List of records in nano database
IDs:
351
Authors : |
Kovács,G,J;Koós,A,A;Bertoni,G;Sáfrán,G;Geszti,O;Serin,V;Colliex,C;Radnóczi,G |
Title : |
Structure and spectroscopic properties of C-Ni and CNx-Ni nanocomposite films |
JournalName : |
Journal of Applied Physics |
PubDateYear : |
2005 |
PubDateOther : |
|
Volume : |
98 |
Issue : |
|
StartPage : |
034313 |
EndPage : |
034313 |
Keywords : |
TOP_NanoStructDet;E_Composites |
Notes : |
|
Abstract : |
Magnetron-sputtered carbon-nickel and carbon-nitride-nickel thin films were investigated by high-resolution transmission electron microscopy HRTEM, energy dispersive x-ray spectroscopy, electron-energy-loss spectroscopy EELS andd scanning tunneling microscopy/spectroscopy STM/STS to clarify the relationship between the structure and the spectroscopic properties. The films were deposited in argon or nitrogen plasma at temperatures from 25 to 800 °C. The microstructures can be described as a nanocomposite, built from Ni or Ni3C nanocrystals in a carbon/CNx matrix. The nanocomposite shows columnar structure up to 200 °C deposition temperature, and above this
temperature gradually changes to globular morphology. The C/CNx matrix also grows thicker as the deposition temperature increases. The matrix is amorphous at high nitrogen content and low
deposition temperature and it is ordered into 3–5 layer thick graphitic shells around the Ni3C or Ni
crystallites at higher temperatures. The surface roughness of the nanocomposite ranges between 0.7
and 2.3 nm, increasing with increasing deposition temperature. EELS measurements confirm the
expected chemical interaction between nickel and carbon. EELS suggests that the nitrogen is
incorporated only into the matrix in CNx–Ni samples, mainly with sp1 bonds for deposition
temperature below 500oC. STS investigations show that the conductivity increases with increasing
deposition temperature. A conductivity gap of 1–2 V exists in the nanocomposite films. A structural
model based on the HRTEM investigation is given that can describe the spectroscopic properties and
their behavior with the deposition temperature. |
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