Broad modulus range nanomechanical mapping by magnetic-drive soft probes

Xianghe Meng, Hao Zhang, Jianmin Song, Xinjian Fan, Lining Sun and Hui Xie ()
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Xianghe Meng: Harbin Institute of Technology
Hao Zhang: Harbin Institute of Technology
Jianmin Song: Harbin Institute of Technology
Xinjian Fan: Harbin Institute of Technology
Lining Sun: Harbin Institute of Technology
Hui Xie: Harbin Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Stiffness matching between the probe and deformed portion of the sample in piezo-drive peak force modulation atomic force microscopy (AFM) limits the modulus measurement range of single probes. Here we develop a magnetic drive peak force modulation AFM to broaden the dynamic range of the probe with direct cantilever excitation. This approach not only successfully drives the softest commercial probe (6 pN nm−1) for mapping extremely soft samples in liquid but also provides an indentation force of hundreds of nanonewtons for stiff samples with a soft probe. Features of direct measurements of the indentation force and depth can unify the elastic modulus range up to four orders of magnitude, from 1 kPa to 10 MPa (in liquid) and 1 MPa to 20 GPa (in air or liquid) using a single probe. This approach can be particularly useful for analysing heterogeneous samples with large elastic modulus variations in multi-environments.

Date: 2017
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DOI: 10.1038/s41467-017-02032-y

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