 Emzines are a class of two-dimensional layered materials composed of transition metals and oxygen atoms. They have been attracting increasing interest due to their wide range of applications from catalysis to electronics. This review provides an overview of the unique properties of emzine quantum dots, QDs, their synthesis methods, and recent developments in their use in electrochemical sensors, biomedicine, and energy conversion in storage. This article was authored by Cerega and Mariela Babu, Shashi Kumar SV, and others.