Carboxylic multi-walled carbon nanotubes are widely used in various advanced applications due to their unique properties. In the field of electronics, they serve as conductive additives in composite materials, enhancing the electrical conductivity of polymers and coatings. They are also utilized in energy storage devices, such as supercapacitors and lithium-ion batteries, where they improve electrode performance by providing a high surface area and efficient charge transfer.

In biomedical applications, these nanotubes are employed for drug delivery systems due to their ability to functionalize with therapeutic agents and target specific cells or tissues. They are also explored in biosensors for detecting biomolecules with high sensitivity. Additionally, they are used in environmental applications, such as water purification, where they act as adsorbents for removing heavy metals and organic pollutants.

In materials science, carboxylic multi-walled carbon nanotubes are incorporated into nanocomposites to enhance mechanical strength, thermal stability, and durability. They are also used in catalytic processes, where their functionalized surfaces facilitate chemical reactions. Overall, their versatility makes them valuable in cutting-edge research and industrial applications.