Highly sensitive detection of Hg2+ employing SPR sensor modified with chitosan/poly (vinyl alcohol)/SnO2 film
Highly sensitive detection of Hg2+ employing SPR sensor modified with chitosan/poly (vinyl alcohol)/SnO2 film
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采用壳聚糖/聚(乙烯醇)/SnO2薄膜修饰的SPR传感器高灵敏检测Hg2
DOI：
10.1007/s00216-021-03542-x
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发表时间：
2021-08
影响因子：
4.3
通讯作者：
Wei Wei
中科院分区：
文献类型：
--
作者：
Guilian Lan;Ruirui Zhu;Weifeng Jin;Peng Luo;Rong Chen;Juemin Yi;Wei Wei
汞离子（Hg 2+）对水体的污染对环境、生态系统和人体健康造成了不可逆转的严重影响，需要进一步完善低浓度Hg 2+的监测方法。本文提出了一种新型的表面等离子体共振（SPR）汞离子传感器，该传感器具有灵敏度高、操作简单、无需标记、成本低等优点。得益于SnO 2纳米颗粒相对较高的折射率，在金属-溶液界面处产生的倏逝场可以显著增强，这导致灵敏度提高5倍。通过对传感器组成的优化，传感器的灵敏度为25.713 nm/μg/L，计算检出限为6.61 ng/L（32.95 pM）。这样的检测限明显低于美国环境保护局设定的饮用水中的限值（10 nM）。此外，通过FTIR和XPS表征，进一步证实了功能化壳聚糖/聚乙烯醇复合材料对Hg 2+具有较高的选择性，这是由于功能化壳聚糖/聚乙烯醇复合材料产生了大量的特异性吸附结合位点。所提出的传感器还表现出很大的重复性和良好的时间稳定性为15天。该研究为开发高性能的SPR传感器提供了一种新的思路，并在环境监测中具有广阔的应用前景。
Water contamination by mercury ions (Hg2+) causes irreversible and serious effect on the ambient environment, ecological systems, and human health, necessitating further improvement of Hg2+ monitoring at low concentrations. Here, we proposed a novel surface plasmon resonance (SPR) sensor for Hg2+ detection with desirable advantages of high sensitivity, simple operation, label-free, and low cost, in which the chitosan/poly (vinyl alcohol)/SnO2 composite film was modified on sensing surface as the active layer for sensitivity enhancement. Benefiting from the relatively high refractive index of SnO2 nanoparticles, the evanescent field generated at the metal-solution interface can be significantly enhanced, which results in a 5 times improvement of sensitivity. Through appropriate optimization in the aspects of componential constitutions, the sensor exhibits excellent sensitivity of 25.713 nm/μg/L and ultra-low calculated detection limit of 6.61 ng/L(32.95 pM). Such detection limit is strikingly lower than the limitation (10 nM) in drinking water set by the US Environmental Protection Agency. In addition, the as-prepared sensor presents relatively high selectivity for Hg2+, attributing to plenty of binding sites for specific adsorption produced by functionalized chitosan/poly (vinyl alcohol) composites, which have been furtherly verified by characterization of FTIR and XPS spectra. The proposed sensor also exhibits great repeatability and good time stability for 15 days. This work provides a promising strategy for developing high-performance SPR sensor for Hg2+ detection and a prospective application in environmental monitoring.
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4
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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