Type

Journal Article

Authors

David Corcoran
Arousian Arshak
Colm O'Dwyer
Ian Clancy
George Amarandei

Subjects

Chemistry

Topics
transition temperature glass transition gold nanoparticles surface area polymer nanocomposite polymer films free energy industrial applications

Stability of ultrathin nanocomposite polymer films controlled by the embedding of gold nanoparticles. (2014)

Abstract Thin and ultrathin polymer films combined with nanoparticles (NPs) are of significant interest as they are used in a host of industrial applications. In this paper we describe the stability of such films (hpoly ≤ 30 nm) to dewetting, specifically, how the development of a spinodal instability in a composite NP-polymer layer is controlled by the embedding of Au NPs. At working temperatures (T = 170 °C) above the polymer glass transition temperature (Tg ≈ 100 °C) the absence of Au NPs leads to film rupture by nucleation dewetting, while their presence over a large surface area enhances the development of a spinodal instability without destroying the film continuity. When the NPs embed, the surface undulations are suppressed. The dynamics change from an unstable to a stable state, and the thin composite NP-polymer layer returns to a flat configuration, while the wavelength of the pattern remains constant. Moreover, we demonstrate from a thermodynamic perspective that NPs will remain on the surface or embed in the polymer film depending on their free energy, which is determined by the NP interactions with the underlying polymer, the native SiOx layer, and the Si substrate.
Collections Ireland -> University of Limerick -> PubMed

Full list of authors on original publication

David Corcoran, Arousian Arshak, Colm O'Dwyer, Ian Clancy, George Amarandei

Experts in our system

1
Colm O'Dwyer
University College Cork
Total Publications: 121
 
2
Ian Clancy
University of Limerick
Total Publications: 6
 
3
George Amarandei
University of Limerick
Total Publications: 4