Blue shift of optical band gap in Er-doped ZnO thin films deposited by direct current reactive magnetron sputtering technique

Chen, Y.; Xu, Xiao Li; Zhang, G.H.; Xue, H. Q.; Ma, Shenglin

doi:10.1016/j.physe.2010.01.029

Cited by 44 publications

(12 citation statements)

References 20 publications

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“…The low binding energy peak is assigned to lattice oxygen O 2− from the Zn-O, Cu-O and Fe-O linkages [28,29]. It is much stronger than the other two binding energy peaks, indicating that the majority of oxygen occurs as lattice oxygen O 2− in the ZnO/CuO/ZnFe 2 O 4 nanocomposite [33]. The middle binding energy peak is associated with O 2− in the oxygen-deficient regions, indicative of the presence of oxygen vacancies in the ZnO/CuO/ZnFe 2 O 4 nanocomposite [29].…”

Section: Characterizationmentioning

confidence: 96%

“…The middle binding energy peak is associated with O 2− in the oxygen-deficient regions, indicative of the presence of oxygen vacancies in the ZnO/CuO/ZnFe 2 O 4 nanocomposite [29]. The high binding energy peak is attributed to the absorbed oxygen species such as O 2 , H 2 O and CO 2 [33]; this peak is weaker than the other two binding energy peaks due to the high crystallinity of the ZnO/CuO/ZnFe 2 O 4 nanocomposite.…”

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Chen

Liu

2018

Catalysts

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Deriving photocatalysts by the calcination of hydrotalcite-like compounds has attracted growing interest for extending their photocatalytic activity to the visible and even near-infrared (NIR) light regions. Herein, we describe the acquisition of a ZnO/CuO/ZnFe2O4 nanocomposite with good photoFenton-like catalytic activity under UV, visible and near-infrared (NIR) light irradiation by optimizing the calcination temperature of the coprecipitation product of Zn2+, Cu2+ and Fe3+. The ZnO/CuO/ZnFe2O4 nanocomposite is composed of symbiotic crystals of ZnO, CuO and ZnFe2O4, which enable the nanocomposite to show absorption in the UV, visible and NIR light regions and to produce a transient photocurrent in the presence of H2O2 under NIR irradiation. The full-spectrum photoFenton-like catalyst shows improved performance for the degradation of methyl orange with an increasing amount of H2O2 and is very stable in the recycling process. We believe that the ZnO/CuO/ZnFe2O4 nanocomposite is a promising full-spectrum photoFenton-like catalyst for the degradation of organic pollutants.

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Section: Characterizationmentioning

confidence: 96%

Section: Characterizationmentioning

confidence: 99%

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Chen

Liu

2018

Catalysts

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“…1,2 However, the special intra-4f shell structure of Er atoms imposes restrictions on the PL at 1.54µm, which is exactly the problem researchers spend so much effort on solving. After a lot of attempts, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] it's empirically known that a crystal field made by oxygen surrounding Er makes the intra-4f transition possible and even efficient; besides, choosing semiconductors with wide band gap could also enhance the PL. Taking the two factors above into account, the material zinc oxide (ZnO) incontrovertibly becomes a good choice.…”

Section: Introductionmentioning

confidence: 99%

“…We find that even temperatures below 600 • C also have great influence on ZnO film quality and PL characterizations in Er-doped ZnO film. In the past years, researchers have studied a lot about Er ions' PL (1.54µm) in ZnO thin films grown on Si substrate or quartz, [7][8][9][10][11][12][13][14][15][16][17][18] especially the enhancement of PL in films with Si-NC. [7][8][9][10][11]18 Most found Si-NC with specific size improved the efficiency of Er ions' PL (1.54µm).…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of silicon (Si) on Er3+ 1.54μm excitation in ZnO thin films

et al. 2016

AIP Advances

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We have investigated the photoluminescence (PL) characteristics of ZnO:Er thin films on Si (100) single crystal and SiO2-on-silicon (SiO2) substrates, synthesized by radio frequency magnetron sputtering. Rutherford backscattering/channeling spectrometry (RBS), X-ray diffraction (XRD) and atomic force microscope (AFM) were used to analyze the properties of thin films. The diffusion depth profiles of Si were determined by second ion mass spectrometry (SIMS). Infrared spectra were obtained from the spectrometer and related instruments. Compared with the results at room temperature (RT), PL (1.54μm) intensity increased when samples were annealed at 250°C and decreased when at 550°C. A new peak at 1.15μm from silicon (Si) appeared in 550°C samples. The Si dopants in ZnO film, either through the diffusion of Si from the substrate or ambient, directly absorbed the energy of pumping light and resulted in the suppression of Er3+ 1.54μm excitation. Furthermore, the energy transmission efficiency between Si and Er3+ was very low when compared with silicon nanocrystal (Si-NC). Both made the PL (1.54μm) intensity decrease. All the data in experiments proved the negative effects of Si dopants on PL at 1.54μm. And further research is going on.

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“…The Er 3+ -doped semiconductors are the potential optoelectronic materials [7] due to the Er intra-4f shell transition with a photoemission at a wavelength of 1.54μm, which lies in the minimum loss region of silica-based optical fibers [8]. Up to now, physical doping methods such as ion implantation [9], laser ablation [10], magnetron sputtering [11], and high temperature calcinations [12] have mainly been used to introduce Er into ZnO substrate.Here, a laser ablation in ethanol has been used to prepare undoped and Er 3+ -doped ZnO. The structural and optical properties of the undoped and Er 3+ -doped ZnO was investigated.…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of Undoped and Er<sup>3+</sup>-Doped ZnO Nanoparticles Synthesized by Laser Ablation in Ethanol

Habubi

Ismail²,

Hadi

2016

ILCPA

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ABSTRACT. In this paper, we report on the fabrication and properties of undoped and 8.4% Er 3+ -doped ZnO nanoparticles synthesized by laser ablation in ethanol at laser fluence values 2.92 J/cm 2 . The synthesized nanoparticles are characterized by structural properties using X-ray diffractrometer, scanning electron microscope and the optical properties are carried out through UV-Visible spectrophotometer. The X-ray diffractrometer pattern indicates that these nanoparticle were polycrystalline in nature with a hexagonal (wurtzite) phase. SEM reveals that The synthesized ZnO and Er-ZnO NPs have a spherical shape. Moreover, the optical band gaps calculated through UV spectroscopy are found to be decreased with doping from 3.3 to 3.2 eV .

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Blue shift of optical band gap in Er-doped ZnO thin films deposited by direct current reactive magnetron sputtering technique

Cited by 44 publications

References 20 publications

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Suppression effect of silicon (Si) on Er3+ 1.54μm excitation in ZnO thin films

Structural and Optical Properties of Undoped and Er<sup>3+</sup>-Doped ZnO Nanoparticles Synthesized by Laser Ablation in Ethanol

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