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Quantitative Hardness Measurement by Instrumented AFM-indentation

Quantitative Hardness Measurement by Instrumented AFM-indentation

Published on: November 22, 2016

Variable temperature thin film indentation with a flat punch.

Graham L W Cross¹, Barry S O'Connell, John B Pethica

¹School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland. graham.cross@tcd.ie

The Review of Scientific Instruments

|February 6, 2008

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Research square·2024

This study introduces instrumented imprint, a novel nanoindentation technique for testing soft materials. It enables precise measurement of mechanical properties in thin films under variable temperatures and large strains.

Area of Science:

Materials Science
Nanotechnology
Polymer Science

Background:

Conventional nanoindentation faces limitations in testing ultrathin films, especially soft matter under variable temperatures.
Characterizing mechanical properties of polymers and soft materials at the nanoscale requires advanced techniques.

Purpose of the Study:

To present modifications to nanoindentation for variable temperature, flat punch indentation of ultrathin films.
To develop a nanomechanics platform for large strain, thin film extrusion, and squeeze flow rheometry.
To enable precise measurement of soft matter properties in confined geometries.

Main Methods:

Utilized modified nanoindentation with flat punch dies (radii as small as 185 nm) for ultrathin polymer films (36 nm).
Implemented a single die-sample system with temperatures from 20 to 125°C and loading rates spanning two decades.

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Introduced a novel directional heat flux measurement for isothermal contact conditions using independent heating and thermometry.

Main Results:

Achieved precise geometries and large strain extrusion, idealizing nanoimprint lithography and squeeze flow rheometry.
Obtained self-consistent compressive stress-strain measurements under various mechanical testing conditions.
Demonstrated precise detection of soft surfaces with standard nanoindenter stiffness sensitivity.

Conclusions:

Instrumented imprint is a new nanomechanics platform for testing polymer and soft matter properties.
The technique extends nanoindentation capabilities to low modulus, low strength glassy and viscoelastic materials.
Ensuring isothermal contact conditions is crucial for interpreting temperature-sensitive soft matter responses.