Current Status and Future Challenges for Teacher Training for ESD

STEM micrographs of 99% ¹³C graphene imaged with electrons accelerated by a voltage of 100 kV. Each item in the fileset is a ZIP archive containing a single time series of consecutive frames recorded with a medium angle annular dark field detector until an ejection was observed

Probing from Both Sides: Reshaping the Graphene Landscape via Face-to-Face Dual-Probe Microscopy

In two-dimensional samples, all atoms are at the surface and thereby exposed for probing and manipulation by physical or chemical means from both sides. Here, we show that we can access the same point on both surfaces of a few-layer graphene membrane simultaneously, using a dual-probe scanning tunneling microscopy (STM) setup. At the closest point, the two probes are separated only by the thickness of the graphene membrane. This allows us for the first time to directly measure the deformations induced by one STM probe on a free-standing membrane with an independent second probe. We reveal different regimes of stability of few-layer graphene and show how the STM probes can be used as tools to shape the membrane in a controlled manner. Our work opens new avenues for the study of mechanical and electronic properties of two-dimensional materials

12C graphene, 100 kV

STEM micrographs of 99% ¹²C graphene imaged with electrons accelerated by a voltage of 100 kV. Each item in the fileset is a ZIP archive containing a single time series of consecutive frames recorded with a medium angle annular dark field detector until an ejection was observed.<br

13C graphene, 90 kV

STEM micrographs of 99% ¹³C graphene imaged with electrons accelerated by a voltage of 90 kV. Each item in the fileset is a ZIP archive containing a single time series of consecutive frames recorded with a medium angle annular dark field detector until an ejection was observed

12C graphene, 95 kV

STEM micrographs of 99% ¹²C graphene imaged with electrons accelerated by a voltage of 95 kV. Each item in the fileset is a ZIP archive containing a single time series of consecutive frames recorded with a medium angle annular dark field detector until an ejection was observed.<br