| 초록 |
Three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrates have attracted great attentions for the ultrasensitive SERS chemical sensors due to their large surface area for the formation of SERS active sites and increased light absorption through the 3D light pathway. Herein, we report the fabrication of vertically aligned and ultrasharp ZnO nanocone arrays hybridized with particle-on-film plasmonic systems for ultrasensitive SERS substrates. In our design of the SERS substrates, the vertically aligned ultrasharp ZnO nanocone arrays enable efficient light trapping and waveguiding. Particle-on-film plasmonic systems, which have been known to provide large electric field enhancements, are fabricated on top of the ZnO nanocone arrays based on Au NPs on Ag films. Finally, we show that the optimally designed SERS sensors based on ZnO nanocone heterostructures can detect zeptomole level (100 zM) of benzenethiol and atomole level (10 aM) of adenine and Rhodamine 6G molecules. |
