The influence of vacuum and annealing on the visible luminescence in ZnO nanoparticles

Chithira, P.R.; John, Teny Theresa

doi:10.1016/j.jlumin.2017.01.022

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…Figure shows the ESR spectra of Fe-doped samples at room temperature. The undoped sample does not show any clear ESR signal . For the doped nanoparticles, a single Lorentzian broad ESR signal is seen.…”

Section: Results and Discussionmentioning

confidence: 84%

“…The undoped sample does not show any clear ESR signal. 10 For the doped nanoparticles, a single Lorentzian broad ESR signal is seen. For Fe1, the signal consists of a small kink at around g = 1.83 followed by a sharp increase in intensity corresponding to a g factor of 1.99.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…Fe-doped ZnO nanoparticles were synthesized by a chemical precipitation method. The details of the preparation method are described in our previously published work . To the aqueous solution of zinc acetate (Zn(CH 3 COO) 2 ), an appropriate amount of iron acetate (Fe(CH 3 COO) 2 ) is added with continuous stirring prior to the addition of sodium hydroxide (NaOH) to get the Fe-doped ZnO nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the preparation method are described in our previously published work. 10 EXAFS Analysis. EXAFS and X-ray absorption near edge (XANES) measurements were carried out at beamline 9, with an Indus-2 synchrotron source (2.5 GeV, 300 mA) at RRCAT-India.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles

et al. 2021

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A simple solution-based chemical precipitation method was used to synthesize the Fe-doped ZnO nanoparticles. X-ray Photoelectron Spectroscopy (XPS) measurement showed that mostly Fe2+ ions are incorporated in a lower percentage of Fe doping, while a higher percentage leads to Fe3+. The broad absorption band in the visible range shows the d–d crystal field transitions between the multiplets of 3d5 configuration of the high spin Fe3+ substituting Zn2+ under the influence of a tetrahedral ZnO crystal field. Raman measurement also supports the optical absorption data. ESR results show that the occurrence of broad signals is due to the exchange interactions among the TM ions in the doped samples. Fe exists in a mixed phase in Fe1 and the wide curve in Fe10 is due to the exchange interaction among Fe3+– Fe3+. EXAFS measurements confirm that the spectral features showing the peak edge position is similar to Fe2O3 corresponding to the Fe3+ state. From this, it can be inferred that Fe exists mostly in a +3 oxidation state in all the samples, but there may be existence of +2 states in the surface layers as observed from XPS measurement. Fe1 shows RTFM with a coercivity of ∼70 Oe. The non-saturating, linear magnetic moment at higher applied magnetic field is due to the paramagnetic contribution from the uncoupled Fe3+ ions.

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Section: Results and Discussionmentioning

confidence: 84%

Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles

et al. 2021

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“…When Li substitutes for zinc (Li Zn ), it assumes the role of an acceptor in the ZnO lattice. Consequently, Li Zn can effectively capture some of the free electrons, thus mitigating the overall increase in electron concentration stemming from oxygen vacancies (V O ) [31,32]. This introduces a competitive This improvement could be attributed to several factors, including the reduction in the number of scattering centers within the lattice, and enhancements in crystallinity or grain boundary structure [30,33].…”

Section: 대한금속 • 재료학회지 제62권 제2호 (2024년 2월)mentioning

confidence: 99%

Modulating the Electrical Properties of Lithium-Doped Zinc Oxide: Interplay of Lithium Content, Oxygen Pressure, and Temperature

Park

2024

Korean J. Met. Mater.

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This research elucidates the intricate interplay of lithium content, oxygen pressure, and temperature and their influence on the electrical properties of Lithium-doped zinc oxide (LZO). The electrical behavior of zinc oxide (ZnO), a prominent semiconductor material, can be modulated when doped with lithium (Li). Through systematic experimentation, we demonstrate that varying lithium content in the ZnO matrix leads to notable shifts in carrier concentration and mobility, which in turn impacts the material's conductivity and overall electrical performance. Furthermore, oxygen pressure during synthesis plays a pivotal role in defect formation, especially oxygen vacancies, which interact dynamically with lithium dopants to further modulate electrical behavior. Introducing the variable of temperature, our study reveals a synergistic effect, where temperature not only affects intrinsic carrier concentration but also the interactions between lithium dopants and inherent defects in ZnO. Under optimized conditions of oxygen pressure and temperature, the influence of Li content on crystallinity was pronounced, consequently impacting mobility. In contrast, under unoptimized conditions, as Li concentration increased, particularly beyond optimal levels (0.75 mol%), introduced Li atoms assumed the role of compensating centers by capturing or neutralizing carriers, reducing mobility. The findings presented herein provide a comprehensive understanding of how these factors collectively determine the electrical properties of LZO, paving the way for tailored applications in optoelectronic devices, sensors, and more.

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Structural, optical, and magnetic properties of low temperature hydrothermal synthesized (Gd, Al)-codoped ZnO nanoparticles

Wang

Cui

Zhu

et al. 2019

J Sol-Gel Sci Technol

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The influence of vacuum and annealing on the visible luminescence in ZnO nanoparticles

Cited by 16 publications

References 31 publications

Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles

Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles

Modulating the Electrical Properties of Lithium-Doped Zinc Oxide: Interplay of Lithium Content, Oxygen Pressure, and Temperature

Structural, optical, and magnetic properties of low temperature hydrothermal synthesized (Gd, Al)-codoped ZnO nanoparticles

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The influence of vacuum and annealing on the visible luminescence in ZnO nanoparticles

Cited by 16 publications

References 31 publications

Local Structural Studies Through EXAFS and Effect of Fe2+or Fe3+ Existence in ZnO Nanoparticles

Local Structural Studies Through EXAFS and Effect of Fe2+or Fe3+ Existence in ZnO Nanoparticles

Modulating the Electrical Properties of Lithium-Doped Zinc Oxide: Interplay of Lithium Content, Oxygen Pressure, and Temperature

Structural, optical, and magnetic properties of low temperature hydrothermal synthesized (Gd, Al)-codoped ZnO nanoparticles

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Product

Resources

About

Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles

Local Structural Studies Through EXAFS and Effect of Fe²⁺or Fe³⁺ Existence in ZnO Nanoparticles