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High-sensitivity refractive index of Au@Cu2- S core-shell nanorods
Pengfei Cao1, Huizhen Chen1, Hailong Zhang1
1School of Information Science and Engineering, Lanzhou University Lanzhou 730000 P. R. China caopf@lzu.edu.cn.
Abstract:
A high refractive index sensitivity of Au@Cu2- S core-shell nanorods working in the near-infrared is theoretically demonstrated. The sensitivity of our sensor reaches 1200 nm per Refractive Index Unit (RIU), which is higher than that of other metal-metal core-shell nanorods. The reason is that the new materials and structure of Au@Cu2- S core-shell nanorods lead to a unique sensing principle. It is noteworthy that the refractive index (RI) sensitivity is more susceptible to the effects of the shell-thickness to core-radius ratio than to the aspect ratio. These results show that the excellent sensitivity performance of Au@Cu2- S core-shell nanorods working in the near-infrared can be treated as a new tool to detect the minute variations in refractive index for small amounts of chemicals and biomolecules.
