High Performance Zinc Oxide Nanorod-Doped Ion Imprinted Polypyrrole for the Selective Electrosensing of Mercury II Ions
Zouhair Ait‐TouchenteHoussem Eddine El Yamine SakhraouiNajla FouratiChouki ZerroukiNaima MaoucheNourdin YaakoubiRachid TouzaniMohamed M. Chehimi
8
Citation
59
Reference
10
Related Paper
Citation Trend
Abstract:
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.Keywords:
Polypyrrole
Nanorod
Photoresist
Pyrrole
Polypyrrole
Pyrrole
Perchlorate
Base (topology)
Carbon fibers
Cite
Citations (26)
Conducting polypyrrole (PPy) films are prepared by mixing a solution of pyrrole with an oxidizing solution of FeCl3. UV-VIS and IR spectroscopy are used for determining the reaction mechanisms. The rate of pyrrole polymerization is determined by the rate of the initial electron-transfer reaction. The surface morphology is investigated with SEM.
Polypyrrole
Pyrrole
Oxidizing agent
Cite
Citations (26)
Polypyrrole
Pyrrole
Chemical structure
Cite
Citations (214)
Background: We previously reported that polypyrrole microtubes (ca. 10 and 0.4 µm in length and diameter, respectively) form on the surface of working electrode during the electrochemical polymerization of pyrrole without any shape-guiding template. However, the influence of supporting salt to the shape of the mocrostructure during the electrochemical polymerization of pyrrole was not well studied. Keywords: Conductive polymer, microtube, polypyrrole, spontaneous formation, supporting salt.
Polypyrrole
Pyrrole
Cite
Citations (0)
Polypyrrole
Pyrrole
Deposition
Cite
Citations (42)
Highly stable, flexible films of polypyrrole with p-type conductivities of 100 Ω–1 cm–1 have been prepared by electrolytic oxidation of the appropriate pyrrole monomers; similarly prepared films of mixtures of pyrrole and N-methylpyrrole have conductivities between 5 × 10–3 and 100 Ω–1 cm–1 depending upon the composition.
Polypyrrole
Pyrrole
Cite
Citations (422)
Angular dependent XPS technique combined with in situ heating method was used to study the chemical and aggregational structure of polypyrrole films prepared by electrochemical polymerization. The results show that the relative concentration for various atoms within the surface region decreases in the order of C OS N.There are at least two inequivalent N heteroatoms,i.e.the pyrrole N and the oxidized pyrrole N atoms. The polypyrrole chains are not degraded by heating the polypyrrole films at 200℃ in vacuum. The anions, however, move to the top surface region during heating, and a decrease in the oxidized N heteroatoms is observed after heating.
Polypyrrole
Heteroatom
Pyrrole
Cite
Citations (0)
Polypyrrole/nylon-6 composite fiber can be prepared by in-situ polymerization in pyrrole-aqueous solution . The effects of various parameters during the processing on the fiber conductivity were investigated in the paper. The results show that FeCl3·6H2O can be used as an effective oxidant and the optimal reaction conditions for excellent conducting performance are as follow: pyrrole concentration 0.05 mol/L, the initial mole ratio of oxidant/pyrrole 2.3, reaction temperature 20 ℃ and reaction time 3 h. The SEM photos show that the composite fiber presents skin-core structure and polypyrrole concentrates on the skin which forms conducting passage.
Polypyrrole
Pyrrole
Cite
Citations (1)
Abstract Pyrrole can be easily polymerized to produce polypyrrole by using an AlCl3–CuCl–O2 cayalytic system. The yield of polypyrrole was very high and more than 600% based on the amount of CuCl used. The conductivity of the pressed polypyrrole was 10−2 S cm−1.
Pyrrole
Cite
Citations (19)
Generally, the electrochemical oxidation of pyrrole results in polypyrrole film in its doped conducting form. In this paper, it is shown that, in the presence of weak-acidic anions, pyrrole electro-oxidation leads to the formation of a very thin nonconducting overoxidized polypyrrole film. This phenomenon is due to the release of protons at the electrode/electrolyte interface during pyrrole oxidation. XPS analyses confirm (i) the film does not contain doping anions and (ii) the presence of carbonyl bonds; both features are characteristic of overoxidized polypyrrole.
Polypyrrole
Pyrrole
Supporting electrolyte
Cite
Citations (34)