Effects of ion irradiation on chemical and mechanical properties of magnetron sputtered amorphous SiOC

Zare, A.; Su, Qing; Gigax, Jennifer A.; Shojaee, S.A.; Harriman, T.A.; Nastasi, M.; Shao, Lin; Materer, Nicholas F.; Lucca, D.A.

doi:10.1016/j.nimb.2019.03.009

Cited by 7 publications

(10 citation statements)

References 25 publications

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“…The G band is comparably broadened and less pronounced, see Figure 6d−f. As reported in the literature, 21,26,42 such broadbands are characteristics of the disorder and poor crystallinity. The second-order vibrational modes of the 2D and 2G bands nearly disappear, as well as the combination bands of D + G and T + D, indicating the loss of long-range order.…”

Section: Methodsmentioning

confidence: 68%

“…Recently, an amorphous SiOC ceramic composed of aperiodic arranged mixed-bonded Si–O–C tetrahedra units has been reported to be of superior radiation tolerance. − A wide range of irradiation conditions can result in atomic displacement and connectivity topology changes, but there is no sign of crystallization, void formation, or phase segregation. , Through a combination of experiments and modeling, amorphous SiOC ceramic is demonstrated to be “immune” to He-induced damage . However, an amorphous structure usually possesses higher free energy than its crystalline counterpart, which is in a metastable state.…”

Section: Introductionmentioning

confidence: 99%

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Radiation Effects in the Crystalline–Amorphous SiOC Polymer-Derived Ceramics: Insights from Experiments and Molecular Dynamics Simulation

Niu

Gao

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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Radiation-tolerant materials are in great demand for safe operation and advancement of nuclear and aerospace systems. Nanostructuring is a key strategy to improve the radiation tolerance of materials. SiOC polymer-derived ceramics (PDCs) are unique synthetic nanocomposites consisting of β-SiC nanocrystals and turbostratic graphite distributed in amorphous SiOC matrix, which are "all-rounder" materials for many advanced structural and functional applications. Radiation effects in the crystalline−amorphous system have been investigated in detail by experiments and molecular dynamics (MD) simulations. The results indicate that the amorphous SiOC structure retains amorphous accompanied by redistribution of the Si-containing tetrahedra. The graphite is shown to amorphize more easily than β-SiC nanocrystals under the same irradiation condition. The sample richer in oxygen, namely, containing more amorphous SiOC, shows less disordering of graphite, resulting from greater mitigation of radiation damage by the amorphous phase as efficient sinks. This study provides details of the microstructure evolution of SiOC PDCs under ion irradiation, as well as insights for the design and development of advanced ion damage-resistant materials.

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Section: Methodsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Radiation Effects in the Crystalline–Amorphous SiOC Polymer-Derived Ceramics: Insights from Experiments and Molecular Dynamics Simulation

Niu

Gao

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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“…In our preliminary study, we found that pure MoS 2 film has great limitations in its application, and its irradiation resistance is poor, meaning it was necessary to design its anti-irradiation structure [ 8 , 9 ]. Some studies have shown that amorphous structures lack long-range order and do not contain conventional lattice defects, thus offering the possibility of eliminating irradiation damage in polycrystalline solids [ 10 , 11 , 12 , 13 , 14 , 15 ]. For example, amorphous SiOC films deposited by magnetron sputtering showed no signs of crystallization, void formation or segregation in all irradiated samples [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Improvement of the Irradiation Resistance of Amorphous MoS2 Films by Thermal Annealing

Zhang

Gao

et al. 2022

Nanomaterials

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Among the structural materials used in fusion reactors, amorphous materials can effectively inhibit the accumulation and growth of radiation-induced defects, thereby improving irradiation resistance. However, the application of solid lubricating materials should also consider the changes in their lubricating properties after irradiation. This study shows that the ability to inhibit the deterioration of lubricating properties is not reflected in the amorphous MoS2 film. When the ion fluence reached 4.34 × 1014 ion/cm2, its wear life was reduced by two orders of magnitude, reaching 8.2 × 103 revolutions. After the amorphous MoS2 film is vacuum annealed, its structural stability and resistance to deterioration of lubricating properties are improved. When the ion fluence reaches 1.09 × 1015 ion/cm2, for instance, the wear life of the MoS2 film annealed at 300 °C remains at 8.4 × 104 revolutions. The higher irradiation tolerance of MoS2 films comes from the reduction in intrinsic defects by thermal annealing, which increases the internal grain size and volume fraction of grain boundaries, further providing an effective sink for irradiation defects.

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“…Silicon oxycarbide materials have been received over the decades by numerous methods: Chemical vapor deposition (CVD) and its modifications [ 35 , 36 ], magnetron sputtering [ 37 ], spark plasma sintering (SPS) [ 38 ], and the others [ 13 ]. These methods are quite complicated and also require expensive laboratory equipment.…”

Section: Introductionmentioning

confidence: 99%

Chemical Structure and Microstructure Characterization of Ladder-Like Silsesquioxanes Derived Porous Silicon Oxycarbide Materials

et al. 2021

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The aim of this work was to synthesize porous ceramic materials from the SiOC system by the sol-gel method and the subsequent pyrolysis. The usage of two types of precursors (siloxanes) was determined by Si/C ratio in starting materials. It allows us to control the size of the pores and specific surface area, which are crucial for the potential applications of the final product after thermal processing. Methyltrimethoxysilane and dimethyldiethoxysilane were mixed in three different molar ratios: 4:1, 2:1, and 1:1 to emphasize Si/C ratio impact on silicon oxycarbide glasses properties. Structure and microstructure were examined both for xerogels and obtained silicon oxycarbide materials. Brunauer-Emmett-Teller (BET) analysis was performed to confirm that obtained materials are porous and Si/C ratio in siloxanes precursors affects porosity and specific surface area. This kind of porous ceramics could be potentially applied as gas sensors in high temperatures, catalyst supports, filters, adsorbents, or advanced drug delivery systems.

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Effects of ion irradiation on chemical and mechanical properties of magnetron sputtered amorphous SiOC

Cited by 7 publications

References 25 publications

Radiation Effects in the Crystalline–Amorphous SiOC Polymer-Derived Ceramics: Insights from Experiments and Molecular Dynamics Simulation

Radiation Effects in the Crystalline–Amorphous SiOC Polymer-Derived Ceramics: Insights from Experiments and Molecular Dynamics Simulation

The Improvement of the Irradiation Resistance of Amorphous MoS2 Films by Thermal Annealing

Chemical Structure and Microstructure Characterization of Ladder-Like Silsesquioxanes Derived Porous Silicon Oxycarbide Materials

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