TY - JOUR
T1 - Formation of aggregated nanoparticle spheres through femtosecond laser surface processing
AU - Tsubaki, Alfred T.
AU - Koten, Mark A.
AU - Lucis, Michael J.
AU - Zuhlke, Craig
AU - Ianno, Natale
AU - Shield, Jeffrey E.
AU - Alexander, Dennis R.
N1 - Funding Information:
This work was supported by National Aeronautics and Space Administration (NASA)Experimental Program to Stimulate Competitive Research (EPSCoR) Grant #NNX13AB17A and the Office of Naval Research (ONR) Contract #FA4600-12-D-9000-0045. Research was performed in the facilities of the Nebraska Center for Materials and Nanoscience (NCMN) and Nano-Engineering Research Core Facility (NERcF), which are supported by the Nebraska Research Initiative.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - 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.
AB - 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.
KW - Core-shell
KW - Femtosecond laser
KW - Laser processing
KW - Nanoparticle aggregates
KW - Onion-like
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U2 - 10.1016/j.apsusc.2017.05.094
DO - 10.1016/j.apsusc.2017.05.094
M3 - Article
C2 - 30410204
AN - SCOPUS:85019559477
VL - 419
SP - 778
EP - 787
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -