Exploring Two-Dimensional Empty Space.

  title={Exploring Two-Dimensional Empty Space.},
  author={Andre K. Geim},
  journal={Nano letters},
  • A. Geim
  • Published 2021
  • Physics, Medicine
  • Nano letters
The advent of graphene and other two-dimensional (2D) crystals1 has given rise to one of the most active research fields in condensed matter physics and materials science. While the properties of graphene per se had largely been explored within the first few years after its isolation, the field has not withered away but instead continued to expand, with new topics emerging seemingly from nowhere every couple of years. After graphene, it was the turn of other atomically thin materials like 2D… Expand

Figures from this paper

Physical Origin of Dual-Emission of Au–Ag Bimetallic Nanoclusters
  • Bo Peng, Liu-Xi Zheng, +5 authors Kun Zhang
  • Medicine
  • Frontiers in Chemistry
  • 2021
The results provide a completely new insight on the understanding of the origin of photoluminescence of metal NCs, which elucidates the abnormal PL emission phenomena, including solvent effect, pH-dependent behavior, surface ligand effect, multiple emitter centers, and large-Stoke’s shift. Expand


Van der Waals heterostructures
With steady improvement in fabrication techniques and using graphene’s springboard, van der Waals heterostructures should develop into a large field of their own. Expand
Molecular transport through capillaries made with atomic-scale precision
This work reports the fabrication of narrow and smooth capillaries through van der Waals assembly, with atomically flat sheets at the top and bottom separated by spacers made of two-dimensional crystals with a precisely controlled number of layers, using graphene and its multilayers as archetypalTwo-dimensional materials to demonstrate this technology. Expand
Ballistic molecular transport through two-dimensional channels
The results provide insights into the atomistic details of molecular permeation, which previously could be accessed only in simulations, and demonstrate the possibility of studying gas transport under controlled confinement comparable in size to the quantum-mechanical size of atoms. Expand
Size effect in ion transport through angstrom-scale slits
This work reports ion transport through ultimately narrow slits that are fabricated by effectively removing a single atomic plane from a bulk crystal, and finds that ions with hydrated diameters larger than the slit size can still permeate through, albeit with reduced mobility. Expand
Complete steric exclusion of ions and proton transport through confined monolayer water
Water moves through capillaries made by effectively extracting one atomic plane from bulk crystals, which leaves a two-dimensional slit of a few angstroms in height, whereas no permeation could be detected even for such small ions as Na+ and Cl−. Expand
Two-dimensional atomic crystals.
By using micromechanical cleavage, a variety of 2D crystals including single layers of boron nitride, graphite, several dichalcogenides, and complex oxides are prepared and studied. Expand
Anomalously low dielectric constant of confined water
Capacitance measurements reveal a low dielectric constant for atomically thin layers of water next to solid surfaces and reveal the presence of an interfacial layer with vanishingly small polarization such that its out-of-plane ε is only ~2, while the electrically dead layer is found to be two to three molecules thick. Expand
Capillary condensation under atomic-scale confinement.
Surprisingly, even at this scale, the macroscopic Kelvin equation using the characteristics of bulk water describes the condensation transition accurately in strongly hydrophilic capillaries and remains qualitatively valid for weakly Hydrophilic (graphite) ones. Expand
[Et al].