Kavli Energy NanoScience Institute 1 article published in JoVE Chemistry Using Graphene Liquid Cell Transmission Electron Microscopy to Study in Situ Nanocrystal Etching Matthew R. Hauwiller1, Justin C. Ondry1, A. Paul Alivisatos1,2,3,4 1Department of Chemistry, University of California-Berkeley, 2Department of Material Science and Engineering, University of California-Berkeley, 3Kavli Energy NanoScience Institute, 4Materials Sciences Division, Lawrence Berkeley National Laboratory Graphene liquid cell electron microscopy can be used to observe nanocrystal dynamics in a liquid environment with greater spatial resolution than other liquid cell electron microscopy techniques. Etching premade nanocrystals and following their shape using graphene liquid cell Transmission Electron Microscopy can yield important mechanistic information about nanoparticle transformations.