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Electric field screening in atomically thin layers of MoS2: the role of interlayer coupling
Andres Castellanos-Gomez, Emmanuele Cappelluti, Rafael Roldán +3
The aim of this work is to study the electrostatic screening by single and few-layer MoS2 sheets by means of electrostatic force microscopy in combination with a non-linear Thomas-…
A simple strobe to study high-order harmonics and multifrequency oscillations in mechanical resonators
Andres Castellanos-Gomez
A simple strobe setup with potential to study higher-order eigenmodes and multifrequency oscillations in micromechanical resonators is described. It requires standard equipment, co…
Electronic inhomogeneities in graphene: the role of the substrate interaction and chemical doping
A. Castellanos-Gomez, Arramel, M. Wojtaszek +5
We probe the local inhomogeneities of the electronic properties of graphene at the nanoscale using scanning probe microscopy techniques. First, we focus on the study of the electro…
Highly reproducible low temperature scanning tunnelling microscopy and spectroscopy with in situ prepared tips
Andres Castellanos-Gomez, Gabino Rubio-Bollinger, Manuela Garnica +4
An in situ tip preparation procedure compatible with ultra-low temperature and high magnetic field scanning tunneling microscopes is presented. This procedure does not require addi…
Mechanical properties of freely suspended atomically thin dielectric layers of mica
Andres Castellanos-Gomez, Menno Poot, Albert Amor-Amorós +4
We have studied the elastic deformation of freely suspended atomically thin sheets of muscovite mica, a widely used electrical insulator in its bulk form. Using an atomic force mic…
Laser-thinning of MoS2: on demand generation of a single-layer semiconductor
Andres Castellanos-Gomez, Maria Barkelid, Stijn M. Goossens +3
Single-layer MoS2 is an attractive semiconducting analogue of graphene that combines high mechanical flexibility with a large direct bandgap of 1.8 eV. On the other hand, bulk MoS2…
Carbon-fiber tips for scanning probe microscopes and molecular electronics experiments
Gabino Rubio-Bollinger, Andres Castellanos-Gomez, Stefan Bilan +4
We fabricate and characterize carbon-fiber tips for their use in combined scanning tunneling and force microscopy based on piezoelectric quartz tuning fork force sensors. An electr…
Mechanical properties of freely suspended semiconducting graphene-like layers based on MoS2
Andres Castellanos-Gomez, Menno Poot, Gary A. Steele +3
We fabricate freely suspended nanosheets of MoS2 which are characterized by quantitative optical microscopy and high resolution friction force microscopy. We study the elastic defo…
Reversible hydrogenation and band gap opening of graphene and graphite surfaces probed by scanning tunneling spectroscopy
Andres Castellanos-Gomez, Magdalena Wojtaszek, Arramel +2
The effect of hydrogenation on the topography and the electronic properties of graphene and graphite surfaces are studied by scanning tunneling microscopy and spectroscopy. The sur…
Calibration of piezoelectric positioning actuators using a reference voltage-to-displacement transducer based on quartz tuning forks
Andres Castellanos-Gomez, Carlos R. Arroyo, Nicolás Agraït +1
We use a piezoelectric quartz tuning fork to calibrate the displacement of ceramic piezoelectric scanners which are widely employed in scanning probe microscopy. We measure the sta…
Elastic properties of freely suspended MoS2 nanosheets
Andres Castellanos-Gomez, Menno Poot, Gary A. Steele +3
We study the elastic deformation of few layers (5 to 25) thick freely suspended MoS2 nanosheets by means of a nanoscopic version of a bending test experiment, carried out with the…