Droplet-based microfluidic synthesis of (Au nanorod@Ag)-polyaniline Janus nanoparticles and their application as a surface-enhanced Raman scattering nanosensor for mercury detection
Metal-conducting polymer hybrid nanoparticles (NPs), due to the synergistic effect of metal NPs and polymers, have attracted significant attention and shown versatile applications. In this work, we proposed a simple and quick method for the synthesis of (Au nanorod (NR)@Ag)-polyaniline (PANI) Janus...
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Published in | Analytical methods Vol. 11; no. 31; pp. 3966 - 3973 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
21.08.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Metal-conducting polymer hybrid nanoparticles (NPs), due to the synergistic effect of metal NPs and polymers, have attracted significant attention and shown versatile applications. In this work, we proposed a simple and quick method for the synthesis of (Au nanorod (NR)@Ag)-polyaniline (PANI) Janus nanoparticles (JNPs) with the use of a droplet-based microfluidic platform. Precise control of droplet volumes and reliable manipulation of individual droplets during synthesis enabled the (AuNR@Ag)-PANI JNPs to possess excellent dispersion and uniform size. Moreover, the reaction time for the fabrication of the (AuNR@Ag)-PANI JNPs was largely shortened with such a microfluidic platform. The application of the prepared (AuNR@Ag)-PANI JNPs, which can act as a surface enhanced Raman scattering (SERS) sensor, for the detection of Hg
2+
ions with high sensitivity and good selectivity was demonstrated. This SERS nanosensor displayed a fairly good response to Hg
2+
ions over other possible interfering metal cations, owing to the strong binding affinity between PANI and Hg
2+
ions and causing an increase in the Raman intensity of PANI. A good linear relationship between the Raman intensity increment of PANI and Hg
2+
ion concentration was obtained in the range of 1-150 nM, and the detection limit of Hg
2+
ion concentration was 0.97 nM. Besides, the (AuNR@Ag)-PANI-based SERS nanosensor was successfully applied to the detection of Hg
2+
ions in real water samples. Thus, a facile route for the fabrication of (AuNR@Ag)-PANI JNPs by using a droplet-based microfluidic platform is presented, which have been employed to determine Hg
2+
ions in combination with SERS spectroscopy. We envision that such a droplet-based microfluidic synthesis strategy can provide a new insight into the design and fabrication of novel NPs, which may be applied in various fields, such as catalysis, photovoltaics, bioscience, and environmental science.
Monodisperse anisotropic (AuNR@Ag)-PANI JNPs were synthesized by using a droplet-based microfluidic platform, and show a fairly good response to Hg
2+
ions and have been successfully applied for quantitative analysis of Hg
2+
ions in real water samples. |
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ISSN: | 1759-9660 1759-9679 |
DOI: | 10.1039/c9ay01213c |