Substrate samples (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Transmission electron microscope (TEM) images of the new 2D nanosheet as a barrier coating that self-assembles on a variety of substrates including a Teflon beaker and membrane, polyester film, thick and thin silicon films, and glass. The TEM experiments were conducted at UC Berkeley’s Electron Microscopy Laboratory. Credit Emma Vargo et al./Berkeley Lab. Images courtesy of Nature. Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.