As a core representative of two-dimensional carbon nanomaterials, graphene nanosheets, with their unique atomic-level structure and excellent physicochemical properties, have shown broad application prospects in energy, electronics, and composite materials. Among them, graphene nanosheets with a diameter of 1-3 μm, a thickness of 1-5 nm, and a purity of approximately 99% have become a key focus of industrial applications and scientific research due to their precise dimensions and stable performance. The ultrasonic glass method, as an efficient and green preparation process, provides a reliable path for its large-scale production.
The ultrasonic glass method is a novel preparation technology combining ultrasonic energy and a glass medium. Its core advantage lies in its ability to precisely control the size and purity of graphene nanosheets while preserving their original lattice structure to the maximum extent. This process uses natural graphite as raw material, mixing it with a glass medium in a specific ratio. The vibrational energy of high-frequency ultrasound is then used to achieve gentle exfoliation between graphite layers, effectively avoiding structural defects and impurity residues caused by strong oxidants in traditional chemical exfoliation methods. By optimizing parameters such as ultrasonic power and exfoliation time, uniform nanosheets with diameters of 1-3 μm and thicknesses of 1-5 nm can be stably prepared, meeting the stringent size requirements of high-end applications.
The high purity of approximately 99% is one of the core competitive advantages of this graphene nanosheet. The ultrasonic glass method combines physical exfoliation with multi-stage purification, eliminating the need for complex chemical reagents and effectively removing impurities and residual contaminants from the raw materials, ensuring a carbon content of over 99%. This high purity not only prevents impurities from interfering with the material's electrical and thermal properties but also enhances its chemical stability, allowing it to maintain structural integrity even in complex environments, laying the foundation for high-end applications.
Precisely controllable size parameters and high purity endow this graphene nanosheet with excellent overall performance. The 1-3 μm sheet diameter avoids the agglomeration problem of small-diameter materials while overcoming the poor dispersibility of large-diameter materials, allowing for uniform dispersion in various matrices. The 1-5 nm thickness corresponds to a 1-10 layer graphene stacked structure, retaining the ultra-high electrical and thermal conductivity of single-layer graphene while enhancing mechanical stability through interlayer forces. Its electrical conductivity reaches 550-1100 S/cm, and its thermal conductivity exceeds 5000 W/m·K, while also possessing ultra-high mechanical strength, demonstrating irreplaceable advantages in multiple fields.
Currently, graphene nanosheets of this size are gradually being applied in various fields. In energy storage, they can be used as conductive additives in lithium-ion batteries and supercapacitors, improving device charge/discharge efficiency and cycle life. In composite materials, adding a small amount of these nanosheets can significantly improve the strength, thermal conductivity, and corrosion resistance of polymers and metal matrices. In electronics, their excellent conductivity can be used in the fabrication of flexible electronics, sensors, and other devices.
Graphene nanosheets prepared by the ultrasonic glass method, with their precise dimensions, ultra-high purity, and green and efficient preparation process, have overcome the challenges of uneven size, insufficient purity, and severe pollution in traditional graphene preparation. With continuous optimization of the preparation technology, their application scenarios will be further expanded, injecting new impetus into the upgrading and development of the new materials industry and helping to achieve the localization and large-scale application of high-end nanomaterials.
