Sampling effects influence heights measured with atomic force microscopy
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Updated: Sep 30, 2026

Quantitative Hardness Measurement by Instrumented AFM-indentation
Published on: November 22, 2016
J B Heymann1, C Möller, D J Müller
1LSBR, NIAMS, National Institutes of Health, 50 South Drive, Bethesda, MD 20892-8025, USA.
Abstract:
The atomic force microscope (AFM) is an exquisitely delicate probe measuring the height of a specimen at discrete sampling points in a fixed two-dimensional (2D) raster. The resulting topograph is a 2D digital image, with each pixel representing a distinct height measurement. The height of an object is determined as the average of the maximum heights measured above the supporting surface. We show that such object heights derived from a variety of organic samples depend critically on the sampling or pixel size of the 2D raster. It is concluded that to obtain accurate specimen heights, the pixel size must be small enough to resolve submolecular structures and thus ensure representative sampling of the height variation on the surface.
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