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课题组孙斌、姜享旭、王后禹等同学在Analytical Chemistry发表论文

发布日期:2014-12-25


题目:  A Surface-Enhancement Raman Scattering Sensing Strategy for Discriminating Trace Mercuric Ion (II) from Real Water Samples in Sensitive, Specific, Recyclable and Reproducible Manners


作者:Bin Sun,(共同第一作者) Xiangxu Jiang,(共同第一作者) Houyu Wang,(共同第一作者) Bin Song, Ying Zhu, Hui Wang, Yuanyuan Su,and Yao He,*


单位:
Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, Suzhou 215123, China

摘要:

It is of essential importance to precisely probe mercury (II) (Hg2+) ions for environment-protection analysis and detection. To date, there still remain major challenges for accurate, specific, and reliable detection of Hg2+ ions at sub-ppt level. We herein employ gold nanoparticles (AuNPs) decorated silicon nanowire array (SiNWAr) as active surface-enhanced Raman scattering (SERS) substrates to construct high-performance sensing platform assisted by DNA technology, enabling ultrasensitive detection of trace Hg2+ with short assay time (~64 min) and low sample consumption (~30 μL). Typically, strong SERS signals could be detected when the single-stranded DNA structure converts to the hairpin structure in the presence of Hg2+ ions, due to the formation of thymine (T)-Hg2+-T. As a result, Hg2+ ions with low concentration of 1 pM (0.2 ppt) can be readily discriminated, much lower than those (~nM) reported for conventional analytical strategies. Water samples spiked with various Hg2+ concentrations are further tested, exhibiting a good linear relationship between the normalized Raman intensities and the logarithmic concentrations of Hg2+ ranging from 1 pM to 100 nM, with a correlation coefficient R2=0.998. In addition, such SERS sensor features excellent selectivity, facilely distinguishing Hg2+ ions from ten kinds of interfering metal ions. Moreover, this presented SERS sensor possesses good recyclability, preserving adaptable reproducibility during 5-time cyclic detection of Hg2+. Furthermore, unknown Hg2+ concentra-tion in river water can be readily determined through our sensing strategy in accurate and reliable manners, with the RSD value of ~9%.


影响因子:5.695


分区情况:2区

相关链接: http://pubs.acs.org/doi/abs/10.1021/ac503939d

 
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