Metal nanoparticles exhibit Localized Surface Plasmon Resonance (LSPR) and this property is widely used for chemical and biological sensing. The colour of nanoparticles is strictly connected with LSPR and depends on shape, dimensions, capping agent and refractive index of the medium in which nanoparticles are dispersed. In this sense a change in LSPR absorption correspond to a colour change of nanoparticles solutions and this feature can be exploit for colorimetric sensors. [1,2] In this study we report a simple method for synthetize different types of silver nanoparticles (AgNPs) that were largely characterized by UV-Vis spectroscopy, Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS). Sizes and shapes of AgNPs were controlled by using PVP, Sodium Citrate and NaBH4 as reducing agent, by varying the concentrations of H2O2 showing changes in colour of nanoparticles solutions. The colours of nanoparticles varied from yellow to blue and finally to green. From SEM analysis the different colour was associated to different shape that varied from nanospheres, nanoprism, nanorods, and hexagons. In particular, blue AgNPs were used as sensor for different concentration of Mercury ion (Hg2+). In fact, these nanoparticles were able to discriminate Hg2+ from other metals in the aqueous solution with high selectivity demonstrated by specific LSPR blue shift from 620 nm where a change of 1 nm corresponded to 0.029 nM of Hg2+.

Silver nanoparticles plasmonic sensor for the detection of mercury ions (Hg2+) in aqueous medium.

M. Zannotti
Primo
;
R. Giovannetti
Secondo
;
S. Ferraro
2019-01-01

Abstract

Metal nanoparticles exhibit Localized Surface Plasmon Resonance (LSPR) and this property is widely used for chemical and biological sensing. The colour of nanoparticles is strictly connected with LSPR and depends on shape, dimensions, capping agent and refractive index of the medium in which nanoparticles are dispersed. In this sense a change in LSPR absorption correspond to a colour change of nanoparticles solutions and this feature can be exploit for colorimetric sensors. [1,2] In this study we report a simple method for synthetize different types of silver nanoparticles (AgNPs) that were largely characterized by UV-Vis spectroscopy, Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS). Sizes and shapes of AgNPs were controlled by using PVP, Sodium Citrate and NaBH4 as reducing agent, by varying the concentrations of H2O2 showing changes in colour of nanoparticles solutions. The colours of nanoparticles varied from yellow to blue and finally to green. From SEM analysis the different colour was associated to different shape that varied from nanospheres, nanoprism, nanorods, and hexagons. In particular, blue AgNPs were used as sensor for different concentration of Mercury ion (Hg2+). In fact, these nanoparticles were able to discriminate Hg2+ from other metals in the aqueous solution with high selectivity demonstrated by specific LSPR blue shift from 620 nm where a change of 1 nm corresponded to 0.029 nM of Hg2+.
2019
978-88-94952-10-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/452978
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