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首页> 美国卫生研究院文献>Frontiers in Chemistry >Detection of mercury ions using silver telluride nanoparticles as a substrate and recognition element through surface-enhanced Raman scattering
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Detection of mercury ions using silver telluride nanoparticles as a substrate and recognition element through surface-enhanced Raman scattering

机译：以碲化银纳米粒子为底物和通过表面增强拉曼散射的识别元件检测汞离子

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摘要

In this paper we unveil a new sensing strategy for sensitive and selective detection of Hg2+ through surface-enhanced Raman scattering (SERS) using Ag2Te nanoparticles (NPs) as a substrate and recognition element and rhodamine 6G (R6G) as a reporter. Ag2Te NPs prepared from tellurium dioxide and silver nitrate and hydrazine in aqueous solution containing sodium dodecyl sulfate at 90°C with an average size of 26.8 ± 4.1 nm (100 counts) have strong SERS activity. The Ag2Te substrate provides strong SERS signals of R6G with an enhancement factor of 3.6 × 105 at 1360 cm−1, which is comparable to Ag NPs. After interaction of Ag2Te NPs with Hg2+, some HgTe NPs are formed, leading to decreases in the SERS signal of R6G, mainly because HgTe NPs relative to Ag2Te NPs have weaker SERS activity. Under optimum conditions, this SERS approach using Ag2Te as substrates is selective for the detection of Hg2+, with a limit of detection of 3 nM and linearity over 10–150 nM. The practicality of this approach has been validated for the determination of the concentrations of spiked Hg2+ in a pond water sample.
机译：在本文中，我们提出了一种新的传感策略，用于通过以Ag2Te纳米颗粒（NPs）为底物和识别元素和罗丹明6G（Sr）的表面增强拉曼散射（SERS）灵敏和选择性地检测Hg 2 + 。 R6G）作为记者。由二氧化碲，硝酸银和肼在90°C含十二烷基硫酸钠的水溶液中制得的Ag2Te NP具有很强的SERS活性，该平均粒径为26.8±4.1 nm（100个计数）。 Ag2Te底物在1360 cm -1 处提供R6G的强SERS信号，增强因子为3.6×10 5 ，与Ag NP相当。 Ag2Te NPs与Hg 2 + 相互作用后，形成了一些HgTe NPs，导致R6G的SERS信号降低，这主要是由于相对于Ag2Te NPs的HgTe NPs的SERS活性较弱。在最佳条件下，这种以Ag2Te为底物的SERS方法对于Hg 2 + 的检测是选择性的，检测限为3 nM，线性范围在10–150 nM之间。该方法的实用性已被证实可用于测定池塘水样中加标的Hg 2 + 的浓度。

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