A novel green-emitting Ni2+-doped Ca-Li hydroxyapatite nanopowders: structural, optical, and photoluminescence properties

Reddy, Ch. Venkata; Koutavarapu, Ravindranadh; Ravikumar, R.V.S.S.N.; Shim, Jaesool

doi:10.1007/s10854-020-03070-x

Cited by 9 publications

(4 citation statements)

References 45 publications

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“…X-ray photoelectron spectroscopy (XPS) characterized the prepared NiO nanoflowers’ composition. Figure 1 b represents two characteristic peaks of Ni2p at 854.59 and 856.78 eV, which correspond to 2p 3/2 Ni 2+ and Ni 3+ peaks, respectively [ 24 , 25 , 26 , 27 ]. Additionally, the corresponding satellite peak of the 2p 3/2 was observed at a binding energy of 861.23 eV [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

et al. 2023

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A modified electrode with conducting polymer (Polyaniline) and NiO nanoflowers was prepared to detect nitrite ions in drinking water. A simple method was used to prepare the NiO nanoflower (NiOnF). Several techniques characterized the as-prepared NiOnF to determine the chemical structure and surface morphology of the NiO, such as XRD, XPS, FT-IR, and TGA. The activity of the electrode toward nitrite sensing was investigated over a wide range of pH (i.e., 2 to 10). The amperometry method was used to determine the linear detection range and limit. Accordingly, the modified electrode GC/PANI/NiOnf showed a linear range of detection at 0.1–1 µM and 1–500 µM. At the same time, the limit of detection (LOD) was 9.7 and 64 nM for low and high concentrations, respectively. Furthermore, the kinetic characteristics of nitrite, such as diffusion and transport coefficients, were investigated in various media. Moreover, the charge transfer resistance was utilized for nitrite electrooxidation in different pH values by the electrochemical impedance technique (EIS). The anti-interfering criteria of the modified surfaces were utilized in the existence of many interfering cations in water (e.g., K+, Na+, Cu2+, Zn2+, Ba2+, Ca2+, Cr2+, Cd2+, Pd2+). A real sample of the Nile River was spiked with nitrite to study the activity of the electrode in a real case sample (response time ~4 s). The interaction between nitrite ions and NiO{100} surface was studied using DFT calculations as a function of adsorption energy.

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Section: Resultsmentioning

confidence: 99%

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

et al. 2023

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“…2+ and Cr 3+ sites in octahedral environments [24][25][26]. The signals at g=4.20 are ascribed to Fe 3+ ions in distorted octahedral field [27].…”

Section: + Nimentioning

confidence: 98%

Hydroxylated high-entropy alloy as highly efficient catalyst for electrochemical oxygen evolution reaction

Zhang

et al. 2020

Sci. China Mater.

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“…Ni 2+ -doped calcium-lithium hydroxyapatite (CLHA) nanopowders were synthesized by mechanochemical synthesis by Reddy et al [50]. The spectra of these powder possess four absorption band at 420, 718, 794, and 1189 nm attributed to the transitions of 3 A 2g (F) → 3 T 1g (P), 3 T 1g (F), 1 E 1g (D) (spin-forbidden transition), and 3 T 2g (F), respectively [50]. The chemical potential of the CLHA is drastically affected leading to the modification of conductivity and dielectric properties.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Various fluoridated HAp doped with Eu 3+ ion nanoparticles were prepared by hydrothermal technique and the fluorine ions could influence the crystal field environment for luminescence conversion [49]. Reddy et al observed a strong green emission from Ni 2+ -doped Ca-Li HAp (CLHA) [50]. Erbium-ytterbium-molybdenum tri-doped HA/β-TCP phosphor was synthesized using solid-state reaction by Van et al They demonstrated 650 times higher green emission in the presence of molybdenum [51].…”

Section: Introductionmentioning

confidence: 99%

Impact of Dopants on the Electrical and Optical Properties of Hydroxyapatite

Arul¹,

Ramya²,

Kalkura³

2020

Biomaterials

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This chapter deals with the effect of alternating electrical current on hydroxyapatite [HAp, Ca10(PO4)6(OH)2] and doped HAp along with their optical response and the processes involved. The dielectric constant, permittivity and ac conductivity were analyzed to have an insight into the surface charge polarization phenomenon. Further, the magnitude and the polarity of the surface charges, microstructure, and phases also play significant role in the cell proliferation and growth on the implants. Besides, the mechanism behind the electrical properties and the healing of bone fracture are discussed. The influence of various dopants on the optical properties of HAp viz., absorbance, transmission, band gaps and defects energy levels are analyzed along with the photoluminescence and excitation independent emission. In the future outlook, the analysis of effect of doping is summarized and its impact on the next generation biomaterials are elucidated.

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A novel green-emitting Ni2+-doped Ca-Li hydroxyapatite nanopowders: structural, optical, and photoluminescence properties

Cited by 9 publications

References 45 publications

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

Hydroxylated high-entropy alloy as highly efficient catalyst for electrochemical oxygen evolution reaction

Impact of Dopants on the Electrical and Optical Properties of Hydroxyapatite

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