Research output: Contribution to journal › Article › peer-review
Studies of buried layers and interfaces of tungsten carbide coatings on the MWCNT surface by XPS and NEXAFS spectroscopy. / Sivkov, Danil; Nekipelov, Sergey; Petrova, Olga; Vinogradov, Alexander; Mingaleva, Alena; Isaenko, Sergey; Makarov, Pavel; Ob'edkov, Anatoly; Kaverin, Boris; Gusev, Sergey; Vilkov, Ilya; Aborkin, Artemiy; Sivkov, Viktor.
In: Applied Sciences (Switzerland), Vol. 10, No. 14, 4736, 01.07.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Studies of buried layers and interfaces of tungsten carbide coatings on the MWCNT surface by XPS and NEXAFS spectroscopy
AU - Sivkov, Danil
AU - Nekipelov, Sergey
AU - Petrova, Olga
AU - Vinogradov, Alexander
AU - Mingaleva, Alena
AU - Isaenko, Sergey
AU - Makarov, Pavel
AU - Ob'edkov, Anatoly
AU - Kaverin, Boris
AU - Gusev, Sergey
AU - Vilkov, Ilya
AU - Aborkin, Artemiy
AU - Sivkov, Viktor
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Currently, X-ray photoelectron spectroscopy (XPS) is widely used to characterize the nanostructured material surface. The ability to determine the atom distribution and chemical state with depth without the sample destruction is important for studying the internal structure of the coating layer several nanometers thick, and makes XPS the preferable tool for the non-destructive testing of nanostructured systems. In this work, ultra-soft X-ray spectroscopy methods are used to study hidden layers and interfaces of pyrolytic tungsten carbide nanoscale coatings on the multi-walled carbon nanotube (MWCNT) surfaces. XPS measurements were performed using laboratory spectrometers with sample charge compensation, and Near Edge X-ray Absorption Fine Structure (NEXAFS) studies using the Russian-German dipole beamline (RGBL) synchrotron radiation at BESSY-II. The studied samples were tested by scanning and transmission electron microscopy, X-ray diffractometry, Raman scattering and NEXAFS spectroscopy. It was shown that the interface between MWCNT and the pyrolytic coating of tungsten carbide has a three-layer structure: (i) an interface layer consisting of the outer graphene layer carbon atoms, forming bonds with oxygen atoms from the oxides adsorbed on the MWCNT surface, and tungsten atoms from the coating layer; (ii) a non-stoichiometric tungsten carbide WC1-x nanoscale particles layer; (iii) a 3.3 nm thick non-stoichiometric tungsten oxide WO3-x layer on the WC1-x/MWCNT nanocomposite outer surface, formed in air. The tungsten carbide nanosized particle's adhesion to the nanotube outer surface is ensured by the formation of a chemical bond between the carbon atoms from the MWCNT upper layer and the tungsten atoms from the coating layer.
AB - Currently, X-ray photoelectron spectroscopy (XPS) is widely used to characterize the nanostructured material surface. The ability to determine the atom distribution and chemical state with depth without the sample destruction is important for studying the internal structure of the coating layer several nanometers thick, and makes XPS the preferable tool for the non-destructive testing of nanostructured systems. In this work, ultra-soft X-ray spectroscopy methods are used to study hidden layers and interfaces of pyrolytic tungsten carbide nanoscale coatings on the multi-walled carbon nanotube (MWCNT) surfaces. XPS measurements were performed using laboratory spectrometers with sample charge compensation, and Near Edge X-ray Absorption Fine Structure (NEXAFS) studies using the Russian-German dipole beamline (RGBL) synchrotron radiation at BESSY-II. The studied samples were tested by scanning and transmission electron microscopy, X-ray diffractometry, Raman scattering and NEXAFS spectroscopy. It was shown that the interface between MWCNT and the pyrolytic coating of tungsten carbide has a three-layer structure: (i) an interface layer consisting of the outer graphene layer carbon atoms, forming bonds with oxygen atoms from the oxides adsorbed on the MWCNT surface, and tungsten atoms from the coating layer; (ii) a non-stoichiometric tungsten carbide WC1-x nanoscale particles layer; (iii) a 3.3 nm thick non-stoichiometric tungsten oxide WO3-x layer on the WC1-x/MWCNT nanocomposite outer surface, formed in air. The tungsten carbide nanosized particle's adhesion to the nanotube outer surface is ensured by the formation of a chemical bond between the carbon atoms from the MWCNT upper layer and the tungsten atoms from the coating layer.
KW - MOCVD
KW - MWCNT
KW - NEXAFS
KW - TEY
KW - WC/MWCNTs
KW - XPS
KW - MULTIWALLED CARBON NANOTUBE
KW - THERMAL-STABILITY
KW - METAL CARBIDES
KW - HIGH-RESOLUTION XPS
KW - OPTICAL-PROPERTIES
KW - MECHANICAL-PROPERTIES
KW - HYBRID MATERIALS
KW - X-RAY
KW - WC1-x
KW - FUNCTIONAL-GROUPS
KW - MWCNTs
KW - PHOTOELECTRON-SPECTROSCOPY
KW - WC1-x/MWCNTs
UR - http://www.scopus.com/inward/record.url?scp=85088633087&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/6a58b0d4-fa51-308b-89ea-b723a4a9e81e/
U2 - 10.3390/app10144736
DO - 10.3390/app10144736
M3 - Article
AN - SCOPUS:85088633087
VL - 10
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
SN - 2076-3417
IS - 14
M1 - 4736
ER -
ID: 61991620