Nd2O3: novel synthesis and characterization

Yuvakkumar, R.; Hong, Sun Ig

doi:10.1007/s10971-015-3629-0

Cited by 63 publications

(28 citation statements)

References 39 publications

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“…Compared with the Eg value of γ-Al2O3, the Eg of Al-Nd-5 binary oxide increases to 3.54 eV probably due to the presence of highly dispersed Nd2O3 nanoparticles, whereas the Eg of the binary oxides decreases to a minimum value (Eg = 3.13 eV) at higher Nd2O3 concentration, as observed in the Regarding the spectra of the binary oxides, the band between 240 and 315 nm from the alumina is present. In contrast, the intense and narrow absorption bands between 320 and 740 nm due to internal transitions in Nd 3+ are slightly shifted to lower wavelengths due to a chemical interaction between Nd 2 O 3 and γ-Al 2 O 3 phases [9,27,28]. The absorption band in the UV region of pristine Nd 2 O 3 was used to determine the band gap energy (E g ) in the mixed oxides as these signals are produced by transference of electrons between the valence and conduction bands [9,26,29] and because this band is clearly defined in all the spectra and it is overlapped with the absorption band of γ-Al 2 O 3 .…”

Section: Materials Band Gap Energy (Ev) γ-Al2o3mentioning

confidence: 98%

Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method

et al. 2020

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This paper reports the sol-gel synthesis of Al2O3-Nd2O3 (Al-Nd-x; x = 5%, 10%, 15% and 25% of Nd2O3) binary oxides and the photodegradation of diclofenac activated by UV light. Al-Nd-based catalysts were analyzed by N2 physisorption, XRD, TEM, SEM, UV-Vis and PL spectroscopies. The inclusion of Nd2O3 in the aluminum oxide matrix in the 10–25% range reduced the band gap energies from 3.35 eV for the γ-Al2O3 to values as low as 3.13–3.20 eV, which are typical of semiconductor materials absorbing in the UV region. γ-Al2O3 and Al-Nd-x binary oxides reached more than 92.0% of photoconverted diclofenac after 40 min of reaction. However, the photocatalytic activity in the diclofenac degradation using Al-Nd-x with Nd2O3 contents in the range 10–25% was improved with respect to that of γ-Al2O3 at short reaction times. The diclofenac photoconversion using γ-Al2O3 was 63.0% at 10 min of UV light exposure, whereas Al-Nd-15 binary oxide reached 82.0% at this reaction time. The rate constants determined from the kinetic experiments revealed that the highest activities in the aqueous medium were reached with the catalysts with 15% and 25% of Nd2O3, and these compounds presented the lowest band gap energies. The experimental results also demonstrated that Nd2O3 acts as a separator of charges favoring the decrease in the recombination rate of electron-hole pairs.

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Section: Materials Band Gap Energy (Ev) γ-Al2o3mentioning

confidence: 98%

Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method

et al. 2020

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“…Indonesia has a lot of natural resources of cerium oxide (CeO2) and neodymium oxide (Nd2O3) classified in REE [5]. The CeO2 and Nd2O3 have great potential to produce new various antibiotics [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that G-CeO2 nanoparticles had higher activity than C-CeO2 against Escherichia coli, Pseudomonas aeruginosa, Streptococcus pneumonia, and Proteus Vulgaris bacteria [7]. The CeO2 nanoparticles also obtain a good antibacterial activity towards both gram-negative and positive bacteria because it has Ce 3+ ions and rich surface oxygen vacancies [8].…”

Section: Introductionmentioning

confidence: 99%

ANALYSIS OF STRUCTURE AND ANTIMICROBIAL ACTIVITY OF CeO2 AND Nd2O3 NANOPARTICLES

Yuliani

Mayasari

Kalembang

et al. 2019

SPEKTRA

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Cerium oxide (CeO2) and Neodymium oxide (Nd2O3) nanoparticles using local content have been synthesized by precipitation method. The CeO2 and Nd2O3 nanoparticles were characterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) to analyze the material phase and structure. The XRD spectrum shows that CeO2 and Nd2O3 nanoparticles have face-centered cubic and hexagonal, and cubic, respectively. The anti-microbial activity of CeO2 and Nd2O3 nanoparticles was analyzed by diffusion method using gram-negative bacteria (E.coli, S.aeureus, P. aeruginosa), and gram-positive bacteria (S. entericatyphi, L. monocyogenes), and fungus (C. albicans). The result confirms that CeO2 and Nd2O3 nanoparticles have the capability of patogen microbia inhibition. The CeO2 nanoparticles have the effective activities of inhibition for the microbia of S. aereus and S. entericatyphi, whereas Nd2O3 nanoparticles can inhibit the microbia of P. aeruginosa, S. entericatyphi, and L. monocyogenes.

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“…The shoulder and broad foot of the low‐binding energy side of 3d XPS were observed for Nd 2 O 3 . Nd 2 O 3 has attracted a great attention of researchers in various fields including photonics, advanced materials, and protective coatings . The microstructural changes in Nd 2 O 3 were examined employing XPS studies .…”

Section: Introductionmentioning

confidence: 99%

X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

Bruncková

Kolev

Kaňuchová

2018

Surface & Interface Analysis

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Neodymium niobate NdNbO4 (NNO) and tantalate NdTaO4 (NTO) thin films (~100 nm) were prepared by sol‐gel/spin‐coating process on Al2O3 substrate with LaNbO4/PbZrO3 interlayer and annealing at 1000°C. Surface chemistry was investigated by X‐ray photoelectron spectroscopy (XPS). The core‐level XPS studies of sol‐gel NNO and NTO were performed for the first time. The binding energy differences Δ(O―Nb) and Δ(O―Ta) were used to characterize average energies of Nb―O bonding in NNO (322.9 eV) and Ta―O bonding in NTO (504.2 eV). The XPS demonstrated single valence state of Nd (Nd3+) in precursors. Nd concentration (at. %) decreases from 22% in precursors to 7% in films considering the substrate contains C, Al, Si, Pb, and Zr elements (37%) at Nb or Ta (5%) and O (51%). The X‐ray diffraction analyses verified formation of the monoclinic (M‐NdNbO4 or M′‐NdTaO4), orthorhombic (O‐NdNbO4) and tetragonal (T‐NdTaO4) phases in precursors and films. Single valence state of Nd3+ was confirmed in these films designed for the application in environmental electrolytic thin film devices.

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Nd2O3: novel synthesis and characterization

Cited by 63 publications

References 39 publications

Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method

Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method

ANALYSIS OF STRUCTURE AND ANTIMICROBIAL ACTIVITY OF CeO2 AND Nd2O3 NANOPARTICLES

X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

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