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Conference Paper: Role of Fe and Ni nanoparticles on mechanical properties of alumina thin films deposited by laser ablation

TitleRole of Fe and Ni nanoparticles on mechanical properties of alumina thin films deposited by laser ablation
Authors
KeywordsAlumina
Iron
Laser Ablation
Mechanical Properties
Thermal Effects
Thin Films
Issue Date2006
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.html
Citation
Materials Research Society Symposium Proceedings, 2006, v. 890, p. 189-194 How to Cite?
AbstractThis paper reports our recent work on the improved mechanical properties of alumina thin films with embedded Fe and Ni nanopaiticle 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 lime. 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. © 2006 Materials Research Society.
Persistent Identifierhttp://hdl.handle.net/10722/91418
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorYarmolenko, Sen_HK
dc.contributor.authorNeralla, Sen_HK
dc.contributor.authorKumar, Den_HK
dc.contributor.authorSankar, Jen_HK
dc.contributor.authorLiu, Fen_HK
dc.contributor.authorDuscher, Gen_HK
dc.date.accessioned2010-09-17T10:19:00Z-
dc.date.available2010-09-17T10:19:00Z-
dc.date.issued2006en_HK
dc.identifier.citationMaterials Research Society Symposium Proceedings, 2006, v. 890, p. 189-194en_HK
dc.identifier.issn0272-9172en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91418-
dc.description.abstractThis paper reports our recent work on the improved mechanical properties of alumina thin films with embedded Fe and Ni nanopaiticle 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 lime. 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. © 2006 Materials Research Society.en_HK
dc.languageengen_HK
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.htmlen_HK
dc.relation.ispartofMaterials Research Society Symposium Proceedingsen_HK
dc.subjectAluminaen_HK
dc.subjectIronen_HK
dc.subjectLaser Ablationen_HK
dc.subjectMechanical Propertiesen_HK
dc.subjectThermal Effectsen_HK
dc.subjectThin Filmsen_HK
dc.titleRole of Fe and Ni nanoparticles on mechanical properties of alumina thin films deposited by laser ablationen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLiu, F:fordliu@hku.hken_HK
dc.identifier.authorityLiu, F=rp01358en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-33646433046en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33646433046&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume890en_HK
dc.identifier.spage189en_HK
dc.identifier.epage194en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridYarmolenko, S=6603964746en_HK
dc.identifier.scopusauthoridNeralla, S=13404893200en_HK
dc.identifier.scopusauthoridKumar, D=35418412600en_HK
dc.identifier.scopusauthoridSankar, J=35417557500en_HK
dc.identifier.scopusauthoridLiu, F=11038795100en_HK
dc.identifier.scopusauthoridDuscher, G=7006023463en_HK

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