Multiwalled carbon nanotubes Multiwalled carbon nanotubes (MWCN) 6 Amines 4 Carbon nanotubes 4 Fourier transform infrared spectroscopy 4 Scanning electron microscopy 4 Spectroscopic analysis 4 Surface modification 4 Ultraviolet spectroscopy 4 AFM 2 Acid treatments 2 Amine 2 Amine functionalization 2 Amine groups 2 Anodic oxidation 2 Ascorbic acid 2 Atomic force microscopy 2 Atomic spectroscopy 2 Biodegradable polyol 2 Caprolactone 2 Carboxylic group 2 Chemical detection 2 Chemical structure 2 Cyclic voltammetry 2 Different solvents 2 Dopamine 2 Electrochemical determination 2 Electrochemical impedance spectroscopy 2 Electrochemical techniques 2 Electrochemical treatment 2