Structural, bandgap tuning and electrical properties of Cu doped ZnO nanoparticles synthesized by mechanical alloying

Das, Bikram Keshari; Das, T. K.; Parashar, Kajal; Thirumurugan, Arun; Parashar, S. K. S.

doi:10.1007/s10854-017-7388-2

Cited by 37 publications

(15 citation statements)

References 24 publications

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“…Meanwhile, ε′, ε′ and tan δ values decreased exponentially with the increase of frequency, while σ ac increased along with the increase of frequency. Consequently, the Sm doped ZnO samples are potential candidates to be used in high frequency devices and dielectric applications [71,72]. The values of ε′ and σ ac decreased as the Sm doping content increased at all temperatures, where they attained the highest values at 773 K.…”

Section: Resultsmentioning

confidence: 99%

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Badreddine

Srour

Awad

et al. 2020

Mater. Res. Express

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Zn1−xSmxO nanoparticles, with 0.00 ≤ x ≤ 0.10, were prepared using chemical co-precipitation method. The structure and morphology of the obtained samples were characterized using x-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. However, the mechanical properties were investigated via digital Vickers microhardness tester. Vickers microhardness measurements were carried out at different applied loads, varying between 0.5 and 10 N at dwell time 60 s on pressed discs of average thickness 3 mm. Hv decreased as the Sm-content increased up to 0.02 and then it increased for higher concentrations. Whereas, it increased as the applied load increased, revealing that the samples exhibited a reverse indentation size effect (ISE). The microhardness measurements were interpreted using various models such as Meyer’s law, Hays and Kendall (HK) approach, elastic/plastic deformation (EPD), proportional specimen resistance (PSR) and the indentation-induced cracking (IIC). Mechanical parameters such as Young’s modulus (E), yield strength (Y), fracture toughness (K) and brittleness index (B) were calculated as a function of x. The most adequate model for the true microhardness of these samples is IIC. It was found that the addition of Sm content enhanced the mechanical properties of the prepared samples after x = 0.02. Dielectric measurements were used to compute different parameters such as real and imaginary parts of the complex permittivity, dielectric loss (tan δ) and ac conductivity (σ ac).

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Section: Resultsmentioning

confidence: 99%

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Badreddine

Srour

Awad

et al. 2020

Mater. Res. Express

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“…A decrease in peak intensity and peak broadening observed due to ball milling which indicates the reduction in size of the sample. This expansion of peak con rmed the decrease in size and the improvement of strain in the prepared samples.It is clear from the XRD pattern of 10h milled sample that there is no secondary peak related to CuO or Cu related secondary and impurity phase which con rms the purity as well as formation of single phase of the sample [26][27][28] The peak shifting for different duration of milling was observed from (Figure 3) shows the shifting towards the lower 2θ angle.This may be due to various kinds of strain arises in the synthesized samples due to milling and also due to introduction of Cu into ZnO lattice.…”

Section: Methodsmentioning

confidence: 85%

“…The peak shows that crystal structure of Zn 1-x Cu x O nano powders are similar to JCPDS data card No. 36-1451 [21][22][23][24][25][26]. A decrease in peak intensity and peak broadening observed due to ball milling which indicates the reduction in size of the sample.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Das

Parashar

et al. 2020

Preprint

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In this work, high energy ball milling (HEBM) technique has been employed to successfully synthesize a series of Cu-doped ZnO nanoceramics (Zn 1-x Cu x O) with Cu concentration x = 0, 0.01, 0.02, 0.03 and 0.04. The synthesized nanoceramic was analysed by XRD, FESEM, TEM, Uv-Vis-DRS. The structural, microstructural and optical properties of the synthesized sample with different duration of milling, doping concentration and temperature has been investigated. X-ray diffraction result indicates that the samples are wurtzite structure with single phase. A decrease in peak intensity was observed with increase in milling time. 10h milled Cu doped ZnO sample shows single phase. After calcination at 900 ºC in x = 0.04 few peaks related to CuO was observed indicating the solubility limit of Cu in ZnO is 3 atomic%. With increase in milling time crystallite decreases where as strain increases however after calcination crystallite increases where as strain decreases. After calcination peak intensity increases. The specific surface area of ZnO increases after Cu doping but decreases after calcination. Bond length decreases after calcination but lattice distortion increases. FESEM micrograph shows particle growth after calcination. The average particle size decreases with increase in Cu concentration(30 nm to 20 nm) whereas increases after calcination and sintering (488 nm-2706 nm).The band gap decreases with increasing in milling time also with increase in Cu concentration and after calcination. Cu doping in ZnO shows red shift indicating Cu doped ZnO samples are suitable for optoelectronic device applications.

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“…Many authors have been reported a reduction in the band gap energy with increase the Co‐doped concentration in ZnO prepared by different methods as a nanopowder or thin film . Moreover, Das et.al found also a reduction in energy gap of ZnO upon Cu introduced into ZnO matrix. Furthermore, the energy gap of Zn 1‐x Cu x O (x = 0%‐6% wt) nano particles produced by co‐precipitation method first decreased, then increased by increase the amount of Cu doped .…”

Section: Resultsmentioning

confidence: 99%

Structural and optical properties of doped ZnO/SiO₂ nanocomposite

Mohamed

Abdel-Kader

Alhazime

2019

Int J Applied Ceramic Tech

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The synthesis of ZnO/SiO2 nanocomposite doped with Co, Cu and Mn nanoparticles were performed using sol‐gel method. Rietveld refinement analysis was done for the X‐ray diffraction data and results showed that all samples are single wurtzite hexagonal phase and have an average crystallite size ~14 nm. The lattice parameters, bond length, crystallite size, microstrain, dislocation density and the system volume were studied in details. Transmission electron microscopy technique showed that nanoparticles characterized by an elliptical shape. Fourier transform infrared and scanning electron microscope techniques proved the presence of SiO2 in the system. The energy gap values of both undoped and doped samples with Co, Mn and Cu were 2.84, 2.47, 2.71 and 2.8 eV, respectively. Photoluminescence spectra for undoped and doped ZnO/SiO2 were investigated in details.

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Structural, bandgap tuning and electrical properties of Cu doped ZnO nanoparticles synthesized by mechanical alloying

Cited by 37 publications

References 24 publications

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Structural and optical properties of doped ZnO/SiO₂ nanocomposite

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Structural, bandgap tuning and electrical properties of Cu doped ZnO nanoparticles synthesized by mechanical alloying

Cited by 37 publications

References 24 publications

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Structural and optical properties of doped ZnO/SiO2 nanocomposite

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Structural and optical properties of doped ZnO/SiO₂ nanocomposite