Simultaneous Current, Force and Dissipation Measurements on the Si(111) 7×7 Surface with an Optimized QPlus AFM/STM Technique

Overview

Journal Beilstein J Nanotechnol

Specialty Biotechnology

Date 2012 Apr 13

PMID 22496998

Citations 10

Authors

Zsolt Majzik

Martin Setvin

Andreas Bettac

Albrecht Feltz

Vladimir Chab

Pavel Jelinek

Affiliations

Soon will be listed here.

Abstract

We present the results of simultaneous scanning-tunneling and frequency-modulated dynamic atomic force microscopy measurements with a qPlus setup. The qPlus sensor is a purely electrical sensor based on a quartz tuning fork. If both the tunneling current and the force signal are to be measured at the tip, a cross-talk of the tunneling current with the force signal can easily occur. The origin and general features of the capacitive cross-talk will be discussed in detail in this contribution. Furthermore, we describe an experimental setup that improves the level of decoupling between the tunneling-current and the deflection signal. The efficiency of this experimental setup is demonstrated through topography and site-specific force/tunneling-spectroscopy measurements on the Si(111) 7×7 surface. The results show an excellent agreement with previously reported data measured by optical interferometric deflection.

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