Development of highly sensitive, stable, and repeatable surface-enhanced Raman scattering (SERS) substrates is crucial for analytical detection, which is a challenge for traditional metallic structures. Here, by exploiting the high surface activity of the 1T′ transition metal telluride, we fabricate high-density gold nanoparticles (AuNPs) that are prepared spontaneously in situ on the 1T′ MoTe₂ atomic layers, forming a plasmonic-2D material hybrid SERS substrate. This AuNP formation is unique to the 1T′ phase, which is repressed in 2H MoTe₂ with lower surface activity. The hybrid structure generates coupling effects of electromagnetic and chemical enhancements, as well as excellent molecule adsorption, leading to ultrasensitive (4 × 10⁻¹⁷ M) and reproducible detection. Flexible SERS tapes are demonstrated in practical applications. Our approach facilitates ultrasensitive SERS detection by a facile method, as well as an enhanced mechanistic understanding of SERS beyond plasmonic effects.

开发高灵敏度、稳定和可重复的表面增强拉曼散射 (SERS) 基板对于分析检测至关重要，这对传统金属结构来说是一个挑战。在这里，通过利用 1T' 过渡金属碲化物的高表面活性，我们制造了在 1T' MoTe ₂原子层上自发原位制备的高密度金纳米粒子 (AuNPs) ，形成了等离子体-2D材料混合 SERS 衬底. 这种 AuNP 形成是 1T' 相所独有的，它在具有较低表面活性的2H MoTe _{2 中}被抑制。混合结构产生电磁和化学增强的耦合效应，以及优异的分子吸附，导致超灵敏（4 × 10 ^-17M) 和可重复检测。在实际应用中展示了柔性 SERS 胶带。我们的方法通过一种简便的方法促进了超灵敏的 SERS 检测，并增强了对等离子体效应之外的 SERS 的机械理解。