Formation of aggregated nanoparticle spheres through femtosecond laser surface processing

Alfred T. Tsubaki, Mark A. Koten, Michael J. Lucis, Craig Zuhlke, Natale Ianno, Jeffrey E. Shield, Dennis R Alexander

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A detailed structural and chemical analysis of a class of self-organized surface structures, termed aggregated nanoparticle spheres (AN-spheres), created using femtosecond laser surface processing (FLSP) on silicon, silicon carbide, and aluminum is reported in this paper. AN-spheres are spherical microstructures that are 20–100 μm in diameter and are composed entirely of nanoparticles produced during femtosecond laser ablation of material. AN-spheres have an onion-like layered morphology resulting from the build-up of nanoparticle layers over multiple passes of the laser beam. The material properties and chemical composition of the AN-spheres are presented in this paper based on scanning electron microscopy (SEM), focused ion beam (FIB) milling, transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDX) analysis. There is a distinct difference in the density of nanoparticles between concentric rings of the onion-like morphology of the AN-sphere. Layers of high-density form when the laser sinters nanoparticles together and low-density layers form when nanoparticles redeposit while the laser ablates areas surrounding the AN-sphere. The dynamic nature of femtosecond laser ablation creates a variety of nanoparticles that make-up the AN-spheres including Si/C core-shell, nanoparticles that directly fragmented from the base material, nanoparticles with carbon shells that retarded oxidation, and amorphous, fully oxidized nanoparticles.

Original languageEnglish (US)
Pages (from-to)778-787
Number of pages10
JournalApplied Surface Science
Volume419
DOIs
StatePublished - Oct 15 2017

Fingerprint

Ultrashort pulses
Nanoparticles
Processing
Laser ablation
Lasers
Focused ion beams
Silicon
Aluminum
Chemical analysis
Silicon carbide
Structural analysis
Surface structure
Laser beams
Materials properties

Keywords

  • Core-shell
  • Femtosecond laser
  • Laser processing
  • Nanoparticle aggregates
  • Onion-like

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Formation of aggregated nanoparticle spheres through femtosecond laser surface processing. / Tsubaki, Alfred T.; Koten, Mark A.; Lucis, Michael J.; Zuhlke, Craig; Ianno, Natale; Shield, Jeffrey E.; Alexander, Dennis R.

In: Applied Surface Science, Vol. 419, 15.10.2017, p. 778-787.

Research output: Contribution to journalArticle

Tsubaki, Alfred T. ; Koten, Mark A. ; Lucis, Michael J. ; Zuhlke, Craig ; Ianno, Natale ; Shield, Jeffrey E. ; Alexander, Dennis R. / Formation of aggregated nanoparticle spheres through femtosecond laser surface processing. In: Applied Surface Science. 2017 ; Vol. 419. pp. 778-787.
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