Interface of Nanoparticle-Coated
Electropolished Stents
Posted on 2012-08-21 - 00:00
Nanostructures entail a high potential for improving
implant surfaces,
for instance, in stent applications. The electrophoretic deposition
of laser-generated colloidal nanoparticles is an appropriate tool
for creating large-area nanostructures on surfaces. Until now, the
bonding and characteristics of the interface between deposited nanoparticles
and the substrate surface has not been known. It is investigated using
X-ray photoelectron spectroscopy, Auger electron spectroscopy, and
transmission electron microscopy to characterize an electropolished
NiTi stent surface coated by laser-generated Au and Ti nanoparticles.
The deposition of elemental Au and Ti nanoparticles is observed on
the total 3D surface. Ti-coated samples are composed of Ti oxide and
Ti carbide because of nanoparticle fabrication and the coating process
carried out in 2-propanol. The interface between nanoparticles and
the electropolished surface consists of a smooth, monotone elemental
depth profile. The interface depth is higher for the Ti nanoparticle
coating than for the Au nanoparticle coating. This smooth depth gradient
of Ti across the coating–substrate intersection and the thicker
interface layer indicate the hard bonding of Ti-based nanoparticles
on the surface. Accordingly, electron microscopy reveals nanoparticles
adsorbed on the surface without any sorption-blocking intermediate
layer. The physicomechanical stability of the bond may benefit from
such smooth depth gradients and direct, ligand-free contact. This
would potentially increase the coating stability during stent application.
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Neumeister, Anne; Bartke, Daniel; Bärsch, Niko; Weingärtner, Tobias; Guetaz, Laure; Montani, Alexandre; et al. (2016). Interface of Nanoparticle-Coated
Electropolished Stents. ACS Publications. Collection. https://doi.org/10.1021/la300308w
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AUTHORS (8)
AN
Anne Neumeister
DB
Daniel Bartke
NB
Niko Bärsch
TW
Tobias Weingärtner
LG
Laure Guetaz
AM
Alexandre Montani
GC
Giuseppe Compagnini
SB
Stephan Barcikowski