Correlation among oxygen vacancy and doping concentration in controlling the properties of cobalt doped ZnO nanoparticles

Chithira, P.R.; John, Teny Theresa

doi:10.1016/j.jmmm.2019.165928

Cited by 73 publications

(26 citation statements)

References 75 publications

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“…The chemical structure of the Co-ZnO composites was also studied by the Fourier transform infrared (FTIR) method. In Figure S12 , for pristine ZnO, the FTIR bands at 1438, 1649, and 3450 cm −1 belong to -OH deforming, O-H stretching, and -OH stretching, respectively [ 45 ]. After Co-doping, the FTIR bands regarding ZnO vibrations shift to a low wavenumber because of a partial electron transfer between ZnO and Co [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

Au Nanoparticles (NPs) Decorated Co Doped ZnO Semiconductor (Co400-ZnO/Au) Nanocomposites for Novel SERS Substrates

Zhai

Zhao

et al. 2022

Biosensors

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Au nanoparticles were decorated on the surface of Co-doped ZnO with a certain ratio of Co2+/Co3+ to obtain a novel semiconductor-metal composite. The optimal substrate, designated as Co400-ZnO/Au, is beneficial to the promotion of separation efficiency of electron and hole in a semiconductor excited under visible laser exposure, which the enhances localized surface plasmon resonance (LSPR) of the Au nanoparticles. As an interesting finding, during Co doping, quantum dots of ZnO are generated, which strengthen the strong semiconductor metal interaction (SSSMI) effect. Eventually, the synergistic effect effectively advances the surface enhancement Raman scattering (SERS) performance of Co400-ZnO/Au composite. The enhancement mechanism is addressed in-depth by morphologic characterization, UV-visible, X-ray diffraction, photoluminescence, X-ray photoelectron spectroscopy, density functional theory, and finite difference time domain (FDTD) simulations. By using Co400-ZnO/Au, SERS detection of Rhodamine 6G presents a limit of detection (LOD) of 1 × 10−9 M. As a real application, the Co400-ZnO/Au-based SERS method is utilized to inspect tyramine in beer and the detectable concentration of 1 × 10−8 M is achieved. In this work, the doping strategy is expected to realize a quantum effect, triggering a SSSMI effect for developing promising SERS substrates in future.

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Section: Resultsmentioning

confidence: 99%

Au Nanoparticles (NPs) Decorated Co Doped ZnO Semiconductor (Co400-ZnO/Au) Nanocomposites for Novel SERS Substrates

Zhai

Zhao

et al. 2022

Biosensors

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“…[32] Compared to the single ZnO, a considerable intensity reduction for 20 % TNCs is also reported to be due to the change in the crystalline quality as a result of doping. [23] Besides, the TNCs also showed a greater intensity reduction compared to the BNCs, indicating the effect on the ternary is due to the combined effects of copper and cobalt dopants. Of course, this intensity reduction for TNCs shows the presence of ChemistrySelect great electron-hole recombination reduction properties, which have great effects on the mass production of an oxidizing agent such as the hydroxyl radical.…”

Section: Chemistryselectmentioning

confidence: 95%

“…[31] The ionic radius of both cobalt ions (Co + 2 , 0.072 nm) and copper ions (Cu + 2 , 0.073 nm) is closer to that of the zinc ions (Zn + 2 , 0.074 nm), which may not have a visible effect on the geometry of the ZnO host during inclusion. [13,26,27] Recent work also reported [23] the properties of cobalt substitution in the ZnO lattice up to 10 % without inducing additional cobalt metal or cobalt oxide crystal. The absence of an independent crystal for cobalt up to 10 % is due to the similar ionic radii between cobalt and zinc and the greater solubility level of cobalt.…”

Section: Chemistryselectmentioning

confidence: 99%

“…The additional absorption band in the visible region for TNCs confirms doping level creation below the ZnO conduction band. [23] These additional bands and doping level creation assist a shallow level d-d electron transition, which hinders the photon-induced electron-hole recombination. [34] The direct and indirect band gaps of the materials were determined from the Kubelka-Munk relation by extrapolation of the linear region towards the xaxis, as shown in Figure 4b and 4c.…”

Section: Chemistryselectmentioning

confidence: 99%

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Synergistically Augmented ZnO via Cobalt and Copper Simultaneous Doping for Pollutant Reduction

et al. 2023

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Continuous electron‐hole transfer and the ability of nanoscale materials to absorb visible light are critical for pollutant catalytic reduction. Cobalt and copper co‐doped ZnO composites were shaped by the sol‐gel solution combustion (SG‐SC) approach. The x‐ray diffraction analysis confirmed the crystalline nature and interstitial doping of copper and cobalt in the zinc oxide lattice and the development of ZnO‐CuO local contact. The PL and DRS‐UV‐vis investigations showed the NCs’ superior charge transfer and considerable redshift (from 3.17 to 2.21 eV) properties over ZnO. TEM and SEM‐EDS analyses confirmed the foam‐type surface morphology, elemental composition, and dopant distribution. The NCs showed greater potency than ZnO NPs in the catalytic reduction reactions of 4‐nitrophenol and methylene blue. Thus, the SG‐SC approach has the potential for industrially scalable catalytic pollutant reduction applications.

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“…In the past decades, several research groups have done interesting research to work widely on the unique arrangement of transition metal (TM) ion-doped ZnO nanoparticles with magnetic and optical properties [10,11]. The TM oxide-doped ZnO holds place in various applications including sensors [12], solar cell [13], optoelectronics [14], spintronics [15], and piezoelectric devices [16]. The analysis of the variations in the properties arising due to doping of different transition metals such as Cu, Ni, Co, Mn, Cr, and Fe to ZnO has always been the matter of controversial studies [17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Optical and Antibacterial Activity of Hydrothermally Synthesized Cobalt-Doped Zinc Oxide Cylindrical Microcrystals

et al. 2021

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Cobalt (Co) doped zinc oxide (ZnO) microcrystals (MCs) are prepared by using the hydrothermal method from the precursor’s mixture of zinc chloride (ZnCl2), cobalt-II chloride hexahydrate (CoCl2·6H2O), and potassium hydroxide (KOH). The smooth round cylindrical morphologies of the synthesized microcrystals of Co-doped ZnO show an increase in absorption with the cobalt doping. The antibacterial activity of the as-obtained Co-doped ZnO-MCs was tested against the bacterial strains of gram-negative (Escherichia coli, Klebsiella pneumonia) and gram-positive bacteria (Staphylococcus aureus, Streptococcus pyogenes) via the agar well diffusion method. The zones of inhibition (ZOI) for Co-doped ZnO-MCs against E. coli and K. pneumoniae were found to be 17 and 19 mm, and 15 and 16 mm against S. Aureus and S. pyogenes, respectively. The prepared Co-doped ZnO-MCs were thus established as a probable antibacterial agent against gram-negative bacterial strains.

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Correlation among oxygen vacancy and doping concentration in controlling the properties of cobalt doped ZnO nanoparticles

Cited by 73 publications

References 75 publications

Au Nanoparticles (NPs) Decorated Co Doped ZnO Semiconductor (Co400-ZnO/Au) Nanocomposites for Novel SERS Substrates

Au Nanoparticles (NPs) Decorated Co Doped ZnO Semiconductor (Co400-ZnO/Au) Nanocomposites for Novel SERS Substrates

Synergistically Augmented ZnO via Cobalt and Copper Simultaneous Doping for Pollutant Reduction

Enhanced Optical and Antibacterial Activity of Hydrothermally Synthesized Cobalt-Doped Zinc Oxide Cylindrical Microcrystals

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