100nm周期蛾眼结构制备及其表面拉曼增强性能

Fabrication of 100 nm-Period Moth-Eye Structure and Its Surface Enhanced Raman Scattering

以多孔氧化铝(AAO)为模板,基于聚氨酯丙烯酸酯(PUA)在紫外曝光前后的表面能变化的特性,利用逆紫外固化纳米压印技术实现纳米蛾眼结构复制成型。分析图形复制过程中界面间的粘附功差异,根据红外光谱对C=C双键的转化速度来表征PUA的固化程度进而优化制作工艺,在柔性聚对苯二甲酸乙二酯薄膜表面制备出周期为100 nm的PUA大面积高深宽比柱状纳米结构阵列。利用具有蛾眼纳米结构的银金属薄膜,进行表面拉曼增强特性实验,得到了葡萄糖分子的表面增强拉曼散射效应。

The polyurethane acrylat（ PUA） nano-pillar arrays,with a period of 100 nm and resembling the moth-eye structure,were fabricated on polyethylene terephthalate substrate by ultraviolet（ UV） nano-imprinting technique with an anodized aluminum oxide（ AAO） template,to achieve surface enhanced Raman scattering. The impact of the fabrication conditions,including but not limited to the properties of AAO template,curing time,UV irradiation intensity and type of mold release agent,on the nano-structures and mechanical properties of the nano-pillar arrays was investigated with scanning electron microscopy,Raman spectroscopy and Fourier transform infrared（FT-IR） spectroscopy. The curing of the PUA pillar-arrays was characterized by FT-IR measurement of the C = C double-bondconversion. Exemplified by Raman spectroscopy analysis of glucose,the fairly uniform nano-pillar array with high density and high aspect-ratio,fabricated under the optimized conditions and coated with 50 nm silver,produced strong surface enhanced Raman scattering.