A silver film is in situ grafted on a melamine sponge via the silver mirror reaction. The porous structure of the sponge possesses an enlarged total SERS-active surface area without increasing the overall footprint of the SERS substrate. The Ag-grafted sponge exhibits high SERS activity toward Rhodamine 6G with a concentration down to 0.1 pM. Moreover, the sponge-based substrate also offers a good signal uniformity and reproducibility with a relative signal deviation down to 11.7% and 13.2%, respectively. Furthermore, the Ag-grafted sponge exhibits a limit of detection of 4.23 nM toward adenine and 1.88 nM toward thiram in the aqueous solution by a handheld portable Raman spectrometer. The inexpensive and simple Ag-grafted sponge can be used as an effective SERS substrate, which will find the potential application in field-deployable detection of organic pollutants in the aquatic environment.

银膜就位通过银镜反应将其接枝在三聚氰胺海绵上。海绵的多孔结构具有扩大的SERS活性表面积，而不会增加SERS基材的总占地面积。银接枝的海绵对罗丹明6G表现出很高的SERS活性，浓度低至0.1 pM。此外，基于海绵的基材还提供了良好的信号均匀性和可再现性，相对信号偏差分别降至11.7％和13.2％。此外，通过手持式便携式拉曼光谱仪，在水溶液中，Ag接枝的海绵对腺嘌呤的检测限为4.23 nM，对硫胺的检测限为1.88 nM。廉价且简单的Ag接枝海绵可用作有效的SERS基材，