Double-Walled Carbon Nanotubes

Multi-Walled Carbon Nanotubes (DWNTs) are cylindrical coaxial nanoscale structures of graphitic carbon grown via various chemical vapor deposition (CVD) techniques. These nanotubes consist of two concentric single-walled carbon nanotubes (SWNTs); their additional outer shells give DWNTs unique electronic and optical properties versus SWNTs and higher chemical resistivity.

Applications:

Electronics and Nanoelectronics

Transistors: Multi-walled carbon nanotubes can be used to create nanoscale transistors with excellent electronic properties. Their ability to conduct electricity efficiently, coupled with the tunable electronic properties of their inner and outer tubes, makes them ideal for use in nano electronic circuits.

Conductive Interconnects: Due to their high conductivity, double-walled carbon nanotubes can serve as interconnects in advanced integrated circuits (ICs), replacing traditional copper or aluminum interconnects, which are becoming less effective at nanoscale dimensions.

Flexible Electronics: The mechanical flexibility and high conductivity of DWNTs make them suitable for flexible electronic devices, such as bendable displays, wearable electronics, and transparent conductive films.

Sensors: Multi-walled carbon nanotubes are used in chemical sensors and biosensors due to their large surface area and ability to functionalize the surfaces of the inner and outer tubes. They can detect a variety of gases and biomolecules, making them useful in environmental monitoring, health diagnostics, and security applications.

Energy Storage and Conversion

Supercapacitors: The high surface area and electrical conductivity of make them ideal materials for use in supercapacitors. They can serve as electrode materials, providing high capacitance and fast charge/discharge times.

Batteries: Multi-walled carbon nanotubes are also being explored as anode materials in lithium-ion batteries and sodium-ion batteries. Their high conductivity and structural stability can lead to improved battery performance, including higher energy density and longer cycle life.

Fuel Cells: Due to their electrocatalytic properties, double-walled carbon nanotubes are being investigated for use as electrode materials in fuel cells. They help improve the efficiency of reactions like oxygen reduction and hydrogen oxidation in hydrogen fuel cells.