Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy

Details Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy

2008-12-03

arxiv.org/abs/0812.0690v1

CARBON, Volume: 46, Issue: 11, Pages: 1435-1442, Published: SEP 2008

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1016/j.carbon.2008.06.022

Atomic Force Microscopy (AFM) in the tapping (intermittent contact) mode is a commonly used tool to measure the thickness of graphene and few layer graphene (FLG) flakes on silicon oxide surfaces. It is a convenient tool to quickly determine the thickness of individual FLG films. However, reports from literature show a large variation of the measured thickness of graphene layers. This paper is focused on the imaging mechanism of tapping mode AFM (TAFM) when measuring graphene and FLG thickness and we show that at certain measurement parameters significant deviations can be introduced in the measured thickness of FLG flakes. An increase of as much as 1 nm can be observed in the measured height of FLG crystallites, when using an improperly chosen range of free amplitude values of the tapping cantilever. We present comparative Raman spectroscopy and TAFM measurements on selected single and multilayer graphene films, based on which we suggest ways to correctly measure graphene and FLG thickness using TAFM.

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