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Experimental and Computational Study of the Effect of Temperature on the electro-polymerization Process of Thiophene

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Open Journal of Organic Polymer Materials 2013年第3期3卷 59-67页

作者： María Belén Camarada MRomero MCGiménez WSchmickler MAdel Valle Lab.electroquímica de Polímeros Departamento de Química InorgánicaFacultad de QuímicaPontificia Universidad Católica ChileAv.Vicuna MackennaSantiagoChile Nanobiotechnology Division at University of Talca Fraunhofer Chile Research Foundation-Center for Systems BiotechnologyFCR-CSBTalcaChile FEG FaMAFUniversidad Nacional de CórdobaCórdobaArgentina Department of Theoretical Chemistry Ulm UniversityUImGermany

Temperature effect on the nucleation and growth mechanisms (NGM) of poly(thiophene) (PTh) was investigated through experimental and computational tools. The computational simulation method was based on a kinetic Monte Carlo algorithm. It reproduced key processes such as diffusion, oligomerization, and the precipitation of oligomers onto the electrode surface. electrochemical synthesis conditions at temperatures between 263 and 303 K were optimized. The deconvolution of the i-t transients reflected two contributions: a progressive nucleation with three-dimensional growth controlled by diffusion and the other by charge transfer, PN3Ddif and PN3Dct, respectively. As temperature decreased, a diminution of the charge associated to each contribution was observed and the nucleation induction time increased. Experimental and computational evidence indicated that temperature does not change the nucleation and growth mechanism (NGM). This effect was ascribed to kinetic factors rather than to film conductivity. This work contrasts simulation and experimental evidence and demonstrates how computational simulations can help to understand the electrochemical process of conducting polymers formation.

关键词： Kinetic Monte Carlo Conducting Polymers Thiophene electro-polymerization Nucleation and Growth Mechanism

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Sensitive and selective molecularly imprinted electrochemical sensor based on multi-walled carbon nanotubes for doxycycline hyclate determination

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Chinese Chemical Letters 2020年第1期31卷 185-188页

作者： Zeyu Xu Xingxing Jiang Shuping Liu Minghui Yang Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety College of Chemistry and Chemical EngineeringCentral South University

An electrochemical sensor for doxycycline hyclate(DC)detection with high sensitivity and good selectivity is *** sensor was fabricated by electro-polymerization of molecularly imprinted polymers(MIPs)in the presence of DC onto multi-walled carbon nanotubes modified glassy carbon electrode(MWCNTs/GCE).The MWCNTs can significantly increase the current response of the sensor,leading to enhanced *** MIPs provide selective recognition sites for DC *** experimental parameters,such as the polymer monomer concentration,supporting electrolyte pH,the time for electro-polymerization and the incubation time of the sensor with DC were *** optimized experimental conditions,the sensor displayed a linear range of 0.05μmol/L-0.5μmol/L towards DC detection,with the detection limit of 1.3×10^-2μmol/*** sensor was successfully applied for recovery test of DC in human serum samples.

关键词： electrochemical sensor Doxcycline hyclate Molecularly imprinted polymers Multi-walled carbon nanotubes electro-polymerization

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Molecularly imprinted electrochemical sensor for daizein recognition and detection based on poly(sodium 4-styrenesulfonate) functionalized graphene

Molecularly imprinted electrochemical sensor for daizein rec...

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河南省化学会2016年学术年会

作者： Yiming Liang Ran Yang Lingbo Qu Jianjun Li College of Chemistry and Molecular Engineering Zhengzhou University

A sensitive and selectivity electrochemical sensor of daidzein based on Poly(sodium 4-styrenesulfonate)-reduced graphene oxide(PSS-r GO) and molecular imprinted polymer(MIP)modified glassy carbon electrode(GCE) was established. The MIPs was synthesized on the surface of PSS-r GO modified electrode by in situ electro-polymerized of o-phenylenediamine(o-PD) in the presence of template daidzein via cyclic voltammetry(CV). The benzene rings structure and negatively charged PSS-r GO units provide strong π-π stacking effect and electrostatic interaction between PSS-r GO and daidzein and o-PD which makes not only the compact imprinted film, but also the excellent properties of MIPs such as more imprint sites and higher recognition for target molecule. With[Fe(CN)]/[Fe(CN)]/ as a probe for signal transduction, a electrochemical impedance method for determination of daidzein was developed. Under the optimum conditions, the peak current of[Fe(CN)]/[Fe(CN)]/ has a linear relationship with the concentration of daidzein over the range 1-20.0 nM. The limit of detection was calculated as 0.8 nM. Relative to the other the fabricated sensor showed 6.5 and 7.9 times higher affinity for daidzein than for structurally similar isoflavones, puerarin,and genstein. Furthermore, common metal ions and biological matrices had no influence on the modified electrode, the proposed method could be successfully applied for the determination of daidzein in biological samples.

关键词： molecularly imprinted polymer daidzein Poly(sodium 4-styrenesulfonate) electro-polymerization

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