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Role of Fe and Ni Nanoparticles on Mechanical Properties of Alumina Thin Films deposited by Laser Ablation

Published online by Cambridge University Press:  01 February 2011

Sergey Yarmolenko ,
Sudheer Neralla ,
Dhananjay Kumar ,
Jag Sankar ,
Fude Liu  and
Gerd Duscher
Sergey Yarmolenko
Affiliation:
sergey@ncat.edu, North Carolina Agricultural &Technical State University, Mechanical and Chemical Engineering, 1105, Yanceyville St,, Apt # F, Greensboro, NC, 27405, United States, 336-681-7549, 336-256-1153
Sudheer Neralla
Affiliation:
sn010089@ncat.edu, North Carolina A&T State University, Mechanical and Chemical Engineering, United States
Dhananjay Kumar
Affiliation:
kumar@ncat.edu, North Carolina Agricultural & Technical State University, Mechanical and Chemical Engineering, United States
Jag Sankar
Affiliation:
sankar@ncat.edu, North Carolina Agricultural & Technical State University, Mechanical and Chemical Engineering, United States
Fude Liu
Affiliation:
fliu2@ncsu.edu, North Carolina State University, Materials Science and Engineering, United States
Gerd Duscher
Affiliation:
gerd_duscher@ncsu.edu, North Carolina State University, Materials Science and Engineering, United States
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Abstract

This paper reports our recent work on the improved mechanical properties of alumina thin films with embedded Fe and Ni nanoparticle layers. The Fe/Ni nanoparticles-alumina composite thin films have been deposited using a multi-target pulsed laser ablation technique. Every film consists of 10 layers of alumina and 9 intermediate layers of Fe or Ni nanoparticles. Alumina layer thickness kept constant (∼22 nm) and total thickness of multilayered films was in range 220-280 nm depending on metal deposition time. Composite thin films were deposited at six different substrate temperatures in the range 200-800°C. The mechanical properties measurements, performed by nanoindentation in continuous stiffness mode and applying Nix-Bhattacharya (hardness H) and King's model (Young's modulus E) for film-only properties, have shown that pure alumina films deposited at temperatures 200-500°C are relatively soft (H = 15 GPa, E = 190 GPa), while films deposited at ≥600°C are significantly harder (H = 32 GPa, E = 320 GPa). Grazing incidence XRD (GIXRD) data indicated that γ-alumina peaks exist in high temperature samples while alumina films deposited at ≥500°C were amorphous. Embedding Ni and Fe nanoparticle layers at 500°C led to significant increase of H and E (31 GPa and 365 GPa with Fe and 33 GPa and 380 GPa with Ni) and appearance of γ-alumina peaks in GIXRD. Embedding on metal nanoparticle layers does not change mechanical properties of alumina films deposited at 200°C, and significant hardening of metal containing films starts at 400°C. These results suggest that metal nanoparticles have a catalytic effect on the growth of alumina thin films with enhanced crystallinty. The effect of Ni and Fe nanoparticle size on mechanical properties of thin films has been studied times at substrate temperature 500°C using eight different metal deposition. HRTEM data have shown that metal nanopartiles have uniform particle size distribution and inter-particle separation in the layer. Size of Ni and Fe nanoparticles with highest effect on mechanical properties was 4 -6 nm.

Keywords

hardnesslaser ablationnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 890: Symposium Y – Surface Engineering for Manufacturing Applications , 2005 , 0890-Y08-38
Copyright
Copyright © Materials Research Society 2006

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References

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