期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 271, 期 -, 页码 64-72出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.05.116
关键词
Morphology transition; Etching strategy; Colorimetric detection; Localized surface plasmon resonance; Dopamine
资金
- Iranian National Science Foundation (INSF) [96012764]
A simple and sensitive platform was introduced for detection of dopamine (DA) based on morphology transition and etching strategy of hexagonal platelet shaped silver nanoparticles (Ag NPs) functionalized with task-specific ionic liquid (TSIL). In this study, a pyridinium based TSIL was used for surface functionalization. According to the etching strategy, hexagonal TSIL-Ag NPs were converted to round-shape nanoparticles in the presence of DA. This etching process caused a blue shift in the localized surface plasmon resonance (LSPR) peak of TSIL-Ag NPs. The maximum absorption band shifted from 585 nm to 500 nm. Color change from green to red was also observed as a consequence of morphology transition of TSIL-Ag NPs. The color change and change in the A(500)/A(585) ratio versus DA concentration were linear in the range of 0.1-7.5 mu M with a detection limit of 0.031 mu M. Moreover, the developed approach was applied for detection and determination of DA in human serum sample. This simple, rapid and selective method provided a promising sensing probe for detection of DA in biological fluids.
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