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Ordered Hierarchical Ag Nanostructures as Surface-Enhanced Raman Scattering Platforms for (Bio)chemical Sensing and Pollutant Monitoring
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-10-25 , DOI: 10.1021/acsanm.1c02200 Junxiang Xiang 1 , Yunxia Wang 2 , Yupeng Wu 1 , Hui Fang 1 , Langquan Shui 1 , Ze Liu 1, 3 , Tao Ding 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-10-25 , DOI: 10.1021/acsanm.1c02200 Junxiang Xiang 1 , Yunxia Wang 2 , Yupeng Wu 1 , Hui Fang 1 , Langquan Shui 1 , Ze Liu 1, 3 , Tao Ding 2
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Surface-enhanced Raman scattering (SERS), due to its extreme sensitivity down to the single molecule level, has been a superior analytical technique for (bio)chemical sensing and monitoring. However, the reliability of SERS has been a major issue since its discovery and has not yet been fully addressed, which is largely due to the lack of properly designed SERS substrates and facile, cost-effective fabrication strategies of metallic nanostructures. Herein, we employ hierarchical metallic nanopatterns as active SERS substrates, which can be facilely fabricated by superplastic nanomolding of bulk metals with hierarchical anodic aluminum oxide templates. The SERS signals of such hierarchical metal substrates show both high sensitivity (SERS intensity of up to 106 with an enhancement factor of ∼7.0 × 105) and reproducibility (relative standard deviation as low as 7%) with an optimized configuration, which significantly outperforms that without hierarchical nanostructures. Our results reveal that the microcavities of the hierarchical molds can significantly reduce the nonuniform plastic deformation of the bulk metals caused by surface roughness, while the nanoholes in the microcavities yield densely packed nanopillars with exceptional SERS signals. These hierarchical metallic nanostructures are further applied for the detection of biomolecules and organic dyes with concentrations as low as 10–10 M, whose SERS intensity still presents a prominent signal-to-noise ratio. Such facile and scalable fabrication of hierarchical metallic nanostructures not only sheds light on the key factors that affect the uniformity and sensitivity of SERS but also provides guidelines for rational design of superior SERS substrates with outstanding performances, which is of great implication for (bio)chemical sensing and pollutant monitoring.
中文翻译：
有序分级 Ag 纳米结构作为（生物）化学传感和污染物监测的表面增强拉曼散射平台
表面增强拉曼散射 (SERS) 由于其低至单分子水平的极高灵敏度，已成为（生物）化学传感和监测的卓越分析技术。然而，自发现以来，SERS 的可靠性一直是一个主要问题，尚未得到充分解决，这主要是由于缺乏适当设计的 SERS 基底和金属纳米结构的简便、经济的制造策略。在这里，我们采用分级金属纳米图案作为活性 SERS 基底，可以通过具有分级阳极氧化铝模板的块状金属的超塑性纳米成型轻松制造。这种分层金属基板的 SERS 信号显示出高灵敏度（SERS 强度高达 10 6，增强因子为~7.0 × 105 ) 和可重复性（相对标准偏差低至 7%），优化配置，显着优于没有分层纳米结构的配置。我们的结果表明，分级模具的微腔可以显着减少由表面粗糙度引起的大块金属的非均匀塑性变形，而微腔中的纳米孔产生具有特殊 SERS 信号的密集纳米柱。这些分层金属纳米结构进一步应用于检测浓度低至 10 –10的生物分子和有机染料M，其 SERS 强度仍呈现显着的信噪比。分层金属纳米结构的这种简便和可扩展的制造不仅揭示了影响 SERS 均匀性和灵敏度的关键因素，而且为合理设计具有出色性能的优质 SERS 基底提供了指导，这对（生物）化学具有重要意义。传感和污染物监测。
更新日期：2021-11-26
中文翻译：
有序分级 Ag 纳米结构作为（生物）化学传感和污染物监测的表面增强拉曼散射平台
表面增强拉曼散射 (SERS) 由于其低至单分子水平的极高灵敏度，已成为（生物）化学传感和监测的卓越分析技术。然而，自发现以来，SERS 的可靠性一直是一个主要问题，尚未得到充分解决，这主要是由于缺乏适当设计的 SERS 基底和金属纳米结构的简便、经济的制造策略。在这里，我们采用分级金属纳米图案作为活性 SERS 基底，可以通过具有分级阳极氧化铝模板的块状金属的超塑性纳米成型轻松制造。这种分层金属基板的 SERS 信号显示出高灵敏度（SERS 强度高达 10 6，增强因子为~7.0 × 105 ) 和可重复性（相对标准偏差低至 7%），优化配置，显着优于没有分层纳米结构的配置。我们的结果表明，分级模具的微腔可以显着减少由表面粗糙度引起的大块金属的非均匀塑性变形，而微腔中的纳米孔产生具有特殊 SERS 信号的密集纳米柱。这些分层金属纳米结构进一步应用于检测浓度低至 10 –10的生物分子和有机染料M，其 SERS 强度仍呈现显着的信噪比。分层金属纳米结构的这种简便和可扩展的制造不仅揭示了影响 SERS 均匀性和灵敏度的关键因素，而且为合理设计具有出色性能的优质 SERS 基底提供了指导，这对（生物）化学具有重要意义。传感和污染物监测。
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