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    Atomic force microscope adhesion measurements and atomistic molecular dynamics simulations at different humidities

    247899.pdf (921.4Kb)
    Access Status
    Open access
    Authors
    Seppä, J.
    Reischl, Bernhard
    Sairanen, H.
    Korpelainen, V.
    Husu, H.
    Heinonen, M.
    Raiteri, P.
    Rohl, Andrew
    Nordlund, K.
    Lassila, A.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Seppä, J. and Reischl, B. and Sairanen, H. and Korpelainen, V. and Husu, H. and Heinonen, M. and Raiteri, P. et al. 2017. Atomic force microscope adhesion measurements and atomistic molecular dynamics simulations at different humidities. Measurement Science and Technology. 28 (3): Article ID 034004.
    Source Title
    Measurement Science and Technology
    DOI
    10.1088/1361-6501/28/3/034004
    Additional URLs
    http://purl.org/au-research/grants/arc/DP140101776
    http://purl.org/au-research/grants/arc/FT130100463
    ISSN
    1361-6501
    School
    Nanochemistry Research Institute
    Remarks

    This is an author-created, un-copy edited version of an article accepted for publication in Measurement Science and Technology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/1361-6501/28/3/034004

    URI
    http://hdl.handle.net/20.500.11937/4837
    Collection
    • Curtin Research Publications
    Abstract

    Due to their operation principle atomic force microscopes (AFMs) are sensitive to all factors affecting the detected force between the probe and the sample. Relative humidity is an important and often neglected—both in experiments and simulations—factor in the interaction force between AFM probe and sample in air. This paper describes the humidity control system designed and built for the interferometrically traceable metrology AFM (IT-MAFM) at VTT MIKES. The humidity control is based on circulating the air of the AFM enclosure via dryer and humidifier paths with adjustable flow and mixing ratio of dry and humid air. The design humidity range of the system is 20–60 %rh. Force–distance adhesion studies at humidity levels between 25 %rh and 53 %rh are presented and compared to an atomistic molecular dynamics (MD) simulation. The uncertainty level of the thermal noise method implementation used for force constant calibration of the AFM cantilevers is 10 %, being the dominant component of the interaction force measurement uncertainty. Comparing the simulation and the experiment, the primary uncertainties are related to the nominally 7 nm radius and shape of measurement probe apex, possible wear and contamination, and the atomistic simulation technique details. The interaction forces are of the same order of magnitude in simulation and measurement (5 nN). An elongation of a few nanometres of the water meniscus between probe tip and sample, before its rupture, is seen in simulation upon retraction of the tip in higher humidity. This behaviour is also supported by the presented experimental measurement data but the data is insufficient to conclusively verify the quantitative meniscus elongation.

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