Opportunities of Highly Oxidized Single-Walled Carbon Nanotubes for Electrochemical and Electromechanical...

One-dimensional single-walled carbon nanotubes (SWCNTs) are strong candidates for providing highly conductive networks in electrodes. However, SWCNTs tend to aggregate in liquid or solid media due to their high aspect ratio and hydrophobic characteristics. This review summarizes recent developments in highly oxidized SWCNTs and their applications in electrical and electrochemical devices. Highly oxidized SWCNTs (Ox-SWCNTs) represent an emerging class of functional carbon nanomaterials in which a high density of oxygenated surface groups is introduced while largely preserving the intrinsic sp²-hybridized framework. Recent advances in chlorate-based oxidation, mechanochemical kneading, and subsequent defect-healing treatments now enable precise control over oxidation chemistry with minimal structural degradation. These developments provide dispersant-free, solution-processable SWCNTs that exhibit enhanced interfacial compatibility and tunable chemical reactivity. Their applications in wet spinning of conducting fibers, textile supercapacitors, chemical sensors, triboelectric devices, and Si/nanocarbon hybrid anodes for Li-ion batteries are introduced. Highly functionalized SWCNTs could serve as a scalable and environmentally responsible materials platform, with applicability extending from catalysis and sensing to advanced battery technologies and flexible electronics.