Fig. 6From: An Overview on Recent Progress of Metal Oxide/Graphene/CNTs-Based NanobiosensorsThe classification of the CNTs of a SWCNT, b MWCNT; Schematic representation of three typical types of SWCNTs c Armchair (10, 10), d Chiral (13, 6), and e Zigzag (14, 0)Back to article page