Effects of temperature and Mo2C layer on stress and structural properties in CVD diamond film grown on Mo foil

Long, Fen; Wei, Qiuping; Yu, Zhi‐Ming; Luo, Jiaqi; Zhang, Xiongwei; Long, Hangyu; Wu, Xianzhe

doi:10.1016/j.jallcom.2013.06.146

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…The reason for shifting the G peak position from a low wavenumber to a higher wavenumber is the presence of compressive stress in the Ti-DLC coating. These results are consistent with those reported by Pardo et al and Long et al [ 31 , 32 ].…”

Section: Resultssupporting

confidence: 94%

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Cao

Ouyang

et al. 2018

Materials

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Multilayers of Ti doped diamond-like carbon (Ti-DLC) coatings were deposited on aluminum alloys by filtered cathodic vacuum arc (FCVA) technology using C2H2 as a reactive gas. The effect of different Ti transition layer thicknesses on the structure, mechanical and adhesion properties of the coatings, was investigated by scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), nanoindentation and a scratch tester. The results showed that the Ti transition layer could improve interfacial transition between the coating and the substrate, which was beneficial in obtaining excellent adhesion of the coatings. The Ti transition layer thickness had no significant influence on the composition and structure of the coatings, whereas it affected the distortion of the sp2-C bond angle and length. Nanoindentation and scratch test results indicated that the mechanical and adhesion properties of the Ti-DLC coatings depended on the Ti transition layer thickness. The Ti transition layer proved favorable in decreasing the residual compressive stress of the coating. As the Ti transition layer thickness increased, the hardness value of the coating gradually decreased. However, its elastic modulus and adhesion exhibited an initial decrease followed by an increasing fluctuation. Among them, the Ti-DLC coating with a Ti transition layer thickness of 1.1 μm exhibited superior mechanical properties.

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Section: Resultssupporting

confidence: 94%

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Cao

Ouyang

et al. 2018

Materials

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“…In this case, confocal Raman spectroscopy was used to measure the stress in the catalyst layer. [ 71 ] As shown in Figure 4b,c, Raman features of Si selected from nine locations of G‐Ni 3 S x O 2− x / p‐Si all locate at 520 cm −1 , testifying its “stress‐free” state. [ 72 ] In contrast, four out of nine from the Raman spectra of Ni 3 S 2 / p‐Si redshifted by 2.5 cm –1 , indicative of a tensile stress induced in Si by the catalyst layer.…”

Section: Resultsmentioning

confidence: 99%

Gradient‐Structuring Manipulation in Ni₃S₂ Layer Boosts Solar Hydrogen Production of Si Photocathode in Alkaline Media

Chen

Wang

Nie

et al. 2021

Advanced Energy Materials

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consists of a photocathode and photoanode to drive the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), separately. [5] To fulfill a practical PEC device, the photocathode needs to be placed in the same electrolyte as the photoanode. [6] It has long been known that HER is more favorable in acid than in alkaline solutions when taking the benchmark platinum-based catalysts as an example, due to the lower activation energy of the water dissociation step involved in acid HER. [7,8] Nevertheless, many of the potential photoanode materials and OER catalysts are easily photocorroded or chemically eroded in acidic solutions, [9][10][11] developing highly stable and active photocathode in alkaline solutions is in urgent demand for revolutionizing the hydrogen economy.As an earth-abundant and prevailing material for photovoltaic applications, silicon (Si) holds great perspective for PEC water splitting. [12,13] Specially, the p-type silicon (p-Si) has a suitable conduction band with respect to HER, but tethered by issues such as surface corrosion and sluggish kinetics. [13][14][15] One effectual strategy is to implement a conformal passivation layer to isolate Si from the electrolyte. This has been met with some success with metal oxides, such as TiO 2 [16,17] and NiO x , [18] but exhibiting an obvious trade-off Usingsilicon as a photocathode has long been considered as an ideal pathway toward cost-effective photoelectrochemical (PEC) solar hydrogen production. However, the trade-off between charge transfer efficiency and stability severely restricts the practical application of Si-based PEC devices in alkaline media. Herein, a facile thermo-electrodeposition process to integrate a gradient-structuring Ni 3 S 2 (G-Ni 3 S x O 2−x ) layer to simultaneously protect and act as a catalyst in Si photocathodes in alkaline solutions is reported. The G-Ni 3 S x O 2−x layer not only provides abundant active sites for the hydrogen evolution reaction but also promotes the charge separation and transport and mass transfer. Consequently, the as-fabricated Si photocathodes exhibit an excellent PEC activity under simulated AM1.5G illumination with a high onset potential of 0.39 V versus reversible hydrogen electrode (RHE) and a photocurrent density of −33.8 mA cm −2 at 0 V versus RHE, outperforming the state-of-the-art p-Si based photocathodes. Moreover, the G-Ni 3 S x O 2−x layer possesses a good interfacial contact with the Si substrate with negligible stress at the G-Ni 3 S x O 2−x /Si interface, affording a good durability of over 120 h at >30 mA cm −2 in alkaline media. This gradient-structuring strategy paves new way for engineering highly efficient and durable PEC devices.

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“…In the previous work [27], it was proposed that the shift of 500 cm − 1 band is related to the amount of doping boron in the manner that the higher the boron concentration is, the lower the wavenumber of the maximum 500 cm −1 band is. The broad band at 1500 cm −1 , which assigns to disorder graphite [19], becomes progressively weaker on both substrates as the deposition time increases. It is reasonable that a larger number of sp 2 carbon are presented in grain boundaries at its initial growth stage since the crystal size is smaller and the boundaries' density is higher compared with the film of longer deposition time.…”

Section: Characteristics Of Diamond Filmsmentioning

confidence: 95%

“…The latter would be lower than the former. Long [19] reported that the thermal stress of film can be effectively reduced when the substrate is of thin thickness, especially, approximate to that of film, and Silva [20] argued that the stress can be completely relieved by the plastic deformation of the Cu interlayer.…”

Section: Introductionmentioning

confidence: 99%

Effects of copper interlayer on deposition and flexibility improvement of diamond microelectrode

Long

Wang

Zhang

et al. 2014

Surface and Coatings Technology

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Effects of temperature and Mo2C layer on stress and structural properties in CVD diamond film grown on Mo foil

Cited by 19 publications

References 42 publications

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Gradient‐Structuring Manipulation in Ni₃S₂ Layer Boosts Solar Hydrogen Production of Si Photocathode in Alkaline Media

Effects of copper interlayer on deposition and flexibility improvement of diamond microelectrode

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Effects of temperature and Mo2C layer on stress and structural properties in CVD diamond film grown on Mo foil

Cited by 19 publications

References 42 publications

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Effect of Ti Transition Layer Thickness on the Structure, Mechanical and Adhesion Properties of Ti-DLC Coatings on Aluminum Alloys

Gradient‐Structuring Manipulation in Ni3S2 Layer Boosts Solar Hydrogen Production of Si Photocathode in Alkaline Media

Effects of copper interlayer on deposition and flexibility improvement of diamond microelectrode

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Gradient‐Structuring Manipulation in Ni₃S₂ Layer Boosts Solar Hydrogen Production of Si Photocathode in Alkaline Media