11-Mercaptoundecanoic acid capped gold nanoclusters with unusual aggregation-enhanced emission for selective fluorometric hydrogen sulfide determination

Fengniu Lu, Hongwei Yang, Ying Tang, Cheng Ju Yu, Guirong Wang, Zhiqin Yuan*, Hengdao Quan

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

24 引用 (Scopus)

摘要

In present study, we discovered unusual solvent-mediated aggregation-enhanced emission (AEE) character of 11-mercaptoundecanoic acid capped gold nanoclusters (MUA-Au NCs). When aggregated in aqueous media, the MUA-Au NCs showed strong emission, which was weakened by adding ethanol. Interestingly, the suppressed emission was selectively enhanced in the presence of hydrogen sulfide (H2S) because H2S was absorbed onto Au NCs through the strong sulfur-gold bonding affinity. The hydrolyzed H2S, namely, HS, made the Au NCs negatively charged, which aggregated again due to decreased solubility. The H2S-mediated fluorescence enhancement can be further amplified by introducing a hydrophilic thiolate (glutathione, GSH) onto the surface of Au NCs (GSH/MUA-Au NCs), which enabled sensitive determination of H2S. Under the optimized condition, a detection limit of 35 nM was achieved. The determination was not interfered by other anions such as F, Cl, Br, I, OAc, N3 , NO3 , HCO3 , SCN, SO3 2−, and SO4 2−. This excellent sensing performance allowed practical application of the GSH/MUA-Au NC-based sensing platform to accurate determination of H2S in human serum samples. [Figure not available: see fulltext.].

源语言英语
文章编号200
期刊Microchimica Acta
187
4
DOI
出版状态已出版 - 1 4月 2020
已对外发布

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