Detail publikace

The critical influence of surface topography on nanoindentation measurements of a-SiC:H films

ČECH, V. LASOTA, T. PÁLESCH, E. LUKEŠ, J.

Originální název

The critical influence of surface topography on nanoindentation measurements of a-SiC:H films

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Hydrogenated amorphous silicon-carbon films were prepared on polished silicon wafers from a tetravinylsilane precursor via plasma-enhanced chemical vapor deposition. The grain structure was developed at the film surface using high powers (50-70 W), as observed by atomic force microscopy (AFM). Conventional and cyclic nanoindentation measurements revealed different mechanical responses for indentation into and outside of the selected isolated grain with a spherical cap geometry with a radius greater than that of the indenter (50 nm). The finite element method was employed to simulate the behavior of the grain under deformation by an indenter to correctly interpret the nanoindentation data. Scanning probe measurements using modulus mapping (dynamic mechanical analysis) and atomic force acoustic microscopy confirmed that the surface topography had a critical influence on the determined mechanical properties, which were significantly underestimated. Our experimental and simulation study demonstrates that nanoindentation and scanning probe measurements must be performed on strictly flat surfaces. This conclusion applies to all AFM measurements performed in contact and semi-contact mode used to characterize mechanical properties based on the geometry of the contact.

Klíčová slova

Thin films; Nanoindentation; Modulus mapping; Atomic force acoustic microscopy; Finite element method.

Autoři

ČECH, V.; LASOTA, T.; PÁLESCH, E.; LUKEŠ, J.

Rok RIV

2015

Vydáno

15. 1. 2015

ISSN

0257-8972

Periodikum

Surface and Coatings Technology

Ročník

261

Číslo

1

Stát

Švýcarská konfederace

Strany od

114

Strany do

121

Strany počet

8

URL

http://www.sciencedirect.com/science/article/pii/S0257897214010706

BibTex

@article{BUT117326,
  author="Vladimír {Čech} and Tomáš {Lasota} and Erik {Pálesch} and Jaroslav {Lukeš}",
  title="The critical influence of surface topography on nanoindentation measurements of a-SiC:H films",
  journal="Surface and Coatings Technology",
  year="2015",
  volume="261",
  number="1",
  pages="114--121",
  doi="10.1016/j.surfcoat.2014.11.049",
  issn="0257-8972",
  url="http://www.sciencedirect.com/science/article/pii/S0257897214010706"
}