Optical and electrical properties of p-type Ag-doped ZnO nanostructures

Khosravi, Sara; Yousefi, Ramin; Jamali‐Sheini, Farid; Huang, Nay Ming

doi:10.1016/j.ceramint.2013.12.145

Cited by 150 publications

(53 citation statements)

References 25 publications

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“…Silver is a promising metal for ZnO doping, as studied earlier and confirmed in our calculations. Although the position of the ϵ HOIL level is rather unfavourable at ∼6 % defect concentration, it moves downwards with growing d NW and also with decreasing Ag content.…”

Section: Predictions On Photocatalytic Efficiency Of Doped Zinc Oxidesupporting

confidence: 87%

“…Alternatively, Ag‐doped ZnO nanostructures were also investigated as potential photocatalysts . M. Hsu and C. Chang studied photocatalysts fabricated of Ag‐doped ZnO nanorods grown on stainless‐steel wire meshes .…”

Section: Progress In Contemporary Researches Of Doped Zno Applicabilimentioning

confidence: 99%

“…Khosravi‐Gandomani et al . studied Ag‐doped ZnO nanoparticles synthesized by a sol‐gel method . Both pristine and Ag‐doped ZnO are crystallized in a wurtzite phase.…”

Section: Progress In Contemporary Researches Of Doped Zno Applicabilimentioning

confidence: 99%

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Doped 1D Nanostructures of Transition‐metal Oxides: First‐principles Evaluation of Photocatalytic Suitability

Zhukovskii

Piskunov

Lisovski

et al. 2016

Israel Journal of Chemistry

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The splitting of water molecules under the influence of solar light on semiconducting electrodes is a clean and renewable source for the production of hydrogen fuel. Its efficiency depends on the relative position of the band‐gap edges or the induced defect levels with a proper band alignment relative to the redox H+/H2 and O2/H2O potentials. For example, TiO2 and ZnO bulk, as well as thick slabs (whose band gaps are ∼3.2–3.4 eV), can be active only for photocatalytic applications under UV irradiation (possessing ∼1 % solar energy conversion efficiency). Nevertheless, by adjusting the band gap through formation of nanostructures and further doping, the efficiency can be increased up to ∼15 % (for 2.0–2.2 eV band gap). We analyse results of DFT (density functional theory) calculations on TiO2 nanotubes and ZnO nanowires, both pristine and doped (e.g., by AgZn, CO, FeTi, NO and SO substitutes). To reproduce the energies of one‐electron states better, we have incorporated the Hartree‐Fock (HF) exchange into the hybrid DFT+HF Hamiltonian. Both the atomic and electronic structure of nanomaterials, simulated by us, are analysed to evaluate their photocatalytic suitability, including positions of the redox potential levels inside the modified band gap, the width of which corresponds to visible‐light energies. Analysis of the densities of states (DOS) for considered nanostructures clearly shows that photocatalytic properties can be significantly altered by dopants. The chosen hybrid methods of first‐principles calculations significantly simplify selection of suitable nanomaterials possessing the required photocatalytic properties under solar light irradiation.

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Section: Predictions On Photocatalytic Efficiency Of Doped Zinc Oxidesupporting

confidence: 87%

Section: Progress In Contemporary Researches Of Doped Zno Applicabilimentioning

confidence: 99%

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Doped 1D Nanostructures of Transition‐metal Oxides: First‐principles Evaluation of Photocatalytic Suitability

Zhukovskii

Piskunov

Lisovski

et al. 2016

Israel Journal of Chemistry

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“…The Ag(3d 3/2 ) and Ag(3d 5/2 ) peaks were split to about the ∼6eV that showed the metallic condition of silver in the present synthesised samples 38,39 . Lupan et al 11 and Khosravi et al 40 have revealed the presence of two different components, which could be attributed to either metallic Ag or Ag 2 O and to a Ag-Zn-O ternary compound. Interestingly, the binding energy of Ag-3d for the doped sample compared to the binding energy of silver bulk sample (368.3 eV for Ag(3d 5/2 ) and 374.3 eV for Ag(3d 3/2 ) 41 ) was significantly shifted towards lower binding energy.…”

Section: Xps Resultsmentioning

confidence: 99%

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Hosseini

Sarsari

Kameli

et al. 2015

Journal of Alloys and Compounds

271

126

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Silver-doped ZnO nanoparticles were successfully fabricated at 400• C via a simple and rapid method based on short time solid state milling and calcination of precursor powders. The effect of Ag dilute doping on the structural, optical, and photocatalytic properties of ZnO nanoparticles was investigated by X-ray diffraction (XRD), UV-vis spectrophotometer and photoluminescence (PL) spectroscopy. X-ray analysis revealed that Ag doped ZnO solidified in hexagonal wurtzite structure. The intensity of deep level emission was reduced with increasing silver doping in PL measurement. The X-ray photoelectron spectroscopy (XPS) measurement predicted that Ag was mainly in the metallic state and ZnO was in the wurtzite structure. This metallic state accompanied by unique zinc oxide properties decolorized the methyl violet, efficiently. The first-principles calculation represented Ag deep level in ZnO with an n-type behavior, while in ZnO structure with grain boundary p-type nature via shallow states is dominant same as powder samples as studied in this present work. It was suggested that these Ag-doped ZnO nanoparticles may have good applications in optoelectronics, spintronics and wastewater treatment.

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“…The Bragg reflections at 2θ = 38.17, and 44.38, can be indexed to the (1 1 1) and (2 0 0), orientations, respectively, confirmed the presence of AgNPs. These results clearly indicated that the AgNPs were composed of highly crystalline nano structures [18]. The mean size of silver nanoparticles was calculated using the Debye-Scherer's equation by determining the width of the (111) Braggs reflection.…”

Section: X-ray Analysismentioning

confidence: 99%

Bio Synthesis and Characterization of Silver Nanoparticles Using <i>Lagenaria siceraria</i> Leaf Extract and their Antibacterial Activity

Anandh¹,

Muthuvel²,

Emayavaramban³

2014

ILCPA

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The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the Lagenaria siceraria leaf extract. The synthesized AgNPs have characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques. AgNPs formation has screened by UV-visible spectroscopy through colour conversion due to surface plasma resonance band at 427 nm. X-ray diffraction (XRD) confirmed that the resulting AgNPs are highly crystalline and the structure is face centered cubic (fcc). FT-IR spectrum indicates the presence of different functional groups present in the biomolecules capping the nanoparticles. Further, inhibitory activity of AgNPs and leaf extract were tested against human pathogens like gram-pastive (Staphylococcus aureus, Bacillus subtilis), gram-negative (Escherichia coli and Pseudomonas aeruginosa). The results indicated that the AgNPs showed moderate inhibitory actions against human pathogens than Lagenaria siceraria leaf extract, demonstrating its antimicrobial value against pathogenic diseases.

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Optical and electrical properties of p-type Ag-doped ZnO nanostructures

Cited by 150 publications

References 25 publications

Doped 1D Nanostructures of Transition‐metal Oxides: First‐principles Evaluation of Photocatalytic Suitability

Doped 1D Nanostructures of Transition‐metal Oxides: First‐principles Evaluation of Photocatalytic Suitability

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Bio Synthesis and Characterization of Silver Nanoparticles Using <i>Lagenaria siceraria</i> Leaf Extract and their Antibacterial Activity

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