Assembly of tantalum porous films with graded oxidation profile from size-selected nanoparticles

Singh, VidyadharOkinawa Institute of Science and Technology Graduate University, JPN (författare)

Functionally graded materials offer a way to improve the physical and chemical properties of thin films and coatings for different applications in the nanotechnology and biomedical fields. In this work, design and assembly of nanoporous tantalum films with a graded oxidation profile perpendicular to the substrate surface are reported. These nanoporous films are composed of size-selected, amorphous tantalum nanoparticles, deposited using a gas-aggregated magnetron sputtering system, and oxidized after coalescence, as samples evolve from mono- to multi-layered structures. Molecular dynamics computer simulations shed light on atomistic mechanisms of nanoparticle coalescence, which govern the films porosity. Aberration-corrected (S) TEM, GIXRD, AFM, SEM, and XPS were employed to study the morphology, phase and oxidation profiles of the tantalum nanoparticles, and the resultant films. Design and assembly of tantalum nanoparticle porous films with a graded oxidation profile perpendicular to the substrate surface were fabricated by magnetron-sputter inert-gas aggregation system. At the top-most layers of the film, the larger free-surface areas of nanoparticles enable the formation of thermodynamically stable Ta2O5.

Grammatikopoulos, PanagiotisOkinawa Institute of Science and Technology Graduate University, JPN (författare)
Cassidy, CathalOkinawa Institute of Science and Technology Graduate University, JPN (författare)
Benelmekki, MariaOkinawa Institute of Science and Technology Graduate University, JPN (författare)
Bohra, MurtazaOkinawa Institute of Science and Technology Graduate University, JPN (författare)
Hawash, ZaferOkinawa Institute of Science and Technology Graduate University, JPN(Swepub:kau)zafehawa (författare)
Baughman, Kenneth W.Okinawa Institute of Science and Technology Graduate University, JPN (författare)
Sowwan, MukhlesOkinawa Institute of Science and Technology Graduate University, JPN;Al-Quds University, ISR (författare)
Okinawa Institute of Science and Technology Graduate University, JPNOkinawa Institute of Science and Technology Graduate University, JPN;Al-Quds University, ISR (creator_code:org_t)

Ingår i:Journal of nanoparticle research: Springer Science and Business Media LLC16:51388-07641572-896X

Av författaren/redakt...: Singh, Vidyadhar; Grammatikopoulos ...; Cassidy, Cathal; Benelmekki, Mari ...; Bohra, Murtaza; Hawash, Zafer; visa fler...; Baughman, Kennet ...; Sowwan, Mukhles; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.