Colorimetric and visual sensing of ferrous ion by Fenton reaction-stimulated etching of triangular gold nanoplates
Colorimetric and visual sensing of ferrous ion by Fenton reaction-stimulated etching of triangular gold nanoplates
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DOI：
10.1016/j.saa.2023.122837
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发表时间：
2023-05-18
影响因子：
4.4
通讯作者：
Luo，Liqiang
中科院分区：
文献类型：
--
作者：
He，Haibo;Huang，Juan;Luo，Liqiang
在这项研究中，发展了一种基于Fenton反应介导的三角形金纳米板(Au NPLs)刻蚀的Fe2+超灵敏传感方法。在本实验中，由于Fenton反应产生超氧阴离子自由基(O2·-)，在Fe2+存在下，H_2O_2加速了Au NPLs的刻蚀。随着Fe2+浓度的增加，Au NPLs的形状由三角形转变为球形，伴随着局域表面等离子体共振的蓝移，伴随着从蓝色、蓝紫色、紫色、红紫色到粉红色的一系列连续颜色变化。丰富的颜色变化使Fe2+的快速视觉定量测定在10分钟内实现。Fe~(2+)浓度在0.035~1.5GμM范围内与峰位移值呈良好的线性关系(R2=0.0.996)。在其他被测金属离子存在的情况下，该比色法具有良好的灵敏度和选择性。UV-Vis光谱对Fe~(2+)的检出限(3ơ/k)为26 nm，肉眼可分辨的Fe~(2+)浓度低至0.07μM。池塘水和血清样品的加标回收率在96%~106%之间，日间相对标准偏差均为3.6%，证明了该方法可用于实际样品中Fe2+的测定。
In this study, a method for ultrasensitive sensing of Fe2+based on Fenton reaction mediated etching of triangular gold nanoplates (Au NPLs) was developed. In this assay, the etching of Au NPLs by H2O2was accelerated in the presence of Fe2+due to the generation of superoxide free radical (O2·-) via Fenton reaction. With the concentration of Fe2+increased, the shape of Au NPLs changed from triangular to sphere with the blue shifted localized surface plasmon resonance, accompanying a series of consecutive color changes from blue, bluish purple, purple, reddish purple and finally to pink. The rich color variations enable rapid visual quantitative determination of Fe2+within 10 min. A good linear relationship between the peak shifts and the concentration of Fe2+was obtained in the range of 0.035 to 1.5 μM (R2= 0.996). Favorable sensitivity and selectivity in the presence of other tested metal ions were achieved in the proposed colorimetric assay. The detection limits (3ơ/k) for Fe2+was 26 nM by UV–vis spectroscopy, and the clearly discernible concentration of Fe2+was as low as 0.07 μM by naked eyes. The recoveries of fortified samples in pond water and serum samples ranged from 96% to 106% with interday relative standard deviations <3.6% in all cases, demonstrating the applicability of the assay for measuring Fe2+in real samples.