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Synthesis and Application of Ion‐Imprinted Nanoparticles in Electrochemical Sensors for Copper (II) Determination
Author(s) -
Di Masi Sabrina,
Garcia Cruz Alvaro,
Canfarotta Francesco,
Cowen Todd,
Marote Pedro,
Malitesta Cosimino,
Piletsky Sergey A.
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900056
Subject(s) - detection limit , materials science , differential pulse voltammetry , molecularly imprinted polymer , copper , dynamic light scattering , electrochemical gas sensor , nanoparticle , electrochemistry , scanning electron microscope , voltammetry , colloidal gold , cyclic voltammetry , analytical chemistry (journal) , polymer , electrode , nuclear chemistry , chemical engineering , nanotechnology , selectivity , chemistry , chromatography , metallurgy , catalysis , composite material , organic chemistry , engineering
Abstract We report here the synthesis and characterisation of ion imprinted polymers nanoparticles (nanoIIPs) and their application as electrochemical sensors for Cu 2+ ions determination. Imprinted nanoparticles were developed following a free radical polymerisation in water and subsequently immobilised on the surface of gold screen printed electrodes (SPAuE). Characterisation of nanoIIPs was performed using dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical determination of Cu 2+ was achieved in water samples using differential pulse voltammetry (DPV). Voltammetric responses demonstrate different current responses for copper(II)‐imprinted polymers nanoparticles (Cu‐nanoIIPs) and non‐imprinted polymer nanoparticles. The nanoIIPs sensor responds to copper (II) in a linear range between 1.9 and 61 nM, with a sensitivity of 0.0618 μA nM −1 . The limit of detection (LOD) and limit of quantification (LOQ) of the electrochemical sensor tested in buffer solution were 74 pM and 247 pM, respectively. Furthermore, the sensor presents high selectivity when tested against other ions such as Ni 2+ , Zn 2+ , NO 3 − , and CrO 4 2− , and it is potentially suitable for environmental monitoring of heavy metals and food control. The sensor responses were also successfully evaluated in spiked commercialised drinking water.