Periodic voids arrays for surface-enhanced Raman scattering( SERS) have been fabricated,by which the multilayer silica colloidal crystal-polymer composites with an unusual non-close-packed structure were utilized as the structural templates. Uniform voids array over wafer-sized areas(81 cm2)can be reproducibly obtained by a brief HF etching-off colloidal silica in the outer layer of the templates and then surface metal deposition. The SERS enhancement factor( EF) of the resulting voids array reaches into 108 orders of magnitude and the relative standard deviation ( RSD ) of EF is less than 8% utilizing benzenethiol as the Raman probe. Surface density(Γ)of voids can be controlled easily by adjusting the volume ratio(RS-P)of silica and polymer. The unique hexagonal patterning of voids is unchangeable in the RS-P range of 20%to 42%,accordingly,the value ofΓchanges from 4. 65×108 voids/cm2 to 6. 92×108 voids/cm2.%以内嵌于聚合物呈非紧密接触堆积的SiO2微球阵列为模板，经HF蚀除表层SiO2微球后再经金属物理覆镀，得到81 cm2/片的球凹阵列SERS基底。以苯硫酚为探针，所得阵列的SERS效应显著( EF高达108量级)，并且重现性良好( EF的RSD<8%)；将SiO2与聚合物的体积比( RS-P )在20%-42%范围内改变，基底表面球凹均可保持六边形周期性排布，球凹的排布密度(Γ)在4．65×108个/cm2-6．92×108个/cm2范围内相应改变。
展开▼
