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NO2 gas sensing with polyaniline nanofibers synthesized …

Facile synthesis of polyaniline nanofibers/porous carbon microspheres composite for high performance supercapacitors

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KanerPolyaniline nanofibers: facile synthesis and ..

N2 - Known for more than 150 years, polyaniline is the oldest and potentially one of the most useful conducting polymers because of its facile synthesis, environmental stability, and simple acid/base doping/dedoping chemistry. Because a nanoform of this polymer could offer new properties or enhanced performance, nanostructured polyaniline has attracted a great deal of interest during the past few years. This Account summarizes our recent research on the syntheses, processing, properties, and applications of polyaniline nanofibers. By monitoring the nucleation behavior of polyaniline, we demonstrate that high-quality nanofibers can be readily produced in bulk quantity using the conventional chemical oxidative polymerization of aniline. The polyaniline nano-structures formed using this simple method have led to a number of exciting discoveries. For example, we can readily prepare aqueous polyaniline colloids by purifying polyaniline nanofibers and controlling the pH. The colloids formed are self- stabilized via electrostatic repulsions without the need for any chemical modification or steric stabilizer, thus providing a simple and environmentally friendly way to process this polymer. An unusual nanoscale photothermal effect called "flash welding", which we discovered with polyaniline nanofibers, has led to the development of new techniques for making asymmetric polymer membranes and patterned nanofiber films and creating polymer-based nanocomposites. We also demonstrate the use of flash-welded polyaniline films for monolithic actuators. Taking advantage of the unique reduction/oxidation chemistry of polyaniline, we can decorate polyaniline nanofibers with metal nanopartides through in situ reduction of selected metal salts. The resulting polyaniline/metal nanopartide composites show promise for use in ultrafast nonvolatile memory devices and for chemical catalysis. In addition, the use of polyaniline nanofibers or their composites can significantly enhance the sensitivity, selectivity, and response time of polyaniline-based chemical sensors. By combining straightforward synthesis and composite formation with exceptional solution processability, we have developed a range of new useful functionalities. Further research on nanostructured conjugated polymers holds promise for even more exciting discoveries and intriguing applications.

Facile synthesis of high-quality ultralong poly(aniline …

An initiator is applied to synthesize single-walled carbon nanotube/polyaniline composite nanofibers for use as high-performance chemosensors. The composite nanofibers possess widely tunable conductivities (10−4 to 102 S/cm) with up to 5.0 wt % single-walled carbon nanotube (SWCNT) loadings. Chemosensors fabricated from the composite nanofibers synthesized with a 1.0 wt % SWCNT loading respond much more rapidly to low concentrations (100 ppb) of HCl and NH3 vapors compared to polyaniline nanofibers alone (120 s vs 1000 s). These nanofibrillar SWCNT/polyaniline composite nanostructures are promising materials for use as low-cost disposable sensors and as electrodes due to their widely tunable conductivities.

Facile Synthesis of Polyaniline-Polypyrrole Nanofibers …

Facile Rapid Synthesis of Polyaniline (PANI) Nanofibers

AB - Known for more than 150 years, polyaniline is the oldest and potentially one of the most useful conducting polymers because of its facile synthesis, environmental stability, and simple acid/base doping/dedoping chemistry. Because a nanoform of this polymer could offer new properties or enhanced performance, nanostructured polyaniline has attracted a great deal of interest during the past few years. This Account summarizes our recent research on the syntheses, processing, properties, and applications of polyaniline nanofibers. By monitoring the nucleation behavior of polyaniline, we demonstrate that high-quality nanofibers can be readily produced in bulk quantity using the conventional chemical oxidative polymerization of aniline. The polyaniline nano-structures formed using this simple method have led to a number of exciting discoveries. For example, we can readily prepare aqueous polyaniline colloids by purifying polyaniline nanofibers and controlling the pH. The colloids formed are self- stabilized via electrostatic repulsions without the need for any chemical modification or steric stabilizer, thus providing a simple and environmentally friendly way to process this polymer. An unusual nanoscale photothermal effect called "flash welding", which we discovered with polyaniline nanofibers, has led to the development of new techniques for making asymmetric polymer membranes and patterned nanofiber films and creating polymer-based nanocomposites. We also demonstrate the use of flash-welded polyaniline films for monolithic actuators. Taking advantage of the unique reduction/oxidation chemistry of polyaniline, we can decorate polyaniline nanofibers with metal nanopartides through in situ reduction of selected metal salts. The resulting polyaniline/metal nanopartide composites show promise for use in ultrafast nonvolatile memory devices and for chemical catalysis. In addition, the use of polyaniline nanofibers or their composites can significantly enhance the sensitivity, selectivity, and response time of polyaniline-based chemical sensors. By combining straightforward synthesis and composite formation with exceptional solution processability, we have developed a range of new useful functionalities. Further research on nanostructured conjugated polymers holds promise for even more exciting discoveries and intriguing applications.

A new and novel nanocomposite cation exchanger polyaniline-zirconia (PANI-ZrO2) has been synthesized using a chemical oxidative polymerization of aniline by the incorporation of zirconia nanoparticles via three different chemical polymerization pathways. The PANI-ZrO2 composite was examined for its cation exchange property and utilized for the fabrication of supercapacitor electrodes in the symmetric two electrode cell configuration. The aqueous polymerized PANI-ZrO2 composite showed high specific capacitance (387 F g-1) and capacitance retention of up to 81% after 2500 charge-discharge cycles. The excellent electrochemical performance of the composite is mainly attributed to its nanofibrous structure and high electronic conductivity.

Green Synthesis of Novel Polyaniline Nanofibers ..

Polyaniline nanofibers: Facile synthesis ..

Recently we developed a simple, template-free chemical synthesis for polyaniline nanofibers that is selective for nanofibers, can be readily scaled to make large quantities and can be controlled to selectively produce nanofibers with narrow size distributions. Chemical sensors fabricated from polyaniline nanofibers have significantly better performance than conventional material in both sensitivity and time response. The high surface area, small diameter, and porous nature of the nanofiber films allow for facile diffusion of vapors, which is responsible for the enhanced performance. Most recently we have shown that composites with polyaniline are useful to detect analytes that do not give a significant response with unmodified polyaniline. These include fluoroalcohol additives for hydrazine detection and inorganics for hydrogen sulfide detection. Polyaniline nanofibers are superior materials that have excellent potential for many chemical detection applications.

N2 - Recently we developed a simple, template-free chemical synthesis for polyaniline nanofibers that is selective for nanofibers, can be readily scaled to make large quantities and can be controlled to selectively produce nanofibers with narrow size distributions. Chemical sensors fabricated from polyaniline nanofibers have significantly better performance than conventional material in both sensitivity and time response. The high surface area, small diameter, and porous nature of the nanofiber films allow for facile diffusion of vapors, which is responsible for the enhanced performance. Most recently we have shown that composites with polyaniline are useful to detect analytes that do not give a significant response with unmodified polyaniline. These include fluoroalcohol additives for hydrazine detection and inorganics for hydrogen sulfide detection. Polyaniline nanofibers are superior materials that have excellent potential for many chemical detection applications.

Carbon nanotube/polyaniline composite nanofibers: facile synthesis and ..
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  • Polyaniline nanofibers - Wikipedia

    NO 2 gas sensing with polyaniline nanofibers synthesized by a facile aqueous/organic interfacial polymerization

  • Oriented growth of polyaniline nanofiber arrays onto …

    Nanofibers: Facile Synthesis …

  • Oriented growth of polyaniline nanofiber arrays onto the glass and ..

    07/02/2007 · Synthesis Polymerization pathways of polyaniline and polyaniline nanofibers, ..

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Dispersions of Aramid Nanofibers: A New Nanoscale …

This work demonstrated a facile route to the synthesis of polyaniline (PANI) nanofibers by polymerization of aniline using chloroaurate acid (HAuCl4) as the oxidant. The reduction of AuCl4- is accompanied by oxidative polymerization of aniline, leading to uniform PANI nanofibers with a diameter of 35 ± 5 nm and aggregated gold nanoparticles which can precipitate from the liquid phase during the reaction. The resultant PANI nanofibers and gold particles were characterized by means of different techniques, such as UV−vis, FTIR spectroscopy, and scanning and transmission electron microscopy methods. It is found that the gold aggregates are capped with polyaniline, and the conductivity of the fibers is around 0.16 S/cm.

Journal of Nanoscience and Nanotechnology

AB - Recently we developed a simple, template-free chemical synthesis for polyaniline nanofibers that is selective for nanofibers, can be readily scaled to make large quantities and can be controlled to selectively produce nanofibers with narrow size distributions. Chemical sensors fabricated from polyaniline nanofibers have significantly better performance than conventional material in both sensitivity and time response. The high surface area, small diameter, and porous nature of the nanofiber films allow for facile diffusion of vapors, which is responsible for the enhanced performance. Most recently we have shown that composites with polyaniline are useful to detect analytes that do not give a significant response with unmodified polyaniline. These include fluoroalcohol additives for hydrazine detection and inorganics for hydrogen sulfide detection. Polyaniline nanofibers are superior materials that have excellent potential for many chemical detection applications.

Cellulose Chemistry and Technology

Known for more than 150 years, polyaniline is the oldest and potentially one of the most useful conducting polymers because of its facile synthesis, environmental stability, and simple acid/base doping/dedoping chemistry. Because a nanoform of this polymer could offer new properties or enhanced performance, nanostructured polyaniline has attracted a great deal of interest during the past few years. This Account summarizes our recent research on the syntheses, processing, properties, and applications of polyaniline nanofibers. By monitoring the nucleation behavior of polyaniline, we demonstrate that high-quality nanofibers can be readily produced in bulk quantity using the conventional chemical oxidative polymerization of aniline. The polyaniline nano-structures formed using this simple method have led to a number of exciting discoveries. For example, we can readily prepare aqueous polyaniline colloids by purifying polyaniline nanofibers and controlling the pH. The colloids formed are self- stabilized via electrostatic repulsions without the need for any chemical modification or steric stabilizer, thus providing a simple and environmentally friendly way to process this polymer. An unusual nanoscale photothermal effect called "flash welding", which we discovered with polyaniline nanofibers, has led to the development of new techniques for making asymmetric polymer membranes and patterned nanofiber films and creating polymer-based nanocomposites. We also demonstrate the use of flash-welded polyaniline films for monolithic actuators. Taking advantage of the unique reduction/oxidation chemistry of polyaniline, we can decorate polyaniline nanofibers with metal nanopartides through in situ reduction of selected metal salts. The resulting polyaniline/metal nanopartide composites show promise for use in ultrafast nonvolatile memory devices and for chemical catalysis. In addition, the use of polyaniline nanofibers or their composites can significantly enhance the sensitivity, selectivity, and response time of polyaniline-based chemical sensors. By combining straightforward synthesis and composite formation with exceptional solution processability, we have developed a range of new useful functionalities. Further research on nanostructured conjugated polymers holds promise for even more exciting discoveries and intriguing applications.

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