Highly crystalline two-dimensional (2D) superconductors are emerging as promising platforms for exploring quantum phenomena. Currently, 2D crystalline superconductors are mainly limited to layered materials. In contrast, non-layered 2D superconductors have rarely been investigated due to the inherent challenges for their synthesis within the 2D limit. Here, we developed a facile approach for the synthesis of non-layered 2D superconductors by inducing interfacial reactions at solid–solid interfaces which naturally serve as 2D templates. Highly crystalline 2D PdTe, a typical non-layered superconductor, has been successfully synthesized via this approach. The obtained 2D PdTe exhibited 2D superconductivity with thickness-dependent onset critical temperatures as low as ~2.56 K, lower than that of bulk PdTe. In addition to PdTe, other materials including 2D PtTe have been synthesized via this approach. Our work offers a controlled synthetic route to 2D non-layered materials with intriguing properties for fundamental research and practical applications.

高度结晶的二维（2D）超导体正在成为探索量子现象的有前途的平台。目前，二维晶体超导体主要限于层状材料。相比之下，非层状二维超导体由于在二维限制内合成的固有挑战而很少被研究。在这里，我们开发了一种简便的方法来合成非层状 2D 超导体，方法是在自然用作 2D 模板的固-固界面处诱导界面反应。通过这种方法成功合成了一种典型的非层状超导体高度结晶的二维 PdTe。获得的 2D PdTe 表现出 2D 超导性，其与厚度相关的起始临界温度低至 ~2.56 K，低于块状 PdTe。除了 PdTe，通过这种方法合成了包括 2D PtTe 在内的其他材料。我们的工作为具有有趣特性的二维非层状材料提供了一种受控合成路线，可用于基础研究和实际应用。