Orientation of B-C-N hybrid films deposited on Ni (111) and polycrystalline Ti substrates explored by X-ray absorption spectroscopy |
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Authors: | Md. Abdul Mannan Yuji BabaTetsuya Kida Masamitsu NaganoIwao Shimoyama Norie HiraoHideyuki Noguchi |
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Affiliation: | a Synchrotron Radiation Research Unit, Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japanb Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjyo-1, Saga 840-8502, Japan |
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Abstract: | Orientation of sp2-bonded boron carbonitride (BCN) hybrid films has been investigated. The films were synthesized on Ni (111) and polycrystalline Ti substrates by radio frequency plasma enhanced chemical vapor deposition using tris-dimethylamino borane as a single-source molecular precursor. The deposition was performed at the radiofrequency power 400-800 W at the working pressure 2.6 Pa. Formation of sp2-BCN hybrids in the samples was confirmed by X-ray diffraction (XRD). In the XRD profile, the peak at 26.3° revealed formation of crystalline phase in the samples in which the lattice planes are separated from each other by around 3.5 Å. The D band at ~ 1350 cm− 1 and the G band at ~ 1570 cm− 1 in Raman spectra also suggested presence of graphite-like sp2-B-C-N hybrid bonds. The films were composed of different B-N, B-C, and C-N bonds to form sp2-BCN atomic hybrids confirmed by X-ray photoelectron spectra. Orientation and local structures of the films were studied by near-edge X-ray absorption fine structure (NEXAFS) measurements. The dominant presence of π* and σ* resonance peaks of the sp2 hybrid orbitals in B K-edge NEXAFS spectra revealed preferred formation of sp2-BCN atomic hybrids around B atoms like-BN3 configuration in respect to the plane of Ni (111) substrate. Different orientations were suggested on the basis of polarization dependence of B K-edge and N K-edge of the NEXAFS spectra. |
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Keywords: | Crystalline h-BCN Thin films Chemical vapor deposition Synchrotron radiation X-ray photoelectron spectroscopy Near-edge X-ray absorption fine structure |
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