Abstract
Synthesis and application of nanostructured materials applicable in the assembly of electrochemical sensors is one of the important trends in material sciences and analytical chemistry. In this work, we have proposed and implemented simple non-template method for assembling nanofibers from the polyaniline ultrasonicated with phenyliminophenothiazine in aqueous media. Two-step procedure including association with emeraldine dispersion and reorganization under ultrasonication led to formation of nanofibrillar structures with average diameter of 20 nm. UV-spectroscopy confirms that association of phenyliminophenothiazine and polyaniline in acidic medium resulted in an intense absorption band at 900–910 nm due to donor-acceptor interaction between the reactants. The material combined emeraldine charge transmission with redox activity of phenyliminophenothiazine was found promising for electrochemical sensing. It was confirmed by comparison of characteristics of appropriate solid-contact sensors based on emeraldine and phenyliminophenothiazine toward Fe(III) ions, ascorbic acid and hydroquinone. In all the cases, the use of phenyliminophenothiazine results in a wider concentration range and more reproducible signal against characteristics of similar sensor based on polyaniline. The applicability of the sensor was confirmed by determination of iron content in commercial medication.
Highlights
Growing technological applications of electroactive polymers keep the development and improvement of appropriate materials as one of the most important challenges
We propose a simple one-stage method for the preparation of polyaniline nanofibers by conventional oxidative polymerization, which provides self-assembling of polyaniline nanofibers by sonication of the associates formed by emeraldine and phenyliminophenothiazine (PTZANI)
The formation of the target product, PTZANI, in the above reaction was confirmed by Gas chromatography–mass spectrometry (GC–MS) using the reaction mixture washed with aqueous ammonia and water to remove excess of p-toluenesulfonic acid and inorganic impurities (Supporting Information)
Summary
Growing technological applications of electroactive polymers keep the development and improvement of appropriate materials as one of the most important challenges. Such one-dimensional nanostructures are widely used in electroactive composite materials due to high specific surface area, stability in colloid systems and ability to form extended structures[1] These properties are demanded in sensor development and in nanophotonics as elements commensurate with the wavelength of a visible light[2]. Large surface area maintains an interest in such materials in gas sensing[3] and liquids analysis[4] Among variety of such materials, emeraldine, a semi-oxidized form of polyaniline, is most attractive due to easy preparation, low toxicity and low electric resistance[5]. The nanofibers obtained exerted a high absorption band in near IR region (900–910 nm) attributed to the donor-acceptor interaction with the charge transfer It was shown on the example of model antioxidants and Fe(III) ions that PTZANI can be utilized as sensing element in the electrochemical sensors intended for monitoring redox properties of various species.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
