Issue 31, 2019

Droplet-based microfluidic synthesis of (Au nanorod@Ag)–polyaniline Janus nanoparticles and their application as a surface-enhanced Raman scattering nanosensor for mercury detection

Abstract

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 Hg2+ ions with high sensitivity and good selectivity was demonstrated. This SERS nanosensor displayed a fairly good response to Hg2+ ions over other possible interfering metal cations, owing to the strong binding affinity between PANI and Hg2+ ions and causing an increase in the Raman intensity of PANI. A good linear relationship between the Raman intensity increment of PANI and Hg2+ ion concentration was obtained in the range of 1–150 nM, and the detection limit of Hg2+ ion concentration was 0.97 nM. Besides, the (AuNR@Ag)–PANI-based SERS nanosensor was successfully applied to the detection of Hg2+ 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 Hg2+ 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.

Graphical abstract: Droplet-based microfluidic synthesis of (Au nanorod@Ag)–polyaniline Janus nanoparticles and their application as a surface-enhanced Raman scattering nanosensor for mercury detection

Article information

Article type
Paper
Submitted
06 شوال 1440
Accepted
09 ذو القعدة 1440
First published
09 ذو القعدة 1440

Anal. Methods, 2019,11, 3966-3973

Droplet-based microfluidic synthesis of (Au nanorod@Ag)–polyaniline Janus nanoparticles and their application as a surface-enhanced Raman scattering nanosensor for mercury detection

Y. Wang, M. Shang, Y. Wang and Z. Xu, Anal. Methods, 2019, 11, 3966 DOI: 10.1039/C9AY01213C

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