The continuous tuning of plasmonic nanoassembly’s structure is the key to manipulate their optical and catalytic properties. Herein, we report a strategy of using macroscopic deformation to continuously tune the structure and optical activity of massive plasmonic nanoassemblies that are embedded in elastic polymer matrix. Plasmonic gold nanoparticles (Au NPs) are assembled to nanochains (Au NCs) with defined length and further embedded into polyvinylpyrrolidone (PVP) matrix. The nanostructure and plasmonic properties of massive Au NCs in this Au NCs-PVP film can be simultaneously and continuously tuned, simply by reversible mechanical deformation of this elastic film. In this way, the surface-enhanced Raman scattering (SERS) enhancement factor of this film as a SERS substrate can be mechanically modulated in the range of 10⁰ to 6.8 × 10⁷. Meanwhile, the PVP matrix also serves as a selective diffusion barrier to eliminate the fluorescence interference of large biomolecules, which enables the Au NCs-PVP film as a convenient SERS substrate for quick and direct analysis of small molecule analytes in biological samples and food, avoiding the complicate and time-consuming sample pretreatment process.

等离子体纳米组件结构的连续调节是操纵其光学和催化性能的关键。在这里，我们报告了一种使用宏观变形来连续调整嵌入弹性聚合物基体中的大规模等离子体纳米组件的结构和光学活性的策略。等离子体金纳米颗粒（Au NPs）组装成具有确定长度的纳米链（Au NCs），然后进一步嵌入聚乙烯吡咯烷酮（PVP）基质中。只需通过该弹性膜的可逆机械变形，即可同时连续地调谐该Au NCs-PVP膜中大量Au NCs的纳米结构和等离子体性能。以此方式，该膜作为SERS基底的表面增强拉曼散射（SERS）增强因子可以在10的范围内进行机械调节。⁰至6.8×10 ⁷。同时，PVP基质还可以用作选择性扩散屏障，以消除大分子的荧光干扰，从而使Au NCs-PVP膜成为方便的SERS基质，可快速直接地分析生物样品和食品中的小分子分析物，避免了复杂且耗时的样品预处理过程。