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Three-dimensional porous SERS powder for sensitive liquid and gas detections fabricated by engineering dense “hot spots” on silica aerogel
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0na00849d Longkun Yang 1 , Zhifang Ren 1 , Meng Zhang 1 , Yanli Song 1 , Pan Li 1, 2 , Yun Qiu 1 , Pingye Deng 2 , Zhipeng Li 1
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0na00849d Longkun Yang 1 , Zhifang Ren 1 , Meng Zhang 1 , Yanli Song 1 , Pan Li 1, 2 , Yun Qiu 1 , Pingye Deng 2 , Zhipeng Li 1
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A three-dimensional porous SERS powder material, Ag nanoparticles-engineered-silica aerogel, was developed. Utilizing an in situ chemical reduction strategy, Ag nanoparticles were densely assembled on porous aerogel structures, thus forming three-dimensional “hot spots” distribution with intrinsic large specific surface area and high porosity. These features can effectively enrich the analytes on the metal surface and provide huge near field enhancement. Highly sensitive and homogeneous SERS detections were achieved not only on the conventional liquid analytes but also on gas with the enhancement factor up to ∼108 and relative standard deviation as small as ∼13%. Robust calibration curves were obtained from the SERS data, which demonstrates the potential for the quantification analysis. Moreover, the powder shows extraordinary SERS stability than the conventional Ag nanostructures, which makes long term storage and convenient usage feasible. With all of these advantages, the porous SERS powder material can be extended to on-site SERS “nose” applications such as liquid and gas detections for chemical analysis, environmental monitoring, and anti-terrorism.
中文翻译：
通过在二氧化硅气凝胶上设计致密“热点”制造用于灵敏液体和气体检测的三维多孔 SERS 粉末
开发了一种三维多孔 SERS 粉末材料 Ag 纳米颗粒工程二氧化硅气凝胶。利用原位化学还原策略，Ag纳米粒子在多孔气凝胶结构上密集组装，从而形成具有固有大比表面积和高孔隙率的三维“热点”分布。这些特征可以有效地富集金属表面的分析物并提供巨大的近场增强。不仅在常规液体分析物上实现了高灵敏度和均匀的 SERS 检测，而且在气体上也实现了检测，增强因子高达 ∼10 8和相对标准偏差小至~13%。从 SERS 数据中获得了稳健的校准曲线，这证明了量化分析的潜力。此外，与传统的银纳米结构相比，该粉末显示出非凡的 SERS 稳定性，这使得长期储存和方便使用成为可能。凭借所有这些优势，多孔 SERS 粉末材料可以扩展到现场 SERS“鼻子”应用，例如用于化学分析、环境监测和反恐的液体和气体检测。
更新日期：2020-12-24
中文翻译：
通过在二氧化硅气凝胶上设计致密“热点”制造用于灵敏液体和气体检测的三维多孔 SERS 粉末
开发了一种三维多孔 SERS 粉末材料 Ag 纳米颗粒工程二氧化硅气凝胶。利用原位化学还原策略，Ag纳米粒子在多孔气凝胶结构上密集组装，从而形成具有固有大比表面积和高孔隙率的三维“热点”分布。这些特征可以有效地富集金属表面的分析物并提供巨大的近场增强。不仅在常规液体分析物上实现了高灵敏度和均匀的 SERS 检测，而且在气体上也实现了检测，增强因子高达 ∼10 8和相对标准偏差小至~13%。从 SERS 数据中获得了稳健的校准曲线，这证明了量化分析的潜力。此外，与传统的银纳米结构相比，该粉末显示出非凡的 SERS 稳定性，这使得长期储存和方便使用成为可能。凭借所有这些优势，多孔 SERS 粉末材料可以扩展到现场 SERS“鼻子”应用，例如用于化学分析、环境监测和反恐的液体和气体检测。
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