Defect-related luminescence properties of hydroxyapatite nanobelts

Huerta, Verónica J.; Fernández, Paloma; Gómez, Virginia; Graeve, Olivia A.; Herrera, Manuel

doi:10.1016/j.apmt.2020.100822

Cited by 22 publications

(18 citation statements)

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“…Figure 8a displays the HAp spectra with a strong emission at 410 nm (blue), which is attributed to a significant amount of vacancy defects in the lattice due to the synthesis process, as reported by Zhang et al, where HAp did not reveal luminescence by itself [44]. These defects may be related to oxygen vacancies from the PO 4 3− and OH − ions [45][46][47][48]. The FTIR spectra confirmed oxygen vacancies and loss of a complete OH − ion because the bands were weak.…”

Section: Photoluminescence Spectroscopysupporting

confidence: 59%

Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

et al. 2021

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Hydroxyapatite (HAp) and hydroxyapatite/multi-walled carbon nanotube (MWCNT) composites were obtained by the co-precipitation method, followed by ultrasound-assisted and microwave radiation and thermal treatment at 250 °C. X-ray diffraction (XRD) confirmed the presence of a hexagonal phase in all the samples, while Fourier-transform infrared (FTIR) spectroscopy elucidated the interaction between HAp and MWCNTs. The photoluminescent technique revealed that HAp and the composite with non-functionalized MWCNTs present a blue luminescence, while the composite with functionalized MWCNTs, under UV-vis radiation shows an intense white emission. These findings allowed presentation of a proposal for the use of HAp and HAp with functionalized MWCNTs as potential materials for optoelectronic and medical applications.

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Section: Photoluminescence Spectroscopysupporting

confidence: 59%

Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

et al. 2021

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“…7, the HAp sample presents five bands which were associated with lattice defects or impurities as oxygen vacancies from PO 4 3À (368 nm, 3.4 eV), OH À ion vacancies (405 nm, 3.1 eV), OH À and H + ion vacancies (444 nm, 2.8 eV), and Ca 2+ vacancies of oxygen (530 nm, 2.3 eV). 59 On the other hand, the spectrum of Zn-HAp sample reveals low emission intensity due to the presence of Zn. Ion doping inhibits electron-hole recombination and possible enhanced photocatalytic activity of Zn-Hap, in consequence.…”

Section: Resultsmentioning

confidence: 99%

Zinc-doped hydroxyapatite: an UVA light photocatalyst for the removal of bisphenol A

et al. 2022

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“…We used the EPR technique to further corroborate the presence of point defects and different paramagnetic radicals in the HAP nanolattice. Figure b shows the EPR spectra identifying three different paramagnetic substances of HAP . The first signal g = 2.038 is associated with organic radicals, −OH in hydroxyapatite, for which the orbital magnetic moment is almost derived from the spin of the electron.…”

Section: Resultsmentioning

confidence: 99%

“…The completely ideal periodic crystal structure of HAP does not exist, and the presence of structural defects during crystallization results in the formation of vacancies within the lattice due to the synthesis conditions, of which oxygen and calcium are the most common . HAP allows various structural deformations due to its high degree of structural flexibility. , The formation of point defects in ionically substituted HAP causes changes in its electronic configuration, while the presence of different paramagnetic radicals affects the properties of the material.…”

Section: Introductionmentioning

confidence: 99%

High Anticorrosion Properties due to Electron Spin Polarization of Hydroxyapatite with Point Defects

Yang

Guo

Zhou

et al. 2022

Ind. Eng. Chem. Res.

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Hydroxyapatite (HAP) with point defects was designed under simple liquid-phase conditions. The presence of V O , O − radical vacancies, and −OH radicals achieved the capture of oxygen. The spin state jump of Cu is stimulated to produce more unpaired electrons. Spin-polarized electrons undergo rapid exchange with oxygens, promoting the protonation of oxygen molecules. In addition, the formation of stable chlorapatite in the OH-channel of HAP imparts excellent shielding properties to the material. The unique thin lamellar and more active electrode storage charge surface give it some electron storage capacity, providing good electrochemical cathodic protection for iron substrates. As a result, the impedance value of Cu-HAP as an anticorrosion material was improved by 501.6% compared with that of epoxy resin. The anticorrosion study of transitionmetal-based inhibitors based on the 3d orbital electronic structure depends on spin-dependent electron transfer. This work provides some insight into the development of the corrosion protection field.

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Defect-related luminescence properties of hydroxyapatite nanobelts

Cited by 22 publications

References 50 publications

Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

Zinc-doped hydroxyapatite: an UVA light photocatalyst for the removal of bisphenol A

High Anticorrosion Properties due to Electron Spin Polarization of Hydroxyapatite with Point Defects

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