期刊
ANALYTICA CHIMICA ACTA
卷 747, 期 -, 页码 92-98出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.08.019
关键词
Colorimetric sensor; Melamine; Silver nanoparticles; Oxidative etching-aggregation
资金
- The National Natural Science Foundation of China [21005031, 20903048]
- Fundamental Research Funds for the Central Universities [JUSRP21113]
- Opening Foundation of the State Key Laboratory of Materials-Oriented Chemical Engineering [KL10-08]
An innovative and versatile functional colorimetric sensor for melamine (MA) and H2O2 was developed with simplicity, excellent selectivity and ultrasensitivity. The detection mechanism was based on the oxidative etching-aggregation of silver nanoparticles (AgNPs) by the cooperation effect of MA and electron acceptors such as H2O2. ozone or Fe(NO3)(3). The detection limits of this method for MA could reach as low as 0.08 nM, 0.16 nM and 3 nM when H2O2, ozone or Fe(NO3)(3) was used as an electron acceptor, respectively. When using H2O2 as a typical electron acceptor, the method enabled the detection of H2O2 with a detection limit of 0.2 nM. This proposed method offered a new way to design MA and H2O2 sensors and might be easily extended to detect other nucleophilic reagents and electron acceptors based on colorimetric sensors. (C) 2012 Elsevier B.V. All rights reserved.
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