Hot spots have been considered as a dominant role in surface enhancement Raman scattering (SERS). Its generation cannot be separated from the ultra-small nanogaps, which will tremendously contribute to the strong electromagnetic field. We propose a AgNPs/[email protected] system with three-dimensional hot spots and tunable nanometer gap by changing the layer of graphene with a simple and facile method. The excellent SERS behaviors of the proposed AgNPs/[email protected] substrate are demonstrated experimentally using rhodamine 6G (R6G) and crystal violet (CV) as probe molecules and theoretically using commercial COMSOL software. The excellent SERS behaviors can be attributed to the electromagnetic mechanism (EM) in all three dimensions introduced by the lateral nanogaps (AgNP-AgNP) and the vertical nanogaps (AgNP-AuNPs), and the chemical enhancement mechanism (CM) induced by the graphene film. For practical application, the prepared sensitive AgNPs/[email protected] SERS substrate was used to detect Malachite green (MG) in sea water, which provides a bran-new avenue for the detection of biological and chemical molecule.

热点被认为是表面增强拉曼散射（SERS）的主要作用。它的产生不能与超小纳米间隙分开，这将极大地促进强电磁场。我们提出了一种AgNPs / [受电子邮件保护的]系统，该系统通过简单易行的方法来改变石墨烯的层，从而具有三维热点和可调节的纳米间隙。使用罗丹明6G（R6G）和结晶紫（CV）作为探针分子，并从理论上使用市售COMSOL软件，通过实验证明了拟议的AgNPs / [受电子邮件保护]底物的优异SERS行为。优异的SERS行为可归因于横向纳米间隙（AgNP-AgNP）和垂直纳米间隙（AgNP-AuNPs）在所有三个维度上引入的电磁机制（EM），以及石墨烯薄膜诱导的化学增强机理（CM）。对于实际应用，使用制备的敏感的AgNPs / [受电子邮件保护的] SERS底物检测海水中的孔雀石绿（MG），这为检测生物和化学分子提供了全新的途径。