Engineering the Diameter of Sn Nanowhiskers Derived From MAX Phases via Liquid Media

ABSTRACT Metal nanowires, as representative one‐dimensional (1D) materials, have found widespread applications in electrocatalysis, energy storage, and flexible electronics. Despite the development of various synthetic routes, existing methods still suffer from limitations such as restricted compositional diversity and complex preparation procedures. Recently, a strategy based on the mechanochemical decomposition of MAX phase precursors has been proposed to accelerate the growth of metal whiskers, offering advantages such as rich compositional diversity, template‐free operation, and procedural simplicity, thereby demonstrating promising application potential. However, the whiskers produced by this approach typically exhibit relatively large diameters, hindering their integration into miniaturized nanoscale devices. To address this challenge, this study introduces a liquid medium–assisted strategy to confine the diameter of Sn whiskers derived from Ti 2 SnC, successfully synthesizing Sn nanowires with diameters as low as several tens of nanometers. Experimental results reveal that the liquid medium effectively suppresses the coalescence of metallic nuclei, reduces their initial size, and thereby facilitates the formation of finer whiskers. This strategy not only provides a new experimental foundation for understanding the geometry of A ‐site metal whiskers derived from MAX phases, but also offers a novel approach for the controlled synthesis of various nonprecious metal nanowires.