include transparent ultraviolet protection films, gas sensors and varistors [10,11] . Though a wide research has been done on doped nanostructured materials, there are few reports on doped ZnO nanostructures, particularly about their optical properties. The transition metal doped nanostructure is an effective method to adjust the energy levels and surface states of ZnO, which can further introduce changes in its physical and especially optical properties [12] . In addition to the UV excitonic emission peak, ZnO commonly exhibits the visible luminescence at different emission wavelengths due to the intrinsic or extrinsic defects [13] .However, it is still a great challenge to synthesize ZnO nanostructures doped with the transition metal element using a simple process with a low cost. The solution growth method is an effective approach and promising route for synthesizing ZnO nanomaterials at a low temperature. Therefore, the solution growth "auto-combustion method" is used to prepare undoped ZnO and Ni-doped nanomaterials at a low temperature in this paper. The high quality nanocrystalline powders of Zn 1-x Ni x O (x=0.00, 0.01) are successfully synthesized and their structural and optical absorption and emission properties are investigated. The present synthesis method is reproducible and ensures the large scale production at a low temperature.All chemicals used are of analytical grade purity. In a typical synthesis of Zn 1-x Ni x O (x=0.00,0.01) samples, according to the appropriate proportion,...

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“…For semiconductors, doping is a powerful tool to tailor the electrical and optical properties. The doping of transition metals (TM) offers feasible means of tuning physical properties, especially optical, electrical and magnetic properties to suit specific needs and applications [5]. The most commonly used metallic dopants are Cr- [6], Co- [7], Cu- [8], Mn- [9] doped ZnO systems.…”

Section: Introductionmentioning

confidence: 99%

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

Sangeetha

Muthukumaran²

2015

J Mater Sci: Mater Electron

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Zn 0.94 Cu 0.04 Cr 0.02 O nanocrystals were synthesized by co-precipitation method and the effects of annealing at 600°C and 800°C under two steps on the structural, optical and morphological properties were investigated systematically. X-ray diffraction pattern showed the secondary phases such as CuO and ZnCr 2 O 4 were found at 600 ? 800°C annealed sample. In addition, I (002) /I (100) ratio became almost equal to 1 at 600 ? 800°C which described the grains with lower surface energy became larger. Chemical composition of the samples was confirmed by energy dispersive X-ray spectra. The variation of absorption peaks between 473 and 556 cm -1 and the shift of absorption frequency towards the lower side by annealing revealed that Zn-O-Zn network is perturbed by the presence of Cu/Cr in its environment. Absorption intensity and blue shift of energy gap were discussed based on size, defects and secondary phase formation. The broad transmittance spectra noticed around visible region illustrated the presence of oxygen related defects and Cu/Cr interstitials. I green /I blue ratio is increased with increase in annealing temperature. The noticed high value of this ratio at 800°C confirmed the existence more defect related states.

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ZnO:Mn:Cu nanowires prepared by template method

Cited by 41 publications

References 14 publications

EIS studies of electrodeposition process of manganese and copper doped ZnO wires

EIS studies of electrodeposition process of manganese and copper doped ZnO wires

Synthesis and optical properties of Ni-doped zinc oxide nanoparticles for optoelectronic applications

Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals

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