Simple, Flexible, and Ultrastable Surface Enhanced Raman Scattering Substrate Based on Plasmonic Nanopaper Decorated with Graphene Oxide

摘要

Surface enhanced Raman spectroscopy (SERS) is becoming a paramountrnanalytical mechanism in nanotechnology and biological/chemical detection.rnHowever, fabrication of highly sensitive SERS substrates often involves expensivernand time-consuming procedures and the resulting materials require carefulrnhandling. Herein, a simple-to-manufacture, highly sensitive, and easy-to-handlernSERS substrate enabled by plasmonic nanopaper decorated with graphenernoxide flakes is reported. Owing to the physicochemical properties gatheredrnby this SERS substrate, the nanocomposite leads to a flexible platform facilitating:rna) analysis of the model analyte (Rhodamine 6G) via a high energyrnlaser (457 nm) with negligible fluorescent background, which is important tornachieve the maximum excitation of the respective localized surface plasmonrnresonance; b) a charge transferring phenomenon associated to the graphenernderivative that, operating in synergy with the previous phenomenon, enhancesrnthe SERS signal and allows an analytical limit of detection of 0.13 × 10~(−9) m,rnwhich is about 2900-fold lower than that obtained with the counterpart substraternmade of silver nanoparticle-decorated nanopaper; c) an ultrastable signalrnwhich remains completely constant at least during 50 days. Furthermore, thernresulting SERS substrate is amenable to a cost-efficient and large-scale productionrnprocess, which furthers laboratory and real world applications of SERS.