|About this Abstract
||MS&T22: Materials Science & Technology
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Safer Etching of Ti3AlC2 MAX Phases to Directly Yield Ti3C2Tz MXene Nanosheets Using Quarternary Ammonium Fluorides
||Vrushali Kotasthane, Zeyi Tan, Junyeong Yun, Jodie L. Lutkenhaus, Micah J. Green, Miladin Radovic
|On-Site Speaker (Planned)
MXene are commonly synthesized by selective etching of A element from a parent MAX in HF or mixtures of alkali fluorides and HCl, followed by their intercalation and exfoliation. However, the health hazards associated with using highly toxic chemicals in their synthesis still remain on of the major concerns for scaling up MXene production. To address this challenge, a safer process is used in this study consisting of a simultaneous etching and exfoliation using mixture of tetramethylammonium fluoride (TMAF) and HCl at room temperature. The large size of the quaternary ammonium ion was found to promote intercalation and exfoliation during etching, and thus MXene nanosheets were obtained with yields exceeding 30% directly during etching without need for post-etching intercalation and exfoliation as in the case of conventional synthesis. The functional group distribution of the Ti3C2Tz was found to vary with the etching duration and the morality of TMAF and HCl.