Effect of atomic hydrogen and oxygen on diamond growth

Sun, Bao-Cun; Xiao-pin, Zhang; Zhang, Qinzhe; Lin, Zhien

doi:10.1063/1.352754

Cited by 30 publications

(13 citation statements)

References 12 publications

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“…A CVD gas mixture consisting of 2% methane (CH4), 6% carbon dioxide (CO2) and 92% hydrogen (H2) was used to grow NCD films while UNCD films were synthesized using 8% CH4, 6% CO2 and 86% H2. Carbon dioxide was added to ensure effective etching of sp2 carbon phases at low temperatures [34,35]. The NCD and UNCD films were grown for 22 h and 10 h, respectively.…”

Section: Diamond Coatingmentioning

confidence: 99%

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Zalieckas

Mondragon

Pobedinskas

et al. 2022

Preprint

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Polycrystalline diamond has the potential to improve the osseointegration of orthopaedic implants compared to conventional materials such as titanium. However, despite the excellent biocompatibility and superior mechanical properties, the major challenge of using diamond for implants, such as those used for hip arthroplasty, is the limitations of microwave plasma chemical vapor deposition (CVD) techniques to synthesize diamond on complex-shaped objects. Here, for the first time we demonstrate diamond growth on titanium acetabular shells using surface wave plasma CVD method. Polycrystalline diamond coatings were synthesized at low temperatures (~400 °C) on three types of acetabular shells with different surface structure and porosity. We achieved the growth of diamond on highly porous surfaces designed to mimic the structure of the trabecular bone and improve osseointegration. Biocompatibility was investigated on nanocrystalline diamond (NCD) and ultrananocrystalline diamond (UNCD) coatings terminated either with hydrogen or oxygen. To understand the role of diamond surface topology and chemistry in the attachment and proliferation of mammalian cells, we investigated the adsorption of extracellular matrix (ECM) proteins, and monitored the metabolic activity of fibroblasts, osteoblasts, and bone marrow-derived mesenchymal stem cells (MSCs). The interaction of bovine serum albumin (BSA) and Type I collagen with the diamond surfaces was investigated by confocal fluorescence lifetime imaging microscopy (FLIM). We found that the proliferation of osteogenic cells was better on hydrogen terminated UNCD than on the oxygen terminated counterpart. These findings correlated with the behaviour of collagen on diamond substrates observed by FLIM. Hydrogen terminated UNCD provided better adhesion and proliferation of osteogenic cells, compared to titanium, while growth of fibroblasts was poorest on hydrogen terminated NCD and MSCs behaved similarly on all tested surfaces. These results open new opportunities for application of diamond coatings on orthopaedic implants.

show abstract

Section: Diamond Coatingmentioning

confidence: 99%

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Zalieckas

Mondragon

Pobedinskas

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The CVD gas mixture consisting of 2% methane (CH4), 6% carbon dioxide (CO2) and 92% hydrogen (H2) was used to grow NCD films while UNCD films were synthesized using 8% CH4, 6% CO2 and 86% H2. Carbon dioxide was added to ensure effective etching of sp2 carbon phases at low temperatures [34,35]. The NCD and UNCD films were grown for 22 h and 10 h, respectively.…”

Section: Diamond Coatingmentioning

confidence: 99%

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Zalieckas

Mondragon

Pobedinskas

et al. 2022

Preprint

View full text Add to dashboard Cite

Polycrystalline diamond has the potential to improve the osseointegration of orthopaedic implants compared to conventional osteo-implant materials such as titanium. However, despite the excellent biocompatibility and superior mechanical properties, the major challenge of using diamond for implants such as those used for hip arthroplasty is the limitations of microwave plasma chemical vapor deposition (CVD) techniques to synthesize diamond on complex-shaped objects. Here, for the first time we demonstrate diamond growth on titanium acetabular shells using surface wave plasma CVD method. Polycrystalline diamond coatings were synthesized at low temperatures (~400 °C) on three types of acetabular shells with different surface structure and porosity. We achieved diamond growth on highly porous surfaces designed to mimic the structure of the trabecular bone and improve osseointegration. Biocompatibility was investigated on nanocrystalline diamond (NCD) and ultrananocrystalline diamond (UNCD) coatings terminated either with hydrogen or oxygen. To understand the role of diamond surface topology and chemistry in attachment and proliferation of mammalian cells we investigated adsorption of extracellular matrix (ECM) proteins, and monitored metabolic activity of fibroblasts, osteoblasts, and bone marrow-derived mesenchymal stem cells (MSCs). The interaction of bovine serum albumin (BSA) and Type I collagen with diamond surface was investigated by confocal fluorescence lifetime imaging microscopy (FLIM). We found that proliferation of MSCs was better on hydrogen terminated UNCD than on oxygen terminated counterpart. These findings corelate to the behaviour of collagen on diamond substrates observed by FLIM. Hydrogen terminated UNCD provides better adhesion and proliferation for MSCs, compared to titanium, while growth of fibroblasts is poorest on hydrogen terminated NCD and osteoblasts behave similarly on all tested surfaces. These results open new opportunities for application of diamond coatings on orthopaedic implants.

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“…was added to O2. Conversely, the synergetic effect of H in CHF3 and O generated a specific etching effect on the diamond [36].…”

Section: Surface Binding Energy and Chemical Environment Analysismentioning

confidence: 99%

Fast smoothing on diamond surface by inductively coupled plasma reactive ion etching

et al. 2019

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Effect of atomic hydrogen and oxygen on diamond growth

Cited by 30 publications

References 12 publications

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Polycrystalline Diamond Coating on Orthopaedic Implants: Realization, and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation

Fast smoothing on diamond surface by inductively coupled plasma reactive ion etching

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