An extraordinarily sensitive voltammetric sensor with picomolar detection limit for Pb 2+  determination based on carbon paste electrode impregnated with nano-sized imprinted polymer and multi-walled carbon nanotubes

Alizadeh, Taher; Hamidi, Negin; Ganjali, M. R.; Rafiei, Faride

doi:10.1016/j.jece.2017.08.009

Cited by 38 publications

(18 citation statements)

References 34 publications

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“…A very sensitive voltammetric sensor with picomolar detection limit, based on carbon paste electrode impregnated with nano sized IIP was described by Alizadeh et al [86]. As for the previous example, also here, the use of MWCNT allowed to improve the sensor performances showing a synergic effect with the biomimetic recognition layer.…”

Section: Leadmentioning

confidence: 68%

Bio- and Biomimetic Receptors for Electrochemical Sensing of Heavy Metal Ions

Stortini

Baldo

Moro

et al. 2020

Sensors

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Heavy metals ions (HMI), if not properly handled, used and disposed, are a hazard for the ecosystem and pose serious risks for human health. They are counted among the most common environmental pollutants, mainly originating from anthropogenic sources, such as agricultural, industrial and/or domestic effluents, atmospheric emissions, etc. To face this issue, it is necessary not only to determine the origin, distribution and the concentration of HMI but also to rapidly (possibly in real-time) monitor their concentration levels in situ. Therefore, portable, low-cost and high performing analytical tools are urgently needed. Even though in the last decades many analytical tools and methodologies have been designed to this aim, there are still several open challenges. Compared with the traditional analytical techniques, such as atomic absorption/emission spectroscopy, inductively coupled plasma mass spectrometry and/or high-performance liquid chromatography coupled with electrochemical or UV–VIS detectors, bio- and biomimetic electrochemical sensors provide high sensitivity, selectivity and rapid responses within portable and user-friendly devices. In this review, the advances in HMI sensing in the last five years (2016–2020) are addressed. Key examples of bio and biomimetic electrochemical, impedimetric and electrochemiluminescence-based sensors for Hg2+, Cu2+, Pb2+, Cd2+, Cr6+, Zn2+ and Tl+ are described and discussed.

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Section: Leadmentioning

confidence: 68%

Bio- and Biomimetic Receptors for Electrochemical Sensing of Heavy Metal Ions

Stortini

Baldo

Moro

et al. 2020

Sensors

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“…The sensor sensitivity, computed from the slope at the origin of current/concentration curves (i.e., at lower concentrations), was in the order of 0.692 ± 0.034 μA.pM -1 . This value shows that this LCys-PPy sensor prepared on Au-ZnO to capture mercury is very sensitive compared to several sensors intended to detect heavy metals [84][85][86]. In addition to these interesting metrological features, we also tested the selectivity of the sensor by comparing the recognition of the targeted Hg 2+ to lead, cadmium and copper ions.…”

Section: Electrochemical Sensing Of Mercurymentioning

confidence: 94%

High Performance Zinc Oxide Nanorod-Doped Ion Imprinted Polypyrrole for the Selective Electrosensing of Mercury II Ions

et al. 2020

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A biomimetic, ion-imprinted polymer (IIP) was prepared by electropolymerization of pyrrole at the surface of gold electrodes decorated with vertically grown ZnO nanorods. The vertical growth of the nanorods was achieved via an ultrathin aryl monolayer grafted by reduction of diazonium salt precursor. Pyrrole was polymerized in the presence of L-cysteine as chelating agent and Hg2+ (template). Hg2+-imprinted polypyrrole (PPy) was also prepared on a bare gold electrode in order to compare the two methods of sensor design (Au-ZnO-IIP vs. Au-IIP). Non-imprinted PPy was prepared in the same conditions but in the absence of any Hg2+ template. The strategy combining diazonium salt modification and ZnO nanorod decoration of gold electrodes permitted us to increase considerably the specific surface area and thus improve the sensor performance. The limit of detection (LOD) of the designed sensor was ~1 pM, the lowest value ever reported in the literature for gold electrode sensors. The dissociation constants between PPy and Hg2+ were estimated at [Kd1 = (7.89 ± 3.63) mM and Kd2 = (38.10 ± 9.22) pM]. The sensitivity of the designed sensor was found to be 0.692 ± 0.034 μA.pM-1. The Au-ZnO-IIP was found to be highly selective towards Hg2+ compared to cadmium, lead and copper ions. This sensor design strategy could open up new horizons in monitoring toxic heavy metal ions in water and therefore contribute to enhancing environmental quality.

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“…This study proposed a convenient and efficient imprinting strategy with great potential application value in designing other PDA-based MIP sensors. Other nanomaterials, such as metal NPs and transition metal complexes, can be efficiently modified on CNT surfaces to obtain composite nanomaterials, which can improve the detection performance of biomimetic sensors in food samples [98,99,100,101]. Fu et al were the first to electropolymerize Hg 2+ imprinting poly (2-mercaptobenzothiazole) films on the GCE surface modified by AuNPs and SWCNT nanohybrids for electrochemical detection of Hg 2+ [102] (Figure 4a).…”

Section: Carbon-based Nanomaterialsmentioning

confidence: 99%

Carbon-Based Nanomaterials in Sensors for Food Safety

et al. 2019

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Food safety is one of the most important and widespread research topics worldwide. The development of relevant analytical methods or devices for detection of unsafe factors in foods is necessary to ensure food safety and an important aspect of the studies of food safety. In recent years, developing high-performance sensors used for food safety analysis has made remarkable progress. The combination of carbon-based nanomaterials with excellent properties is a specific type of sensor for enhancing the signal conversion and thus improving detection accuracy and sensitivity, thus reaching unprecedented levels and having good application potential. This review describes the roles and contributions of typical carbon-based nanomaterials, such as mesoporous carbon, single-or multi-walled carbon nanotubes, graphene and carbon quantum dots, in the construction and performance improvement of various chemo-and biosensors for various signals. Additionally, this review focuses on the progress of applications of this type of sensor in food safety inspection, especially for the analysis and detection of all types of toxic and harmful substances in foods.

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An extraordinarily sensitive voltammetric sensor with picomolar detection limit for Pb 2+ determination based on carbon paste electrode impregnated with nano-sized imprinted polymer and multi-walled carbon nanotubes

Cited by 38 publications

References 34 publications

Bio- and Biomimetic Receptors for Electrochemical Sensing of Heavy Metal Ions

Bio- and Biomimetic Receptors for Electrochemical Sensing of Heavy Metal Ions

High Performance Zinc Oxide Nanorod-Doped Ion Imprinted Polypyrrole for the Selective Electrosensing of Mercury II Ions

Carbon-Based Nanomaterials in Sensors for Food Safety

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