Fabrication of gold flower-like arrays based on nanosphere lithography for Raman enhancement
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摘要: 基于纳米球光刻技术制备了一种花状纳米金结构阵列，经过PS509 nm球旋凃和ICP氧刻蚀，再通过镀金膜与高温退火工艺，纳米球阵列的表面被粗糙化，进而形成了一种鳞状的花状阵列 。FDTD仿真结果表明，制备的这种阵列具备很高的电磁场增强特性，主要的增强集中于纳间隙的边缘处。以罗丹明 6G染料为探针分子测试基底的拉曼效应，与金基底的拉曼信号相比，该纳米结构阵列拉曼增强效应明显，对罗丹明 6G的检测极限达到了10-6 mol/L的水平。Abstract: Gold flower-like nanoarrays based on nanosphere lithography (NSL) have been fabricated for Raman enhancement. After spin-costing of 509 nm polystyrene nanosphere and O2 etching of the substrate, deposition and annealing make the gold nanoarrays bulging, forming the flower-like nanoarrays. FDTD simulation of the nanostructures shows that these nanoarrays show high electromagnetic enhancement. Main enhancements are on the edges of the substrate. At last, Raman tests using Rhodamine 6G indicate that these nanoarrays show high Raman intensity when comparing with that of Au substrate. Minimum Rhodamine 6G detection limit of these arrays can reach the level of 10-6 mol/L.
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Key words:
- nanosphere lithography /
- flower-like arrays /
- FDTD simulation /
- Raman test
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