Single-pulse transformation of Ag thin film into nanoparticles via laser-induced dewetting

Yoonseok Oh, Myeongkyu Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this study, we show that Ag thin films deposited on glass can be transformed into nanoparticles by laser-induced dewetting using a nanosecond-pulsed Nd:YAG laser. The film could be completely dewetted by a single pulse and the pulse energy density required for a 10 nm-thick Ag film was 86 mJ/cm2 at λ = 1064 nm. This made it possible to dewet a film area of ∼10 cm2 by a single pulse with energy of 850 mJ. The produced particles exhibited a monomodal size distribution and the mean particle size increased as the initial film thickness increased. Repeated exposure to pulses induced no noticeable change in the particle size distribution. The initial film thickness was the only factor that determined the mean particle size. The absorption spectra of dewetted films were well consistent with the surface plasma resonance behaviors of metal nanoparticles. This process provides a facile and scalable method of forming metal nanoparticle arrays for plasmonic and other applications.

Original languageEnglish
Pages (from-to)555-564
Number of pages10
JournalApplied Surface Science
Volume399
DOIs
Publication statusPublished - 2017 Mar 31

Fingerprint

Nanoparticles
Thin films
Lasers
Metal nanoparticles
Film thickness
Particle size
Particle size analysis
Absorption spectra
Plasmas
Glass

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

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abstract = "In this study, we show that Ag thin films deposited on glass can be transformed into nanoparticles by laser-induced dewetting using a nanosecond-pulsed Nd:YAG laser. The film could be completely dewetted by a single pulse and the pulse energy density required for a 10 nm-thick Ag film was 86 mJ/cm2 at λ = 1064 nm. This made it possible to dewet a film area of ∼10 cm2 by a single pulse with energy of 850 mJ. The produced particles exhibited a monomodal size distribution and the mean particle size increased as the initial film thickness increased. Repeated exposure to pulses induced no noticeable change in the particle size distribution. The initial film thickness was the only factor that determined the mean particle size. The absorption spectra of dewetted films were well consistent with the surface plasma resonance behaviors of metal nanoparticles. This process provides a facile and scalable method of forming metal nanoparticle arrays for plasmonic and other applications.",
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Single-pulse transformation of Ag thin film into nanoparticles via laser-induced dewetting. / Oh, Yoonseok; Lee, Myeongkyu.

In: Applied Surface Science, Vol. 399, 31.03.2017, p. 555-564.

Research output: Contribution to journalArticle

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