Carbon Nanofibers, Purity: > 95%, Outside Diameter: 50-100 nm

Frequently Asked Questions About Carbon Nanofibers (CNFs)

1. What are carbon nanofibers used for?

Carbon nanofibers (CNFs) are investigated for polymer reinforcement, electrically conductive composites, energy storage electrodes, sensors, and catalyst supports. Their elongated carbon structure can help form conductive networks and reinforce selected materials. The performance of carbon nanofibers depends on their morphology, dispersion, surface chemistry, and compatibility with the surrounding matrix. Researchers can explore NANOGRAFi's Carbon Nanofibers collection for alternative grades.

2. What is the difference between carbon nanofibers and carbon nanotubes?

Carbon nanofibers and carbon nanotubes (CNTs) are both elongated carbon nanomaterials, but they differ in their internal graphitic structure and morphology. CNTs typically consist of concentric or single cylindrical graphene walls, while CNFs can exhibit stacked-cup, platelet, or other graphitic arrangements. These differences influence surface chemistry, mechanical behavior, and electrical properties. For applications requiring alternative structures, researchers can compare Multi-Walled Carbon Nanotubes (MWCNTs) with carbon nanofibers.

3. What is the difference between regular and graphitized carbon nanofibers?

Graphitized carbon nanofibers undergo additional thermal processing intended to increase graphitic ordering. Greater structural ordering can influence electrical conductivity, thermal transport, and chemical stability. However, actual performance depends on the graphitization process, defect concentration, and final material properties. NANOGRAFi also offers Graphitized Carbon Nanofibers for researchers evaluating alternative carbon structures and higher-purity grades.

4. Can carbon nanofibers improve the electrical conductivity of polymer composites?

Yes. Carbon nanofibers can be incorporated into insulating polymer matrices to create electrically conductive pathways. When the concentration and distribution of fibers are sufficient, a connected network may form and significantly change the electrical behavior of the composite. The required loading depends on fiber aspect ratio, dispersion quality, processing conditions, and polymer chemistry. For comparison, Carbon Nanotubes are another widely investigated class of conductive fillers.

5. Are carbon nanofibers suitable for lithium-ion batteries and supercapacitors?

Carbon nanofibers are investigated as conductive additives, electrode components, and structural supports in lithium-ion batteries and supercapacitors. Their conductive networks may facilitate electron transport and support electrochemically active materials. However, improvements in capacity, cycling stability, or rate performance depend on electrode formulation and cell design. Researchers developing electrodes can also explore NANOGRAFi's Battery Materials collection for complementary materials.

6. How can carbon nanofibers be dispersed in polymer matrices or solvents?

Carbon nanofibers can form agglomerates because of interactions between adjacent fibers. Mechanical mixing, controlled ultrasonication, compatible dispersants, and surface modification may improve their distribution in selected liquids and polymer systems. Dispersion methods should be optimized for the intended application, since excessive processing may shorten fibers or modify their surface properties. Researchers requiring alternative surface chemistry may also evaluate functionalized multi-walled carbon nanotubes.

7. Can carbon nanofibers be used in EMI shielding and conductive coatings?

Carbon nanofibers are investigated as conductive fillers in electromagnetic interference (EMI) shielding composites and functional coatings. Their elongated morphology can contribute to interconnected conductive pathways that influence electrical and electromagnetic behavior. Shielding effectiveness depends on filler concentration, composite thickness, frequency range, dispersion, and material architecture. The suitability of this carbon nanofiber grade should be evaluated under the intended operating conditions.

8. Where can researchers find scientific publications related to carbon nanomaterials?

Researchers can review NANOGRAFi's Carbon Nanotube Scientific Publication List, which includes research involving carbon nanotubes and related composite applications. These publications can provide useful background on conductive networks, reinforcement mechanisms, sensors, and energy-related materials. Because carbon nanofibers and carbon nanotubes have different structures, results reported for CNTs should not automatically be assumed to apply to CNFs.

9. How should carbon nanofibers be stored and handled safely?

Carbon nanofibers should be stored in tightly sealed containers under clean, dry conditions to minimize contamination and unintended powder release. Handling procedures should minimize airborne particles through suitable containment, local exhaust ventilation, and appropriate personal protective equipment. Researchers should follow the product-specific Safety Data Sheet (SDS) and applicable laboratory safety procedures when transferring, weighing, or dispersing carbon nanofibers.