Graphene (GP) and Carbon nanotubes (CNTs) are the up-to-theminute materials used presently in the nanoscience and nanotechnology field. These nanomaterial’s are attractive materials in electrochemistry and fascinated strong scientific, technological interest in the recent years because of having high thermal conductivity, more surface area and having outstanding ability to mediate fast electron transfer kinetics for a wide range of electro active species these property made these nanomaterial's in wide applications, specifically in the Biosensors and Pharmaceutical drug sensors (electrochemical sensors) fields. In general CNTs classified in to SWCNTs (Single), DWCNTs (Double), MWCNTs (Multiwalled) and there is a new category called functionalized CNTs based on the structures. Similarly the Graphene and Graphene Oxide are hottest materials in the nanotechnology field due to their excellent chemical properties.