LSPR Tunable Ag@PDMS SERS Substrate for High Sensitivity and Uniformity Detection of Dye Molecules.
LSPR Tunable Ag@PDMS SERS Substrate for High Sensitivity and Uniformity Detection of Dye Molecules.
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用于染料分子高灵敏度和均匀性检测的 LSPR 可调谐 Ag@PDMS SERS 基底
DOI：
10.3390/nano12213894
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发表时间：
2022-11-04
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影响因子：
--
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目前，采用高效且经济的方法构建高灵敏度、均匀性和重现性的等离激元表面增强拉曼散射（SERS）基底仍然是满足SERS技术实际应用的关键。本文采用低成本生物模板剥离方法和磁控溅射技术成功构建了局域表面等离子体共振（LSPR）可调谐柔性Ag@PDMS基底。理论证明，通过改变周期性纳米腔阵列结构中光腔单元的尺寸，可以调节局部电磁场增强和“热点”分布。实验上，以罗丹明6G（R6G）为目标分析物，详细研究了最佳Ag@PDMS基底（Ag膜厚为315 nm）的SERS性能，最低检出限为10−11 M，增强因子为8.03 × 108，灵敏度较高。计算得到的相对标准偏差(RSD)为10.38%，表明所制备的基板具有优异的电磁场增强均匀性。最后，还实现了结晶紫（CV，LOD = 10−9 M）的痕量检测和三种常见染料（R6G，CV和亚甲蓝（MB）混合物）的同时检测。这一结果表明SERS底物在染料分子的定量和定性检测中具有良好的应用前景。
At present, the use of efficient and cost-effective methods to construct plasmonic surface-enhanced Raman scattering (SERS) substrates of high sensitivity, uniformity and reproducibility is still crucial to satisfy the practical application of SERS technology. In this paper, a localized surface plasmonic resonance (LSPR) tunable flexible Ag@PDMS substrate was successfully constructed by the low-cost bio-template-stripping method and magnetron sputtering technology. The theory proves that the local electromagnetic field enhancement and “hot spot” distribution is adjustable by modifying the size of the optical cavity unit in the periodicity nanocavity array structure. Experimentally, using rhodamine 6G (R6G) as the target analyte, the SERS performance of optimal Ag@PDMS substrate (Ag film thickness for 315 nm) was researched in detail, which the minimum detection limit was 10−11 M and the enhancement factor was calculated as 8.03 × 108, indicating its high sensitivity. The relative standard deviation (RSD) was calculated as 10.38%, showing that the prepared substrate had excellent electromagnetic field enhancement uniformity. At last, the trace detection of Crystal violet (CV, LOD = 10−9 M) and the simultaneous detection of three common dyes (R6G, CV and Methylene blue (MB) mixture) were also realized. This result suggests that the SERS substrate has a good application prospect in the quantitative and qualitative detection of dye molecules.
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DOI：
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发表时间：
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期刊：
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影响因子：
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