Ariyanti, W. and Kasmui, K. 2021. Effect of Cobalt Metal Insertion on Zinc Oxide Nanotube Structure for Hydrogen Gas Sensor Using Density Functional Theory Method. Indonesian Journal of Chemical Science. 10, 2 (Sep. 2021), 108-117. DOI:https://doi.org/10.15294/ijcs.v10i2.49534.