Modification of polycrystalline nanodiamonds by using periodic magnetic field enhanced hydrogen plasma and the application on nanogrinding of thin film magnetic head

Liu, Xuezhang; Yu, Zhi‐Ming; Wei, Qiuping; Wen, Guilin; Duan, Xiaohua; You, Xiao‐Zeng

doi:10.1016/j.colsurfa.2012.10.024

Cited by 1 publication

(1 citation statement)

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“…Kozak et al [17] noted a significant increase in the amount of surface C=O groups and disappearance of C-H groups after O 2 radio-frequency discharge plasma treatment of 5-nm DND particles. The opposite effect was observed by Liu et al [18] when hydrogen plasma was used. Arnault et al [19] determined that substrate temperature plays an important role during DND hydrogenation in H 2 microwave plasma.…”

Section: Introductionmentioning

confidence: 71%

Surface modification and stability of detonation nanodiamonds in microwave gas discharge plasma

Stanishevsky

Walock

Catledge

2015

Applied Surface Science

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Detonation nanodiamonds (DND), with low hydrogen content, were exposed to microwave plasma generated in pure H 2 , N 2 , and O 2 gases and their mixtures, and investigated using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Raman, and X-ray photoelectron spectroscopies. Considerable alteration of the DND surface was observed under the plasma conditions for all used gases, but the diamond structure of the DND particle core was preserved in most cases. The stabilizing effect of H 2 in H 2 /N 2 and H 2 /O 2 binary gas plasmas on the DND structure and the temperature-dependent formation of various CNH x surface groups in N 2 and H 2 /N 2 plasmas were observed and discussed for the first time. DND surface oxidation and etching were the main effects of O 2 plasma, whereas the N 2 plasma led to DND surfaces rich in amide groups below 1073 K and nitrile groups at higher temperatures. Noticeable graphitization of the DND core structure was detected only in N 2 plasma when the substrate temperature was above 1103 K.

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Section: Introductionmentioning

confidence: 71%