Evolution of electric field assisted dissolution of nanoparticles investigated by spectroscopic ellipsometry

Okorn, Boris; Sancho-Parramon, Jordi; Pervan, Petar; Fabijanić, Ivana; Janicki, Vesna (2020) Evolution of electric field assisted dissolution of nanoparticles investigated by spectroscopic ellipsometry. Optical Materials, 101 . ISSN 0925-3467

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Abstract

The evolution of electric feld assisted dissolution (EFAD) of nanoparticles process is studied by means of spectroscopic ellipsometry. Multilayer structures with embedded Ag islands flms are prepared by electron beam evaporation and subjected to EFAD process using different voltages and treatment times. Modelling of ellipsometric data evidences the dissolution process by the progressive quenching of the localized surface plasmon resonance of nanoparticles. Further quantitative information is revealed by the analysis of the effective dielectric function of Ag islands films in terms of the spectral density function. The amount of dissolved metal appears to follow a non-linear dependence with the applied voltage. Ag islands become elongated in the film plane as dissolution takes place. In the case of multiple Ag islands films, the process takes place in a sequential way, starting from the film closest to the glass substrate. Accumulation of Ag in a near-surface glass region is revealed by the presence of a refractive index gradient. Overall, the study demonstrates the usefulness of ellipsometry for providing novel insights into the EFAD process.

Item Type:

Article

Uncontrolled Keywords:

electric field assisted dissolution; metal nanoparticles; spectroscopic ellipsometry; localized surface plasmon resonance; refractive index gradient

Subjects:

NATURAL SCIENCES > Physics > Condensed Matter Physics

Divisions:

Division of Materials Physics

Projects:

Project title	Project leader	Project code	Project type
Razlaganje električnim poljem u tankim optičkim slojevima - nanostrukturiranje, dopiranje, porozni slojevi-REPTOSNANODOPS	Vesna Janicki	IP-2016-06-2168	HRZZ

Depositing User:

Vesna Janicki

Date Deposited:

30 Apr 2020 06:45

URI:

http://fulir.irb.hr/id/eprint/5604

DOI:

https://doi.org/10.1016/j.optmat.2020.109752