期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 1, 页码 49-56出版社
AMER CHEMICAL SOC
DOI: 10.1021/am405157k
关键词
metal ions; pattern recognition; sensor array; self-assembled monolayer; interface
资金
- National Natural Science Foundation of China [21173142, 20927001]
- Shaanxi Provincial Department of Science and Technology [2010K01-112, 2011KJXX48]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1070]
- Fundamental Research Funds for the Central Universities [GK201301006]
A dansyl-functionalized fluorescent film sensor was specially designed and prepared by assembling dansyl on a glass plate surface via a long flexible spacer containing oligo(oxyethylene) and amine units. The chemical attachment of dansyl moieties on the surface was verified by contact angle, XPS, and fluorescence measurements. Solvent effect examination revealed that the polarity-sensitivity was retained for the surface-confined dansyl moieties. Fluorescence quenching studies in water declared that the dansyl-functionalized SAM possesses a higher sensitivity towards Hg2+ and Cu2+ than the other tested divalent metal ions including Zn2+, Cd2+, Co2+, and Pb2+. Further measurements of the fluorescence responses of the film towards Cu2+ and Hg2+ in three solvents including water, acetonitrile, and THF evidenced that the present film exhibits cross-reactive responses to these two metal ions. The combined signals from the three solvents provide a recognition pattern for both metal ions at a certain concentration and realize the identification between Hg2+ and Cu2+. Moreover, using principle component analysis, this method can be extended to identify metal ions that are hard to detect by the film sensor in water such as Co2+ and Ni2+.
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