Cao Pengfei, Chen Huizhen, Zhang Hailong, Cheng Lin, Niu Tiaoming
School of Information Science and Engineering, Lanzhou University Lanzhou 730000 P. R. China
RSC Adv. 2018 Oct 12;8(61):35005-35013. doi: 10.1039/c8ra07711h. eCollection 2018 Oct 10.
A high refractive index sensitivity of Au@Cu 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@Cu 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@Cu 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.
理论上证明了在近红外区域工作的金@硫化铜核壳纳米棒具有高折射率灵敏度。我们传感器的灵敏度达到每折射率单位（RIU）1200纳米，高于其他金属-金属核壳纳米棒。原因是金@硫化铜核壳纳米棒的新材料和结构导致了独特的传感原理。值得注意的是，折射率（RI）灵敏度对壳层厚度与核半径之比的影响比对纵横比的影响更敏感。这些结果表明，在近红外区域工作的金@硫化铜核壳纳米棒优异的灵敏度性能可作为检测少量化学物质和生物分子折射率微小变化的新工具。
