XPS on Nd0.6-Bi Sr0.4MnO3 nano powders

Dudric, Roxana; Bortnic, Rareș; Souca, Gabriela; Lucacel, R. Ciceo; Știufiuc, Rareș; Tetean, R.

doi:10.1016/j.apsusc.2019.04.233

Cited by 32 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, peaks corresponding to 284.2 eV (CC), 285.0 eV (C–C), 285.5 eV (C–N), 288.1 eV (CO), and 288.6 eV (−O–C–O−) can be detected obviously . Double peaks located at 984.2 and 1006 eV are ascribed to Nd 3d 5/2 and Nd 3d 3/2 of Nd 3+ ions, respectively . The electron binding energy of S 2p 3/2 and S 2p 1/2 are found to be 163.9 and 165.1 eV .…”

Section: Resultsmentioning

confidence: 90%

See 1 more Smart Citation

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Zhong

Zha

et al. 2022

Anal. Chem.

View full text Add to dashboard Cite

The low photon energy and deep penetrating ability of near-infrared (NIR) light make it an ideal light source for a photoelectrochemical (PEC) immunosensing system. Absorption wavelengths of the metal−organic frameworks (MOFs) can be regulated by adjusting the metal ions and the conjugation degree of the ligands. Herein, an ionic liquid with a large conjugated structure was synthesized and was used as a ligand to coordinate with Nd ions to prepare Nd-MOF nanorods with a band gap of 1.26 eV. The Nd-MOF rods show a good photoabsorption property from 200 to 980 nm. A PEC platform was constructed by using Nd-MOF nanorods as the photoelectroactive element. A detachable double-stranded DNA labeled with alkaline phosphatase (ALP), which is specific to VEGF165, was immobilized onto the PEC sensing interface. After blocking unspecific active sites with bovine albumin, an NIR PEC aptasensing system was developed for VEGF165 detection. After being incubated in a mixture of VEGF165, Lascorbic acid 2-phosphate (magnesium salt hydrate) (AAP), and chloroauric acid, the aptamers for VEGF165 were detached from the PEC aptasensing interface, thus resulting in the decrease of the charge-transfer resistance and the increase of the photocurrent response. The shedding of the aptamers also makes the ALP approach the electrode surface, thus catalyzing the reduction of AAP to produce ascorbic acid (AA). Subsequently, AA reduces in situ chloroauric acid to produce AuNPs on the Nd-MOF-based sensing interface. With the excellent conductivity and localized surface plasmon resonance effect, the AuNPs can accelerate the separation of electron−hole pairs generated from Nd-MOF nanorods, thus promoting the photoelectric conversion efficiency and achieving signal amplification. Under optimized conditions, the PEC responses were linearly related to the VEGF165 concentrations in the range of 0.01−100 ng mL −1 and exhibit a low detection limit of 3.51 pg mL −1 (S/N = 3). VEGF165 in human serum samples was detected by the NIR PEC aptasensor. Their concentrations were found to be well consistent with that obtained from ELISA. Furthermore, the PEC aptasensor demonstrated recoveries from 96.07 to 103.8%. The relative standard deviations were within 5%, indicating good accuracy and precision. The results further verify its practicability for clinical diagnosis.

show abstract

Section: Resultsmentioning

confidence: 90%

“…30 ions, respectively. 32 The electron binding energy of S 2p 3/2 and S 2p 1/2 are found to be 163.9 and 165.1 eV. 33 As shown in Figure S6, the N 2 adsorption−desorption isotherms of Nd-MOF nanorods show a Brunauer−Emmett−Teller surface area of 280 m 2 g −1 and a total pore volume of 0.17 cm 3 g −1 with a broad pore size variation.…”

Section: Resultsmentioning

confidence: 96%

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Zhong

Zha

et al. 2022

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…Figure 3 presents the XPS spectra of NdFeO 3 and NdCoO 3 , whereas the high-resolution XPS spectra of Nd 3d are listed in Figure 3A,D respectively, indicating the existence of Nd 3+ . 32 In the Fe 2p spectrum (Figure 3B), five clear peaks were located at 710.6, 712.6, 719.1, 724.5, and 733.0 eV. The peaks at 710.6 and 712.6 eV, as well as 724.5 eV corresponded to Fe 2p 3/2 and Fe 2p 1/2 , respectively, whereas concomitant satellite peaks were located at 719.1 and 733.0 eV.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3 presents the XPS spectra of NdFeO 3 and NdCoO 3 , whereas the high‐resolution XPS spectra of Nd 3d are listed in Figure 3A,D. The two strong peaks at 982 and 1004 eV were ascribed to Nd 3d 5/2 and Nd 3d 3/2 , respectively, indicating the existence of Nd 3+ 32 . In the Fe 2p spectrum (Figure 3B), five clear peaks were located at 710.6, 712.6, 719.1, 724.5, and 733.0 eV.…”

Section: Resultsmentioning

confidence: 99%

Syntheses, characterization, magnetic, and electrochemical properties of perovskite‐type NdFeO₃ and NdCoO₃ nanofibers

Yue

Wang

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

In this work, perovskite-type NdFeO 3 and NdCoO 3 nanofibers (NFs) were synthesized, and the magnetic and electrochemical characteristics of the two samples were investigated. The NdFeO 3 NFs showed ferromagnetic performance at 298 K and paramagnetic characteristics at low temperatures, whereas the NdCoO 3 NFs showed paramagnetic behavior. The NdFeO 3 and NdCoO 3 electrodes exhibited favorable electrochemical performance in supercapacitors and Li-ion batteries. Therefore, this study demonstrated the potential applications of NdFeO 3 and NdCoO 3 NFs in the field of condensed matter physics and energy storage devices.

show abstract

“…It was reported that the binding energy values of Mn 2+ , Mn 3+ , and Mn 4+ were in the ranges of 640.6-641.2 eV, 642.0-642.5 eV, and 643.5-644.2 eV, respectively [20][21][22]. Therefore, the three peaks of Mn 2p 3/2 orbital at about 640.8 eV, 642.3 eV, and 643.8 eV corresponded to Mn 2+ , Mn 3+ , and Mn 4+ , respectively [23,24]. Similarly, the XPS spectra of Mg 1 s were analyzed.…”

Section: Xps Studiesmentioning

confidence: 88%

Synthesis, Electronic Structure, and Electrochemical Properties of the Cubic Mg2MnO4 Spinel with Porous-Spongy Structure

Wang

Zhu

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

Mg2MnO4 nanoparticles with cubic spinel structure were synthesized by the sol-gel method using polyvinyl alcohol (PVA) as a chelating agent. X-ray powder diffraction, infrared spectrum (IR), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to characterize the crystalline phase and particle size of as-synthesized nanoparticles. The electronic structure of Mg2MnO4 spinel was studied by X-ray photoelectron spectroscopy (XPS). The results showed that pure cubic Mg2MnO4 spinel nanoparticles were obtained when the annealing temperature was 500–700 °C. The samples had a porous-spongy structure assembled by nanoparticles. XPS studies indicated that Mg2MnO4 nanoparticles were mixed spinel structures and the degree of cation inversion decreased with increasing annealing temperature. Furthermore, the performance of Mg2MnO4 as lithium anode material was studied. The results showed that Mg2MnO4 samples had good cycle stability except for the slight decay in the capacity at 50 cycles. The coulombic efficiency (ratio of discharge and charge capacity) in most cycles was near 100%. The sample annealed at 600 °C exhibited good electrochemical properties, the first discharge capacity was 771.5 mAh/g, and the capacity remained 340 mAh/g after 100 cycles. The effect of calcination temperature on the charge–discharge performance of the samples was studied and discussed.

show abstract

XPS on Nd0.6-Bi Sr0.4MnO3 nano powders

Cited by 32 publications

References 23 publications

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Syntheses, characterization, magnetic, and electrochemical properties of perovskite‐type NdFeO₃ and NdCoO₃ nanofibers

Synthesis, Electronic Structure, and Electrochemical Properties of the Cubic Mg2MnO4 Spinel with Porous-Spongy Structure

Contact Info

Product

Resources

About

XPS on Nd0.6-Bi Sr0.4MnO3 nano powders

Cited by 32 publications

References 23 publications

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Signal-On Near-Infrared Photoelectrochemical Aptasensors for Sensing VEGF165 Based on Ionic Liquid-Functionalized Nd-MOF Nanorods and In-Site Formation of Gold Nanoparticles

Syntheses, characterization, magnetic, and electrochemical properties of perovskite‐type NdFeO3 and NdCoO3 nanofibers

Synthesis, Electronic Structure, and Electrochemical Properties of the Cubic Mg2MnO4 Spinel with Porous-Spongy Structure

Contact Info

Product

Resources

About

Syntheses, characterization, magnetic, and electrochemical properties of perovskite‐type NdFeO₃ and NdCoO₃ nanofibers