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    Imaging of Ti0.87O2 nanosheets using scanning tunneling spectroscopy

    Year: 2013

    Journal: APPLIED SURFACE SCIENCE, Vol. 265, p 201-204, 20150703

    Authors: Kumar, Avijit; Palanisamy, Suresh Kumar C.; Boter, Jelmer M.; Hellenthal, Chris; ten Elshof, Johan E.; Zandvliet, Harold J. W.

    Organizations: Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

    We report scanning tunneling microscopy (STM) and spectroscopy (STS) measurements on single layer Ti0.87O2 nanosheets deposited on Pt(200 nm)/Si substrates. These nanosheets have a band gap of 3.8 eV and are virtually invisible in conventional STM images. However, an impressive contrast is observed in the di/dz map, which allows for a clear identification of the nanosheets. The di/dz signal is obtained by adding a high frequency, small amplitude modulation to the z-piezo using a lock-in amplifier. (C) 2012 Elsevier B.V. All rights reserved.