X-ray photoemission spectroscopy of nitrogen-doped UNCD/a-C

H films prepared by pulsed laser deposition

Sausan Al-Riyami, Shinya Ohmagari, Tsuyoshi Yoshitake

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    Nitrogen-doped ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) films were deposited by pulsed laser deposition (PLD). Nitrogen contents in the films were controlled by varying a ratio in the inflow amount between nitrogen and hydrogen gases. The film doped with a nitrogen content of 7.9 at.% possessed n-type conduction with an electrical conductivity of 18 Ω- 1 cm- 1 at 300 K. X-ray photoemission spectra, which were measured using synchrotron radiation, were decomposed into four component spectra due to sp2, sp3 hybridized carbons, C=N and C-N. A full-width at half-maximum of the sp3 peak was 0.91 eV. This small value is specific to UNCD/a-C:H films. The sp2/(sp3 + sp2) value was enhanced from 32 to 40% with an increase in the nitrogen content from 0 to 7.9 at.%. This increment probably originates from the nitrogen incorporation into an a-C:H matrix and grain boundaries of UNCD crystallites. Since an electrical conductivity of a-C:H does not dramatically enhance for this doping amount according to previous reports, we believe that the electrical conductivity enhancement is predominantly due to the nitrogen incorporation into grain boundaries.

    Original languageEnglish
    Pages (from-to)510-513
    Number of pages4
    JournalDiamond and Related Materials
    Volume19
    Issue number5-6
    DOIs
    Publication statusPublished - May 2010

    Fingerprint

    Diamond
    Pulsed laser deposition
    Photoelectron spectroscopy
    X ray spectroscopy
    pulsed laser deposition
    Diamonds
    Nitrogen
    photoelectric emission
    diamonds
    nitrogen
    spectroscopy
    x rays
    electrical resistivity
    Grain boundaries
    grain boundaries
    carbon
    Amorphous carbon
    Photoemission
    Full width at half maximum
    Synchrotron radiation

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Materials Chemistry
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Physics and Astronomy(all)
    • Chemistry(all)

    Cite this

    X-ray photoemission spectroscopy of nitrogen-doped UNCD/a-C : H films prepared by pulsed laser deposition. / Al-Riyami, Sausan; Ohmagari, Shinya; Yoshitake, Tsuyoshi.

    In: Diamond and Related Materials, Vol. 19, No. 5-6, 05.2010, p. 510-513.

    Research output: Contribution to journalArticle

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