XPS spectral analysis for a multiple oxide comprising NiO, TiO2, and NiTiO3

Sakamoto, Kouta; Hayashi, Fumio; Sato, Kazuyoshi; Hirano, Mitsuhiro; Ohtsu, Naofumi

doi:10.1016/j.apsusc.2020.146729

Cited by 134 publications

(35 citation statements)

References 24 publications

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“…The detailed element information is provided in the survey scan spectra (Figure S2 XPS peaks at 854.9 and 873.2 eV correspond respectively with standard 2p 3/2 and 2p 1/2 orbital energies for NiO; the 2p satellite peaks are also in the expected range at 860 and 880 eV, which confirm the samples only contained Ni(II) even under oxidation treatment. [23,24] S 2p peak energies were also investigated (Figure S3, Supporting Information) showing: The green Cysscy-NiO sample produces an XPS signal with a mode peak at 162.8 eV and a shoulder centered at 164 eV, corresponding to S 2p 3/2 and S 2p 1/2 orbital energies for disulfide bonds, respectively; the brown Cys-NiO sample exhibits an asymmetric doublet at 163.6 and 164.8 eV corresponding to metal-thiolate bonding, and the mode peak of the blue cysteine sulfonate (CysO 3 H) capped NiO sample close to 168 eV associates to the sulfonate ligand. The relative differences in peak energies for sulfide, thiolate, and sulfonate bonding are in agreement with other XPS studies of similar ligands on metal chalcogenide NPs, [25][26][27] and suggest that NaBH 4 serves mainly as a Bronsted base rather than as a reducing agent for nickel ions.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Chiroptical Transitions of Enantiomeric Ligand‐Activated Nickel Oxides

Lin

Liu

Zhu

et al. 2022

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Ligand‐induced chirality in transition‐metal oxide (TMO) nanostructures have great potential for designing materials with tunable chiroptical effects. Herein, a facile strategy is reported to prepare chiroptical active nickel‐oxide hybrids combined with pH adjustment, and the redox treatment results in ligand transformation, which is attributable to multiple optical transitions in the TMO nanostructures. The theoretical calculation also explains the chiral origins based on their complex models based on empirical analysis. It is also shown that enantiomeric TMO nanoparticles can be used as chiral inducers for chiroptical sensitive polymerization. These results demonstrate that TMO nanostructures can provide rational control over photochemical synthesis and chiral transfer of inorganics nanoarchitecture chirality.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Chiroptical Transitions of Enantiomeric Ligand‐Activated Nickel Oxides

Lin

Liu

Zhu

et al. 2022

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“…For the XPS survey spectrum ( Figure S1 ), besides O 1s and Ti 2p peaks, the C 1s peak at 288.3 eV is detected, due to the adventitious hydrocarbon from the air [ 18 ]. For the Ti 2p spectrum ( Figure 2 a), the two main peaks of Ti2p 1/2 at 464.4 eV and Ti2p 3/2 at 458.6 eV are ascribed to Ti 4+ of TiO 2 [ 19 ]. Furthermore, an associated satellite peak located at 458.2 eV is detected [ 20 ], corresponding to Ti 3+ .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Antibacterial Properties of TiO2 Nanospheres with Rutile/Anatase Heterophase Junctions and the Archival Paper Protection Application

2021

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TiO2 has been generally studied for photocatalytic sterilization, but its antibacterial activities are limited. Herein, TiO2 nanospheres with rutile/anatase heterophase junctions are prepared by a wet chemical/annealing method. The large BET surface area and pore size are beneficial for the absorption of bacteria. The rutile/anatase heterojunctions narrow the bandgap, which enhances light absorption. The rutile/anatase heterojunctions also efficiently promote the photogenerated carriers’ separation, finally producing a high yield of radical oxygen species, such as •O2– and •OH, to sterilize bacteria. As a consequence, the obtained TiO2 nanospheres with rutile/anatase heterojunctions present an improved antibacterial performance against E. coli (98%) within 3 h of simulated solar light irradiation, exceeding that of TiO2 nanospheres without annealing (amorphous) and TiO2 nanospheres annealing at 350 and 550 °C (pure anatase). Furthermore, we design a photocatalytic antibacterial spray to protect the file paper. Our study reveals that the TiO2 nanospheres with rutile/anatase heterojunctions are a potential candidate for maintaining the durability of paper in the process of archival protection.

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“…To obtain clues for understanding the phenomena above, Ni 2p and Ti 2p spectra were collected from the topmost surface region of the heated‐treated NiTi surface, as shown in Figure 7. Then, the chemical states were analyzed using the spectral deconvolution procedure, proposed by the authors 16 . Briefly, the procedure uses spectral deconvolution analysis with the standard spectra of NiO, NiTiO 3 , and TiO 2 as components.…”

Section: Resultsmentioning

confidence: 99%

“…The atomic ratio of the detected elements was calculated using the integrated intensity of the spectra and the corresponding relative sensitivity factor recorded in the instrument. Furthermore, overlapping spectra due to the coexistence of multiple chemical states were analyzed using spectral deconvolution procedure reported by the authors 16 . To summarize, reference spectra for each chemical state were collected by measuring a reliable standard material, and then the overlapping spectra were deconvoluted using the reference spectra.…”

Section: Methodsmentioning

confidence: 99%

XPS study on surface modification of NiTi alloy by acidic solution immersion and subsequent heating in air

Sakamoto

Hayashi

Ohtsu

2021

Surface & Interface Analysis

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Changes in the surface chemical state of a nearly equiatomic nickel–titanium (NiTi) alloy caused by immersion in aqueous solutions of HNO3 and H2SO4 as well as subsequent heating in air at 723 K were analyzed using X‐ray photoelectron spectroscopy (XPS). An XPS analysis using angle‐resolved technique and a mathematical deconvolution technique revealed that a passive layer formed in an ambient atmosphere contained TiO2 as a major state and Ni(OH)2 and NiO as minor states. The Ni(OH)2 on the alloy remained in the region even when heated in air at 723 K. Therefore, the resulting layer became a Ti‐oxide layer with Ni segregated region at the surface, which was NiO formed via dehydration of Ni(OH)2. However, immersion in an aqueous solution of HNO3 or H2SO4 enables Ni(OH)2 state to dissolve in the passive layer of a NiTi alloy; thereby, the Ni segregated region rarely appeared in the oxide layer by heating. The Ni segregated region at the surface becomes an obstacle for the inward diffusion of oxygen; thus, the annihilation of such a segregated region results in an increase in the thickness of the oxide layer.

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XPS spectral analysis for a multiple oxide comprising NiO, TiO2, and NiTiO3

Cited by 134 publications

References 24 publications

Chiroptical Transitions of Enantiomeric Ligand‐Activated Nickel Oxides

Chiroptical Transitions of Enantiomeric Ligand‐Activated Nickel Oxides

Enhanced Photocatalytic Antibacterial Properties of TiO2 Nanospheres with Rutile/Anatase Heterophase Junctions and the Archival Paper Protection Application

XPS study on surface modification of NiTi alloy by acidic solution immersion and subsequent heating in air

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