X-ray photoelectron spectroscopy analysis of plasma-treated surfaces of diamond films

Shirafuji, Junji; Sakamoto, Yoshifumi; Furukawa, A.; Shigeta, Hironori; Sugino, Takashi

doi:10.1016/0925-9635(94)00267-3

Cited by 37 publications

(22 citation statements)

References 7 publications

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“…49 Oxygen plasmatreated diamond typically exhibits an increased amount of C-O-C, C=O oxygen moieties; hence, O-terminated diamond surfaces become hydrophilic. 50,51 These results were similar to the observations from our XPS studies, not published here.…”

supporting

confidence: 82%

Osteogenic cell differentiation on H-terminated and O-terminated nanocrystalline diamond films

Lišková¹,

Babchenko²,

Varga³

et al. 2015

IJN

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Nanocrystalline diamond (NCD) films are promising materials for bone implant coatings because of their biocompatibility, chemical resistance, and mechanical hardness. Moreover, NCD wettability can be tailored by grafting specific atoms. The NCD films used in this study were grown on silicon substrates by microwave plasma-enhanced chemical vapor deposition and grafted by hydrogen atoms (H-termination) or oxygen atoms (O-termination). Human osteoblast-like Saos-2 cells were used for biological studies on H-terminated and O-terminated NCD films. The adhesion, growth, and subsequent differentiation of the osteoblasts on NCD films were examined, and the extracellular matrix production and composition were quantified. The osteoblasts that had been cultivated on the O-terminated NCD films exhibited a higher growth rate than those grown on the H-terminated NCD films. The mature collagen fibers were detected in Saos-2 cells on both the H-terminated and O-terminated NCD films; however, the quantity of total collagen in the extracellular matrix was higher on the O-terminated NCD films, as were the amounts of calcium deposition and alkaline phosphatase activity. Nevertheless, the expression of genes for osteogenic markers – type I collagen, alkaline phosphatase, and osteocalcin – was either comparable on the H-terminated and O-terminated films or even lower on the O-terminated films. In conclusion, the higher wettability of the O-terminated NCD films is promising for adhesion and growth of osteoblasts. In addition, the O-terminated surface also seems to support the deposition of extracellular matrix proteins and extracellular matrix mineralization, and this is promising for better osteoconductivity of potential bone implant coatings.

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supporting

confidence: 82%

Osteogenic cell differentiation on H-terminated and O-terminated nanocrystalline diamond films

Lišková¹,

Babchenko²,

Varga³

et al. 2015

IJN

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“…5, the peak of C1s is shifted toward the lower energy side after the hydrogen process and toward the higher energy side after the oxygen process, relative to the as-prepared materials. These results have a similar tendency to those of XPS reported previously [41,42] and are considered to be caused by the difference in surface processes. As shown in Fig.…”

Section: Electron Emission From Boron-doped Pyramidal Diamondsupporting

confidence: 90%

Electron emission from diamond having negative electron affinity

Yamada

Chang

Okano

et al. 1998

Electron. Comm. Jpn. Pt. II

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“…While this may be true in some cases, surface dipole changes cannot be ruled out in the general case. Thus, such interpretation can be trusted only if it accompanied by complementary evidence, e.g., of PES measurements [681]. Third, usually only changes in Á0 s , rather than its absolute value, are sought.…”

Section: Surface Dipolementioning

confidence: 99%

“…It is this property which makes it possible to consider SPV-based approaches for extracting V 0 s without having to worry about the surface dipole. Second, several authors interpreted treatment-induced W s changes at GaAs [677,678], InP [679], and diamond [680,681] surfaces as being due to changes in the band-bending alone. While this may be true in some cases, surface dipole changes cannot be ruled out in the general case.…”

Section: Surface Dipolementioning

confidence: 99%