Changes in the chemical state of metallic Cr during deposition on a polyimide substrate: Full soft XPS and ToF-SIMS depth profiles

Kubo, Yugo; Sonohara, Yuichi; Uemura, Shigeaki

doi:10.1016/j.apsusc.2021.149437

Cited by 22 publications

(10 citation statements)

References 69 publications

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“…The Figure 2(a) shows that the main elements of the synthesized LDHs are Zn, Cr, O and C. The XPS spectrum of Zn in Figure 2(d) shows two main peaks at about 1021.53 eV and 1044.59 eV, which are assigned to Zn 2p (1/2) and Zn 2p (3/2), [27] respectively, which prove to be Zn−O and a divalent double metal oxide [28] . The Figure 2(c) double characteristic peaks of Cr at 577.79 eV and 586.17 eV, corresponding to Cr−O and Cr 2p (3/2) and Cr 2p (1/2) of trivalent bimetallic oxide, respectively [29] . The XPS spectrum of O1s is shown in Figure 2(b), and peaks at 531.10 eV, 532.73 eV, and 529.48 eV correspond to a Cr−O bond, a C=O bond, and a Zn−O bond in the carboxylic acid group.…”

Section: Resultsmentioning

confidence: 94%

Superb Adsorption of Congo Red by Zn‐Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge

Kong

Xie

et al. 2022

ChemistrySelect

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It is a challenge to achieve the harmless treatment and resourceful use of various metal elements in electroplating sludge, and converting them into functional materials has become an important technological direction. Based on the existence of various metal ions in electroplating sludge, sodium oleate intercalated Zn−Cr‐LDHs (Zn−Cr‐layered double hydroxides) were prepared by two‐phase solution heating method. The adsorption process of the prepared LDHs for Congo red (CR) in aqueous solution can be described by Langmuir isotherm model and pseudo‐second‐order kinetic model and the maximum adsorption capacity is 2750.43 mg/g. The results of TEM and XPS show that the adsorption mechanism is dominated by electrostatic adsorption, ion exchange process, hydrogen bonding interaction and surface complexation. Therefore, this paper provides a strategy for recovering metal elements from electroplating sludge to prepare LDHs adsorption materials with ultra‐high adsorption capacity.

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Section: Resultsmentioning

confidence: 94%

Superb Adsorption of Congo Red by Zn‐Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge

Kong

Xie

et al. 2022

ChemistrySelect

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“…For example, the depth resolution in our measurement system (∼10 nm) exceeds the PtTe 2 film thickness, resulting in the inclusion of chemical information in the depth profile of the AlO x substrate. Monatomic ions used for sputtering compound semiconductors can result in preferential sputtering of volatile components of the compound and changes in the chemical state and surface structure ( Kubo et al., 2021 ; Yufit et al., 2008 ). Furthermore, the transport studies of PtTe 2 were conducted only for the 4-nm-thick polycrystalline films.…”

Section: Resultsmentioning

confidence: 99%

Air-stable van der Waals PtTe2 conductors with high current-carrying capacity and strong spin-orbit interaction

Song¹,

Oh²,

Jang³

et al. 2022

iScience

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“…For HAXPES, θ was varied to observe changes in the chemical state at various depths from the sample surface. More information regarding the shallower regions was derived by using a lower θ. ,− According to the TPP–2M formula, , the inelastic mean free path λ was 12.6 nm for the photoelectrons with a kinetic energy of 7662 eV, corresponding to C 1s, and the bulk Al matrix (density: 2.7 g/cm 3 ). The θ values of 30 and 80° enabled analysis at maximum depths of 18.9 and 37.2 nm, respectively, which were calculated from 3λ × sin θ (95% of the signal was derived from 3λ) …”

Section: Resultsmentioning

confidence: 99%

“…In this study, we developed a novel analytical approach to link the morphology, diffusion, and chemical interactions to the adhesion at the interface between the FP coating and metal substrate. First, a cryogenic setup was employed to reduce the electron beam damage during TEM observation. , In addition, the samples were fabricated by an improved process to model the FP–metal interface for analysis by synchrotron hard XPS (HAXPES). ,,− The fabrication process is based on that previously proposed for a Cu/PI bilayer structure, which can control the Cu film thickness to a precision of 1 nm, and has been used to laminate flexible printed circuits with Cu . We used these techniques to clarify the changes in the elemental diffusion and chemical bonding state at the interface between a fluorinated ethylene–polypropylene (FEP) coating and Al substrate due to the 1000 keV electron irradiation.…”

Section: Introductionmentioning

confidence: 99%

High-Energy Electron-Irradiated Fluorinated Ethylene Polypropylene Copolymer Coatings on Al Substrates for Enhanced Metal Adhesion and Protection

Kubo

Sonohara

Uemura

et al. 2022

ACS Appl. Nano Mater.

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Fluorocarbon polymers (FPs) are ideal coatings for sliding parts in automotive, medical, or semiconductor manufacturing equipment owing to their excellent nonadhesiveness, low friction, and high heat and chemical resistance. FPs are used as coatings of slide bearings, oil pumps, sliding packing in automobiles, robot housing in biomedical fields, and the inner surface of the exhaust duct in semiconductor manufacturing equipment. However, the nonadhesiveness of FPs hinders their adhesion to metals, preventing their application. Recently, high-energy electron irradiation during the coating process above the melting point of FPs and under anoxic conditions has been proven to enhance the adhesion of FPs to metal substrates. However, the mechanism underlying this phenomenon remains unveiled because the investigation of the buried interface is difficult. Herein, we fabricated samples of fluorinated ethylene–polypropylene (FEP) coating an Al substrate using a unique approach based on semiconductor manufacturing processes to clarify the morphology and chemical interactions of the Al–FEP interface. Time-of-flight secondary ion mass spectrometry showed that the uncoated Al surface comprised 0.5 nm-thick Al hydroxides. Scanning transmission electron microscopy–energy-dispersive X-ray spectroscopy showed that a 1000 keV electron irradiation during the coating process caused a significant diffusion of F atoms from the FEP layer to Al. Soft X-ray photoelectron spectroscopy (XPS) clearly indicated that the O atoms in the native Al2O3 layer were substituted by F atoms. Hard XPS showed the appearance of strong C–O–Al bonds caused by the irradiation. These results stem from the irradiation-induced cleavage of the C–F bonds in the FEP coating and O–Al–O bonds in the native Al2O3, facilitating the diffusion of F atoms and the formation of C–O–Al bonds, improving the adhesion between the FEP coating and Al substrate. Thus, high-energy electron irradiation modified the nanostructure at the Al–FEP interface through the FEP layer.

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Changes in the chemical state of metallic Cr during deposition on a polyimide substrate: Full soft XPS and ToF-SIMS depth profiles

Cited by 22 publications

References 69 publications

Superb Adsorption of Congo Red by Zn‐Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge

Superb Adsorption of Congo Red by Zn‐Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge

Air-stable van der Waals PtTe2 conductors with high current-carrying capacity and strong spin-orbit interaction

High-Energy Electron-Irradiated Fluorinated Ethylene Polypropylene Copolymer Coatings on Al Substrates for Enhanced Metal Adhesion and Protection

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