Design of Novel Electrochemical Sensors for the Selective Detection of Glyphosate

Mazouz, Zouhour; Touchente, Zouhair Ait; Laradi, Houria; Fourati, Najla; Yaakoubi, Nourdin; Touzani, Rachid; Chehimi, Mohamed M.; Kalfat, Rafik; Othmane, Ali; Zerrouki, Chouki

doi:10.3390/proceedings1040483

Cited by 8 publications

(6 citation statements)

References 6 publications

(6 reference statements)

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“…The atomic force microscopy (AFM) measurements have been carried out in order to monitor the topographic changes after each surface functionalization step. The evidence of nanorod growth is not the purpose herein, that being clearly shown in a previous work [55]. Therefore, we can use a standard tapping mode AFM probes inst ead of high aspect ratio ones.…”

Section: Topographical Characterizationmentioning

confidence: 86%

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

Ait-Touchente¹,

Sakhraoui²,

Fourati³

et al. 2020

Preprint

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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 chelatant agent and Hg(II) (template). Hg(II)-imprinted polypyrrole (PPy) was also prepared on 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, however in the absence of any Hg2+ template. The strategy combining diazonium salt modification and ZnO nanorod decoration of gold electrodes permitted to increase considerably the specific surface and thus to improve the sensor performances. The limit of detection (LOD) of the designed sensor was ~1 pM, the lowest value ever reported in literature. 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. The Au-ZnO-IIP was found to be highly selective towards Hg(II) 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 enhance environmental quality.

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Section: Topographical Characterizationmentioning

confidence: 86%

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

Ait-Touchente¹,

Sakhraoui²,

Fourati³

et al. 2020

Preprint

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“…Besides the central role of diazonium modification of the working electrode for the growth of vertically aligned ZnO nanorods, such surface chemistry ensures robust adhesion of the polypyrrole sensing layer [65]. This strategy of gathering the salient features of diazonium salts, ZnO nanorods and ion imprinting of polypyrrole has never been reported before, with the exception of our short proceedings papers [63,64]. We believe it has much to offer to the surface scientist in the quest of constructing a robust electrochemical sensor to address environmental issues.…”

Section: Introductionmentioning

confidence: 85%

“…In two recent conference proceedings [63,64], we have proposed to combine the advantage of diazonium surface modification for the vertical growth of ZnO nanorods and sensing properties of polypyrrole. In this follow-up, we provide an in-depth study targeting the ultimate detection limit using ZnO nanorod-embedded ion imprinted polypyrrole.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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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“…Glyphosate has been reported to be detected using bare and modified electrodes made of gold [28,[37][38][39][40][41][42][43][44], copper [45][46][47], carbon [48][49][50][51][52][53][54], mercury [55][56][57], and platinum [58,59]. Electrochemical methods, type of electrodes, analytical performance, measurement condition, and sample matrix for glyphosate determination are summarized in Table 1.…”

Section: Electrochemical Detection Of Glyphosatementioning

confidence: 99%

Recent Development on the Electrochemical Detection of Selected Pesticides: A Focused Review

Noori¹,

Mortensen

Geto³

2020

Sensors

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Pesticides are heavily used in agriculture to protect crops from diseases, insects, and weeds. However, only a fraction of the used pesticides reaches the target and the rest slips through the soil, causing the contamination of ground-and surface water resources. Given the emerging interest in the on-site detection of analytes that can replace traditional chromatographic techniques, alternative methods for pesticide measuring have recently encountered remarkable attention. This review gives a focused overview of the literature related to the electrochemical detection of selected pesticides. Here, we focus on the electrochemical detection of three important pesticides; glyphosate, lindane and bentazone using a variety of electrochemical detection techniques, electrode materials, electrolyte media, and sample matrix. The review summarizes the different electrochemical studies and provides an overview of the analytical performances reported such as; the limits of detection and linearity range. This article highlights the advancements in pesticide detection of the selected pesticides using electrochemical methods and point towards the challenges and needed efforts to achieve electrochemical detection suitable for on-site applications.

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Design of Novel Electrochemical Sensors for the Selective Detection of Glyphosate

Cited by 8 publications

References 6 publications

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

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

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

Recent Development on the Electrochemical Detection of Selected Pesticides: A Focused Review

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