Surface chemical modification of CVD diamond films by laser irradiation

Zhang, Dawei; Cui, Yu-xiao

doi:10.1016/j.ijrmhm.2019.02.017

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…In the C 1s XPS of PZC-0 derived carbon, the peak centered at 283.68 eV is ascribed to C-C and C=C groups [23]. The C 1s XPS of PZC-x (x = 1, 2, 3) derived ceramics shows a dominating component positioned at around 284 eV, corresponding to the C=C and C-C groups, which is the energy of C 1s core level in the carbon species of aromatic ring [24,25]. The shift of the peak position implies the potential interaction between zirconium and the carbon phase, as confirmed by the presence of Zr-C bond.…”

Section: Xps Analysis Of Pzc-derived Carbonsmentioning

confidence: 99%

Effect of ZrC Formation on Graphitization of Carbon Phase in Polymer Derived ZrC–C Ceramics

et al. 2019

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Graphitization degree of carbon matrix in ZrC-modified carbon composites is crucial to mechanical and ablation properties of the materials. In order to investigate the effect of ZrC formation on graphitization of the carbon matrix, microstructure of the carbon phase was investigated by X-ray (XRD), Raman, and X-ray photoelectron spectroscopy (XPS) analysis of the ceramic products obtained from zirconium containing polymer precursors at different pyrolysis temperatures. Compared with pure carbon phase, significant increase of average crystal thickness and microcrystalline planar size was observed in the carbon phase of the ZrC-C ceramics, together with the decrease of interlayer spacing and integrated intensity ratio of D peak to the G peak, indicating a significantly increased graphitization degree during the formation of ZrC. With the increasing ZrC content, amorphous (A) carbon was reduced remarkably, while turbostratic (T) component and graphitic (G) carbon components were increased, showing a slight higher graphitization degree. Moreover, the formation of ZrC was the key "ice breaking" step to decrease the defects and improve structure order of the carbon matrix. And the graphitization was dramatically enhanced during carbothermal reduction to create ZrC by breaking the carbon structure. Furthermore, coarsening and aggregation of ZrC particles as a result of high-temperature heat-treatment at 2500 • C and a high content of ZrC exhibit some negative influences on the structure of the carbon phase in ZrC-C ceramics.

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Section: Xps Analysis Of Pzc-derived Carbonsmentioning

confidence: 99%

Effect of ZrC Formation on Graphitization of Carbon Phase in Polymer Derived ZrC–C Ceramics

et al. 2019

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“…The SEM with a spatial resolution of sub-50 nm generates the image of a sample by detecting the reflected electrons focusing only on the surface. The SEM provides a relatively simple, relatively quick and a less costly method to study samples with diverse geometries [108,132,134]. However, an application of SEM to diamond batch processing is limited as the measurements require a compensation for a non-conducting (i.e., diamond) sample charge accumulation [135].…”

Section: Characterisation Of Micromachined Diamond Samplesmentioning

confidence: 99%

“…The X-ray analytical techniques, such as X-ray photoelectron spectroscopy (XPS) [49,145,146] also known as electron spectroscopy for chemical analysis (ESCA) and X-ray powder diffraction (XRD) [134] are capable of providing precise qualitative and quantitative information about the composition and structure of diamond samples. High resolution XPS/ESCA measurements are able to yield a valuable information concerning the chemical composition at the uppermost surface and/or subsurface areas (down to a few hundred of nanometres), the information about the abundance of the sp 2 and sp 3 fractions, and their relative phase ratios and, a precise information about the DOS from valence band edge regions [147].…”

Section: Characterisation Of Micromachined Diamond Samplesmentioning

confidence: 99%

Femtosecond laser micromachining of diamond: Current research status, applications and challenges

Ali

Litvinyuk

Rybachuk

2021

Carbon

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Ultra-fast femtosecond (fs) lasers provide a unique technological opportunity to precisely and efficiently micromachine materials with minimal thermal damage owing to the reduced heat transfer into the bulk of the work material offered by short pulse duration, high laser intensity and focused optical energy delivered on a timescale shorter than the rate of thermal diffusion into the surrounding area of a beam foci. There is an increasing demand to further develop the fs-machining technology to improve the machining quality, minimize the total machining time and increase the flexibility of machining complex patterns on diamond. This article offers an overview of recent research findings on the application of fs-laser technology to micromachine diamond. The laser technology to precisely micromachine diamond is discussed and detailed, with a focus on the use of fs-laser irradiation systems and their characteristics, laser interaction with various types of diamonds, processing and the subsequent post-processing of the irradiated samples and, appropriate sample characterisation methods. Finally, the current and emerging application areas are discussed, and the challenges and the future research prospects in the fs-laser micromachining field are also identified.

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“…In this process, a chemical precursor is vaporized and then deposited onto a substrate, where it reacts with the surface to form a thin film coating. CVD can be used to create a variety of coatings, including those that are resistant to wear, corrosion, or heat [13].…”

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confidence: 99%