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Array-Assisted SERS Microfluidic Chips for Highly Sensitive and Multiplex Gas Sensing.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-12-24 , DOI: 10.1021/acsami.9b19358
Kuo Yang 1 , Shenfei Zong 1 , Yizhi Zhang 1 , Ziting Qian 1 , Yun Liu 1 , Kai Zhu 1 , Lang Li 1 , Na Li 1 , Zhuyuan Wang 1 , Yiping Cui 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-12-24 , DOI: 10.1021/acsami.9b19358
Kuo Yang 1 , Shenfei Zong 1 , Yizhi Zhang 1 , Ziting Qian 1 , Yun Liu 1 , Kai Zhu 1 , Lang Li 1 , Na Li 1 , Zhuyuan Wang 1 , Yiping Cui 1
Affiliation
A novel kind of array-assisted surface-enhanced Raman spectroscopy (SERS) microfluidic chip (ArraySERS chip) is demonstrated for gas sensing, which has the advantages of both ultrahigh sensitivity and multiplex sensing ability. On the one hand, the introduction of a microstructured triangular array can greatly increase the multiple collision probability between gas molecules and sensing interfaces in the channel. Compared with traditional gas sensors using sealed boxes, where gaseous molecules move only by diffusion, the ArraySERS chip exhibits significantly improved sensitivity. On the other hand, a composite nanoparticle is fabricated as a SERS probe for reading out the fingerprint spectral data, which consists of metal-organic framework (MOF) materials [Zeolitic Imidazolate framework-8 (ZIF-8)] and Au@Ag nanocubes, as well as cysteamine (CA) that serves as the gas-capturing agent. The experimental results show that such a structure of the SERS probe can further increase the sensing ability because of better adsorption of ZIF-8 for gas and the lower SERS background of CA itself. In addition, the simultaneous detection of multiplex gases was easily performed according to their own intrinsic SERS signals. Taking aldehyde gas as a model of a typical air pollutant, trace and multicomponent detection was realized using the ArraySERS chip. The limit of detection value was as low as 1 ppb, which is 2 magnitudes lower than that obtained by traditional methods. This strategy can be well extended for the detection of universal gases and help unleash the potential of existing gas sensors, especially for samples at low concentrations in air.
中文翻译:
阵列辅助的SERS微流控芯片,用于高灵敏度和多重气体传感。
提出了一种新型的阵列辅助表面增强拉曼光谱(SERS)微流控芯片(ArraySERS芯片),用于气体传感,具有超高灵敏度和多重传感的优点。一方面,引入微结构三角阵列可以大大增加通道中气体分子与传感界面之间的多次碰撞概率。与使用密封盒的传统气体传感器(气态分子仅通过扩散移动)相比,ArraySERS芯片的灵敏度大大提高。另一方面,制备了一种复合纳米颗粒作为SERS探针,用于读取指纹光谱数据,该复合颗粒由金属有机骨架(MOF)材料[Zeolitic Imidazolate framework-8(ZIF-8)]和Au @ Ag纳米立方体组成,以及用作气体捕获剂的半胱胺(CA)。实验结果表明,由于ZIF-8对气体的更好吸附和CA本身较低的SERS背景,SERS探针的这种结构可以进一步提高传感能力。此外,根据多种气体本身的固有SERS信号,可以轻松地同时检测多种气体。以醛气体为典型的空气污染物模型,使用ArraySERS芯片实现了痕量和多组分检测。检测值的下限低至1 ppb,比传统方法的检测值低2个数量级。该策略可以很好地扩展到检测通用气体,并帮助释放现有气体传感器的潜力,尤其是对于空气中低浓度的样品。
更新日期:2019-12-25
中文翻译:
阵列辅助的SERS微流控芯片,用于高灵敏度和多重气体传感。
提出了一种新型的阵列辅助表面增强拉曼光谱(SERS)微流控芯片(ArraySERS芯片),用于气体传感,具有超高灵敏度和多重传感的优点。一方面,引入微结构三角阵列可以大大增加通道中气体分子与传感界面之间的多次碰撞概率。与使用密封盒的传统气体传感器(气态分子仅通过扩散移动)相比,ArraySERS芯片的灵敏度大大提高。另一方面,制备了一种复合纳米颗粒作为SERS探针,用于读取指纹光谱数据,该复合颗粒由金属有机骨架(MOF)材料[Zeolitic Imidazolate framework-8(ZIF-8)]和Au @ Ag纳米立方体组成,以及用作气体捕获剂的半胱胺(CA)。实验结果表明,由于ZIF-8对气体的更好吸附和CA本身较低的SERS背景,SERS探针的这种结构可以进一步提高传感能力。此外,根据多种气体本身的固有SERS信号,可以轻松地同时检测多种气体。以醛气体为典型的空气污染物模型,使用ArraySERS芯片实现了痕量和多组分检测。检测值的下限低至1 ppb,比传统方法的检测值低2个数量级。该策略可以很好地扩展到检测通用气体,并帮助释放现有气体传感器的潜力,尤其是对于空气中低浓度的样品。