Science Applications International Corporation (SAIC) 1 article published in JoVE Chemistry Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia Jared B. DeCoste1, Gregory W. Peterson2 1Research and Development, Science Applications International Corporation (SAIC), 2Edgewood Chemical Biological Center, Research Development Engineering Command Herein the procedures for plasma enhanced chemical vapor deposition of perfluoroalkanes on microporous materials such as metal-organic frameworks to enhance their stability and hydrophobicity are described. Furthermore, breakthrough testing of milligram quantities of samples is described in detail.