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Flexible Microsphere-Embedded Film for Microsphere-Enhanced Raman Spectroscopy
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsami.7b09884 Cheng Xing , Yinzhou Yan , Chao Feng , Jiayu Xu , Peng Dong 1 , Wei Guan , Yong Zeng , Yan Zhao , Yijian Jiang
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsami.7b09884 Cheng Xing , Yinzhou Yan , Chao Feng , Jiayu Xu , Peng Dong 1 , Wei Guan , Yong Zeng , Yan Zhao , Yijian Jiang
Affiliation
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Dielectric microspheres with extraordinary microscale optical properties, such as photonic nanojets, optical whispering-gallery modes (WGMs), and directional antennas, have drawn interest in many research fields. Microsphere-enhanced Raman spectroscopy (MERS) is an alternative approach for enhanced Raman detection by dielectric microstructures. Unfortunately, fabrication of microsphere monolayer arrays is the major challenge of MERS for practical applications on various specimen surfaces. Here we report a microsphere-embedded film (MF) by immersing a highly refractive microsphere monolayer array in the poly(dimethylsiloxane) (PDMS) film as a flexible MERS sensing platform for one- to three-dimensional (1D to 3D) specimen surfaces. The directional antennas and wave-guided whispering-gallery modes (WG-WGMs) contribute to the majority of Raman enhancement by the MFs. Moreover, the MF can be coupled with surface-enhanced Raman spectroscopy (SERS) to provide an extra >10-fold enhancement. The limit of detection is therefore improved for sensing of crystal violet (CV) and Sudan I molecules in aqueous solutions at concentrations down to 10–7 M. A hybrid dual-layer microsphere enhancer, constructed by depositing a MF onto a microsphere monolayer array, is also demonstrated, wherein the WG-WGMs become dominant and boost the enhancement ratio >50-fold. The present work opens up new opportunities for design of cost-effective and flexible MERS sensing platforms as individual or associated techniques toward practical applications in ultrasensitive Raman detection.
中文翻译：
用于微球增强拉曼光谱的柔性微球嵌入膜
具有非凡的微尺度光学特性的介电微球，例如光子纳米射流，光学耳语画廊模式（WGM）和定向天线，引起了许多研究领域的兴趣。微球增强拉曼光谱（MERS）是通过介电微结构增强拉曼检测的一种替代方法。不幸的是，微球单层阵列的制造是MERS在各种样品表面上实际应用的主要挑战。在这里，我们通过将高折射微球单层阵列浸入聚（二甲基硅氧烷）（PDMS）膜中作为一种灵活的MERS传感平台，用于一维至三维（1D到3D）样品表面，从而报告了微球嵌入式膜（MF）。定向天线和波型耳语画廊模式（WG-WGM）有助于MF对拉曼的大部分增强作用。此外，MF可以与表面增强拉曼光谱（SERS）结合使用，以提供> 10倍的额外增强。因此提高了检测限，可检测浓度低至10的水溶液中的结晶紫（CV）和苏丹I分子–7M。还展示了通过将MF沉积到微球单层阵列上而构建的混合型双层微球增强剂，其中WG-WGM占主导地位，并且增强率> 50倍。当前的工作为设计具有成本效益和灵活的MERS传感平台提供了新的机会，将其作为针对超灵敏拉曼检测的实际应用的单独或相关技术。
更新日期：2017-09-19
中文翻译：
用于微球增强拉曼光谱的柔性微球嵌入膜
具有非凡的微尺度光学特性的介电微球，例如光子纳米射流，光学耳语画廊模式（WGM）和定向天线，引起了许多研究领域的兴趣。微球增强拉曼光谱（MERS）是通过介电微结构增强拉曼检测的一种替代方法。不幸的是，微球单层阵列的制造是MERS在各种样品表面上实际应用的主要挑战。在这里，我们通过将高折射微球单层阵列浸入聚（二甲基硅氧烷）（PDMS）膜中作为一种灵活的MERS传感平台，用于一维至三维（1D到3D）样品表面，从而报告了微球嵌入式膜（MF）。定向天线和波型耳语画廊模式（WG-WGM）有助于MF对拉曼的大部分增强作用。此外，MF可以与表面增强拉曼光谱（SERS）结合使用，以提供> 10倍的额外增强。因此提高了检测限，可检测浓度低至10的水溶液中的结晶紫（CV）和苏丹I分子–7M。还展示了通过将MF沉积到微球单层阵列上而构建的混合型双层微球增强剂，其中WG-WGM占主导地位，并且增强率> 50倍。当前的工作为设计具有成本效益和灵活的MERS传感平台提供了新的机会，将其作为针对超灵敏拉曼检测的实际应用的单独或相关技术。
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