COOH Functionalized Graphitized MWCNTs (>99.9%, OD: 50-80nm)
Graphitized high purity multi-walled carbon nanotubes (MWNTs) were produced by a low temperature CVD method and subsequently annealed about twenty (20) hours under condition of inert gas at temperatures between 1600 and 3000°C. These products were characterized for chemical purity, interlayer spacing, and defect healing. The graphitization procedure was found to remove residual metal catalyst in the nanotubes and reduce the wall defects as reflected in a reduced interlayer spacing between the graphene shells. The graphitized MWNTs have the highest graphite crystallization, the high electrical conductivity and the excellent inoxidizability. The electrical conductivity of the graphitized MWNTs is very close to that of graphite powder. And its ignition temperature can reach 800°C.
| COOH Functionalized Graphitized MWCNTs | |
| Product No | NRE-40003 |
| CAS No. | NA |
| Purity | Carbon nanotubes > 99.9wt% |
| Average Diameter | 50-80 nm |
| Average Length | 10-30 um (TEM) |
| Special Surface Area(SSA) | >20m2/g(BET) |
| Tap Density | NA |
| True Density | 2.1g/cm3 |
| Electric Conductivity | > 100 S/cm |
COOH Functionalized Graphitized MWCNTs Nanotubes
COOH-functionalized graphitized MWCNTs nanotubes combine the enhanced properties of MWCNTs (such as mechanical strength, electrical conductivity, and thermal stability) with the ability to interact more easily with other molecules due to the introduction of carboxyl groups (-COOH) on their surface. This functionalization improves dispersion, reactivity, and the potential for further modification, expanding their applications in a wide range of fields.
Composite Materials
Polymer Nanocomposites: COOH-functionalized MWCNTs are commonly used to reinforce polymer matrices, improving their mechanical properties (such as strength, toughness, and flexibility), electrical conductivity, and thermal stability. The carboxyl groups enhance the interaction between the MWCNTs and polymers, leading to better dispersion and adhesion within the composite material.
Ceramic and Metal Nanocomposites: In composite materials such as metal matrix composites (MMCs) and ceramic matrix composites (CMCs), COOH-functionalized MWCNTs can be used to enhance properties like toughness, heat resistance, and conductivity. The functional groups help with the interfacial bonding between the carbon nanotubes and the matrix, leading to improved mechanical and thermal performance.
Energy Storage Devices
Supercapacitors: COOH-functionalized MWCNTs are often used in supercapacitor electrodes due to their high surface area and conductivity. The carboxyl groups enhance the electrochemical performance, increase charge storage capacity, and improve cycling stability by promoting better dispersion and interaction within the electrode material.
Lithium-Ion Batteries: Functionalized MWCNTs are employed in lithium-ion battery anodes and cathodes. Their ability to conduct electricity, combined with improved dispersion and bonding with the active materials (thanks to the COOH groups), enhances battery performance, including charge/discharge rates and capacity retention.
Fuel Cells: COOH-functionalized MWCNTs can be used as catalyst supports or electrocatalysts in fuel cells, especially in proton-exchange membrane (PEM) fuel cells. The functional groups on the nanotubes improve the dispersion of metal nanoparticles (such as platinum), enhancing catalytic activity for reactions like oxygen reduction and hydrogen oxidation.
Electronics and Sensors
Field-Effect Transistors (FETs): COOH-functionalized MWCNTs are used in the fabrication of carbon nanotube field-effect transistors (CNT-FETs) for nanoelectronics. The carboxyl groups make the MWCNTs more processable and allow them to be integrated into semiconductor devices, potentially replacing silicon in some applications.
Gas Sensors: Functionalized MWCNTs exhibit increased sensitivity to various gases, such as NO₂, CO, and NH₃, due to the surface reactivity of the COOH groups. They are used in gas sensor applications, where the interaction of gas molecules with the carboxylated surface changes the electrical conductivity of the MWCNTs, allowing for detection.
Chemical Sensors: COOH-functionalized MWCNTs can be used for detecting chemicals, biomolecules, or environmental pollutants. The functional groups can be chemically modified to create sensors for specific target molecules, such as detecting volatile organic compounds (VOCs), pH levels, or specific biomarkers in medical diagnostics.
