Electrical and Optical Properties of Bulk ZnO Single Crystal Grown by Flux Bridgman Method

Li, Xinhua; Xu, Jing; Jin, Min; Shen, Hui; Li, Xiaomin

doi:10.1088/0256-307x/23/12/065

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…The sharp absorption peak observed at 364 nm confirms the formation of ZnO NPs by the autocombustion method. There was a significant blueshift in the excitonic absorption of the prepared biogenic ZnO NPs (364 nm) compared to that of the bulk ZnO (373 nm) [22,23]. In addition, there was no other peak observed in the spectrum except for the characteristic peak, which indicates that ZnO NPs prepared using Coriandrum sativum possess high purity.…”

Section: Uv-vis Analysismentioning

confidence: 89%

Biogenic ZnO nanoparticles: a study of blueshift of optical band gap and photocatalytic degradation of reactive yellow 186 dye under direct sunlight

Singh

Kaur

et al. 2019

Green Processing and Synthesis

112

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Synthesis of nanoparticles (NPs) using plant extracts has been suggested as an environmentally friendly alternative to chemical synthesis of semiconductor NPs. In the present study, ZnO NPs were synthesized by a simple and cost-effective method using Coriandrum sativum leaf extract and zinc acetate as precursors. The as-synthesized ZnO NPs were characterized by UV-visible spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) analysis. The results confirmed the formation of ZnO NPs with a wurtzite structure, spherical shape and average particle size of 24 nm. The photocatalytic degradation of reactive yellow 186 (RY 186) dye was carried out under direct sunlight irradiation and its degradation efficiency and apparent rate constant (K’app) of reaction were calculated to be 93.38%, and 0.0019 min−1, respectively. The optical band gap value of the as-synthesized ZnO NPs was found to be 3.4 eV, which indicates the presence of blueshift. Owing to the presence of blueshift and a wide band gap of synthesized biogenic ZnO NPs, the overall absorption of sunlight irradiation will be enhanced, which leads to higher degradation efficiency of the dye. The current study thus highlights the optical band gap properties of biogenic ZnO NPs and their significance as a heterogeneous catalyst for the purification of polluted water.

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Section: Uv-vis Analysismentioning

confidence: 89%

Biogenic ZnO nanoparticles: a study of blueshift of optical band gap and photocatalytic degradation of reactive yellow 186 dye under direct sunlight

Singh

Kaur

et al. 2019

Green Processing and Synthesis

112

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“…17 It is essential in this case that such a result is achieved for a ceramic in which the predominant orientation of the grains is not optimal for a hexagonal structure, since it does not coincide with the direction of the optic axis. Figure 3a shows the x-ray-luminescence spectra of ZnO I and ZnO II ceramics in comparison with the spectrum of the traditional scintillator BaF 2 .…”

Section: Optical and X-ray Characteristics Of The Samplesmentioning

confidence: 99%

“…It should be pointed out that the resulting transparency level of the undoped ceramic in the long-wavelength region ͑ജ600 nm͒ approaches that for single-crystal ZnO. 17 It is essential in this case that such a result is achieved for a ceramic in which the predominant orientation of the grains is not optimal for a hexagonal structure, since it does not coincide with the direction of the optic axis.…”

Section: Optical and X-ray Characteristics Of The Samplesmentioning

confidence: 99%

Optical, luminescence, and scintillation properties of ZnO and ZnO:Ga ceramics

et al. 2008

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Uniaxial hot pressing has been used to obtain ceramics based on zinc oxide, and their optical, x-ray-structure, luminescence, and scintillation characteristics have been studied. It is shown that, by changing the concentration of the dopant ͑Ga͒ and the codopant ͑N͒, it is possible to change the intensities of the edge band ͑397.5 nm͒ and the intraband luminescence ͑510 nm͒ of the ZnO luminescence, as well as their ratio. Undoped ZnO ceramic has good transparency in the visible region and fairly high luminous yield: 9050 photons per MeV. Ceramic ZnO: Ga possesses intense edge luminescence with a falloff time of about 1 ns.

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“…Scintillation light yield of ZnO was set to 9000 photon/MeV [23]. Also, X-ray induced luminescence spectrum and optical absorption/scattering coefficients of ZnO were similar to what previously reported in [24,25]. The parameters required for modeling light transport in the polycarbonate included its refractive index, optical scattering length and absorption length [26][27][28].…”

Section: Input Optical Parametersmentioning

confidence: 99%

Fabrication, testing and simulation of a high spatial resolution alpha-particle imager based on ZnO nanowires in a polycarbonate nanoporous membrane

et al. 2013

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A new architecture consisting of ZnO nanowires embedded in a polycarbonate nanoporous membrane was proposed, fabricated and simulated as a high spatial resolution alpha particle imager. The experimental and Geant4 simulation results showed that ZnO nanowires could act as scintillating fibers to prevent spread of the generated optical photons inside the imager. This property can be used to precisely determine alpha collision coordinates. An array of these nanowires can be also applied as a new high spatial resolution alpha particle imager.

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Electrical and Optical Properties of Bulk ZnO Single Crystal Grown by Flux Bridgman Method

Cited by 21 publications

References 16 publications

Biogenic ZnO nanoparticles: a study of blueshift of optical band gap and photocatalytic degradation of reactive yellow 186 dye under direct sunlight

Biogenic ZnO nanoparticles: a study of blueshift of optical band gap and photocatalytic degradation of reactive yellow 186 dye under direct sunlight

Optical, luminescence, and scintillation properties of ZnO and ZnO:Ga ceramics

Fabrication, testing and simulation of a high spatial resolution alpha-particle imager based on ZnO nanowires in a polycarbonate nanoporous membrane

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