Storage Environment Requirements
Carbon nanotubes (CNTs) require specific environmental conditions during storage to maintain their structural integrity and functional properties. They should generally be placed in a dry, cool, and well-ventilated environment, avoiding direct sunlight and high temperatures. Excessive temperature can cause chemical changes in the surface functional groups of carbon nanotubes, affecting their dispersibility and conductivity; while excessive humidity can lead to moisture absorption or agglomeration, reducing the uniformity of subsequent processing. Therefore, the ideal storage temperature is generally controlled within the range of room temperature to low temperature (approximately 15–25°C), and the relative humidity is maintained between 40% and 60%.
Sealing Measures
Carbon nanotubes have extremely high specific surface area and adsorption capacity, making them highly sensitive to moisture, oxygen, and organic matter in the air. Therefore, well-sealed containers, such as glass bottles with sealed lids or inert material bags, should be used for storage. Desiccants can be placed inside the container to further reduce humidity, while contact with corrosive gases or strong oxidizers should be avoided. Furthermore, gloves and masks should be worn when handling and handling carbon nanotubes to prevent dust inhalation or sample contamination. Regularly checking the container's seal and the material's appearance can also effectively extend its lifespan.
Long-Term Storage Recommendations
For carbon nanotubes stored long-term, it is recommended to establish a dedicated material management system, including numbering, storage time records, and batch information filing. For particularly sensitive or high-purity carbon nanotubes, low-temperature refrigeration (e.g., 4°C) can be considered, and thorough pretreatment should be performed before use to restore dispersibility. If clumping, discoloration, or off-odors are found, its usability should be assessed promptly, and necessary repair or disposal measures should be taken. Through standardized storage and management, the physicochemical properties of carbon nanotubes can be maintained to the greatest extent, ensuring stability and reliability in scientific research and industrial applications.
