Phenomenological understanding of dewetting and embedding of noble metal nanoparticles in thin films induced by ion irradiation

Title
Phenomenological understanding of dewetting and embedding of noble metal nanoparticles in thin films induced by ion irradiation
Authors
Jai PrakashA. Tripathi가우탐채근화송종한V. RigatoJalaj TripathiK. Asokan
Keywords
Thin films; Irradiation effects; Nanostructures; Interface; Thermodynamic properties; Electron microscopy (SEM and TEM)
Issue Date
2014-10
Publisher
Materials chemistry and physics
Citation
VOL 147, NO 3, 920-924
Abstract
The present experimental work provides the phenomenological approach to understand the dewetting in thin noble metal films with subsequent formation of nanoparticles (NPs) and embedding of NPs induced by ion irradiation. Au/polyethyleneterepthlate (PET) bilayers were irradiated with 150 keV Ar ions at varying fluences and were studied using scanning electron microscopy (SEM) and cross-sectional transmission electron microscopy (X-TEM). Thin Au film begins to dewet from the substrate after irradiation and subsequent irradiation results in spherical nanoparticles on the surface that at a fluence of 5 × 1016 ions/cm2 become embedded into the substrate. In addition to dewetting in thin films, synthesis and embedding of metal NPs by ion irradiation, the present article explores fundamental thermodynamic principles that govern these events systematically under the effect of irradiation. The results are explained on the basis of ion induced sputtering, thermal spike inducing local melting and of thermodynamic driving forces by minimization of the system free energy where contributions of surface and interfacial energies are considered with subsequent ion induced viscous flow in substrate.
URI
http://pubs.kist.re.kr/handle/201004/48631
ISSN
02540584
Appears in Collections:
KIST Publication > Article
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