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CNTs are cylindrical nanomaterials that consist of rolled‐up sheets of graphene (single‐layer carbon atoms). Depending on their structure CNTs can be divided into two types, namely single‐walled carbon nanotubes (SWCNTs) (Figure 1.1f), which usually have diameter of less than 1 nm, and multi‐walled carbon nanotubes (MWCNTs) (Figure 1.1g), which are composed of many concentrically interlinked nanotubes, usually having a diameter size of more than 100 nm (Hsu and Luo 2019). CNTs are considered as one of the stiffest and strongest fibers having novel exceptional characteristics and a unique physicochemical framework, which makes them suitable candidates for efficient delivery of different therapeutic drugs/molecules for various biomedical applications (Vengurlekar and Chaturvedi 2019). Figure 1.1 represents the schematic illustration of various inorganic nanomaterials.