Scientists grow MXene crystals from gas, paving way for cheaper electronics
Researchers led by Drexel University developed a gas-phase method to produce MXene crystals, eliminating costly and wasteful steps. This approach uses titanium tetrachloride and methane as precursors.
Researchers at Drexel University, in collaboration with the University of Pennsylvania and Murata Manufacturing Co., Ltd., have developed a new method for producing MXene crystals using a gas-phase process. This approach bypasses the complex and costly traditional methods, which involve multiple steps and generate toxic waste. The new process utilizes titanium tetrachloride and methane, both abundant and inexpensive, to synthesize MXene directly without the need for a MAX phase precursor or acid etching.
The conventional MXene production process involves synthesizing a MAX phase precursor, followed by liquid etching with hydrofluoric acid, washing, and centrifugation. This method is not only costly but also generates toxic waste and potential defects in the MXene flakes. The new gas-phase method simplifies production by using a vapor-phase deposition technique, heating titanium powder with methane in a quartz tube to form crystalline MXene on a substrate.
Led by Yury Gogotsi, a distinguished professor at Drexel University, the study demonstrates that this method can produce MXene with low defect density, suitable for advanced applications in electronics, optics, and quantum technologies. The process also allows for control over the material's properties by adjusting the reaction conditions, such as the surface area of titanium and the geometry of the carrier tube.
The research team found that extending the reaction time leads to larger MXene flakes, suggesting the potential for producing large-area crystals. This method aligns with industrial processes for titania production, indicating scalability for MXene manufacturing. By using titanium sponge instead of high-purity titanium foil, the cost of production is further reduced, making MXene more accessible for commercial applications.
Future research will focus on refining the process to ensure uniformity and control over the MXene's surface chemistry. The team aims to adapt the method for producing MXenes with various chemical compositions, expanding their potential uses. This development marks a significant step towards industrial-scale MXene production, overcoming previous barriers and opening new possibilities for technological applications.
Source: MXenes