%0 Journal Article %T Fast and clean dielectric barrier discharge plasma functionalization of carbon nanotubes decorated by electrodeposited nickel oxide: Application to glucose biosensors %J Scientia Iranica %I Sharif University of Technology %Z 1026-3098 %A Khodadadi, A.A. %A Mortazavi, Y. %A Vesali-Naseh, M. %D 2019 %\ 12/01/2019 %V 26 %N 6 %P 3896-3904 %! Fast and clean dielectric barrier discharge plasma functionalization of carbon nanotubes decorated by electrodeposited nickel oxide: Application to glucose biosensors %K Plasma %K Functional %K carbon nanotubes %K Nickel %K Biosensor %R 10.24200/sci.2019.51666.2302 %X Multi-walled carbon nanotubes (MWCNTs) were functionalized using a dielectric barrier discharge plasma in presence of H2O-saturated air at 70˚C and atmospheric pressure. The functionalized MWCNTs (F-CNTs) were decorated with electrochemically deposited 10 nm NiO nanoparticles, followed by immobilization of glucose oxidase (GOx) and the modified electrode was utilized for electrochemical detection of glucose. TEM, FE-SEM, TPD and XPS techniques were used to characterize the NiO/F-CNTs samples. The maximum amount of oxygenated functional groups such as carbonyl, hydroxyl and carboxylic groups was formed at the plasma exposure time of 4 min. The optimum chronoamperometric deposition time of NiO was 3 min. The presence of GOx on the NiO/F-CNTs electrode displayed a quasi-reversible and surface-controlled redox wave around −0.52 V with a peak to peak separation of 0.05 V. The GOx/NiO/F-CNTs electrode showed a linear performance in the range of 0.2-3.8 mM glucose with detection limit of 93.0 µM and sensitivity of 2.16 µA.mM−1. %U https://scientiairanica.sharif.edu/article_21441_4fe637b3e682568055d978e9f8e8b238.pdf