1,721,053 research outputs found
Nucleation and Growth of Copper particles on Pt and Pt/Poly-3-Methylthiophene Modified Electrode in Presence of Cl- Complexing Agent
No full textThe kinetics of electrochemical deposition of copper particles from Cu2+ solution on platinum and poly-3-
methylthiophene modified platinum electrode was studied in potentiostatic conditions in presence of Cl−
anions. The complex behavior of current transients suggests that the deposition process involves several
stages with different kinetics. Results obtained on platinum show that after an initial adsorption process,
the copper deposition is accomplished through two different models: a three-dimensional nucleation
and growth under diffusive control (3DPD model) and a progressive nucleation and two-dimensional
growth (2DP model). The analysis of current transients recorded on platinum poly-3-methylthiophene
modified electrode (Pt/PMT) shows a very different behavior. On Pt modified electrode a process of growth
related to a semi-infinite diffusion to a planar surface was accompanied by two different mechanisms
of nucleation and growth: a three-dimensional nucleation and growth with no diffusive control (3DP
model) and an instantaneous nucleation with two-dimensional growth (2DP model)
Electrochemical sensing of macromolecules based on molecularly imprinted polymers: challenges, successful strategies, and opportunities
No full textLooking at the literature focused on molecularly imprinted polymers (MIPs) for protein, it soon becomes apparent that a remarkable increase in scientific interest and exploration of new applications has been recorded in the last several years, from 42 documents in 2011 to 128 just 10 years later, in 2021 (Scopus, December 2021). Such a rapid threefold increase in the number of works in this field is evidence that the imprinting of macromolecules no longer represents a distant dream of optimistic imprinters, as it was perceived until only a few years ago, but is rapidly becoming an ever more promising and reliable technology, due to the significant achievements in the field. The present critical review aims to summarize some of them, evidencing the aspects that have contributed to the success of the most widely used strategies in the field. At the same time, limitations and drawbacks of less frequently used approaches are critically discussed. Particular focus is given to the use of a MIP for protein in the assembly of electrochemical sensors. Sensor design indeed represents one of the most active application fields of imprinting technology, with electrochemical MIP sensors providing the broadest spectrum of protein analytes among the different sensor configurations. Graphical abstract: [Figure not available: see fulltext.
Molecularly imprinted electrosynthesised polymers: new materials for biomimetic sensors
No full textThe preparation and characterization of electrosynthesized
poly(o-phenylenediamine) (PPD) imprinted by glucose
(iPPD) is reported as the first case of an electrosynthesized
polymer molecularly imprinted by a neutral template.
The material is employed as the recognition element
of a QCM biomimetic sensor for glucose. Scatchard
analysis of the relevant calibration curve offers information
on the equilibrium and binding sites involved in glucose
detection. XPS comparison of PPD and iPPD supports
the occurrence of a templating effect. On this basis,
molecular imprinting electropolymerization is proposed
as a possible strategy for the preparation of new materials
with molecular recognition properties to be applied in
biomimetic sensors
Enzyme-Mimics Molecularly Imprinted Polymers Based on Metal Complexes: Electropolymerization and Electrocatalytic Application
No full textThe development of an electrosynthesized molecularly imprinted polymer (MIP) based on a metal complex is here reported as an effective strategy for combining advantages coming from metal-ion coordination and catalytic capabilities of metallic centers with ones deriving from electropolymerization. Metal ion coordination combines the flexibility of noncovalent imprinting approaches with the strength and specificity of covalent ones representing an attractive binding mechanism in MIP design for the recognition of a vast array of analytes. In addition, such a MIP possesses catalytic properties other than recognition capability, which is not so common in MIP field. On the other hand, electropolymerization represents a highly successful way of easily anchoring MIP-based sensing layers to the transducer surface. Procedures for MIP electrosynthesis as well as for its analytical application in electrocatalytic sensing are described
Ti and Fe speciation by XPS and Mössbauer spectroscopy for a full crystal chemical characterisation of Ti-garnets from Colli Albani (Italy)
No full text
Ti Fe speciation by XPS and Mössbauer spectroscopy for a full crystal chemical characterisation of Ti-garnets from Colli Albani (Italy)
No full textSpectroscopic investigation on polymer films obtained by oxidation of o-phenylenediamine on platinum electrodes at different pHs.
No full textGlucose fast-response amperometric sensor based on glucose oxidase immobilized in an electropolymerized poly(o-phenylenediamine) film.
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