Synthesis of Polyaniline Nanofibers by “Nanofiber …

Polyaniline nanofibers - Revolvy

Polyaniline nanofibers | Wiki | Everipedia

2. Chemical Sensors
The development of high-performance chemical sensors is receiving increased interest due to its importance in environmental protection and homeland security. We have demonstrated that polyaniline nanofibers exhibit superior sensing performance compared to bulk films, indicating that conducting polymer nanofibers are good candidates for chemical sensing. A systematic investigation into the response of conducting polymer nanofibers to a series of toxic industrial gases and chemical is currently under investigation.

A detailed study is conducted on the influence of a variety of synthetic conditions on the morphology of the polyaniline nanostructure.

Spectroscopy of Polyaniline Nanofibers | InTechOpen

AB - Nanofibers with diameters of tens of nanometers appear to be an intrinsic morphological unit that was found to "naturally" form in the early stage of the chemical oxidative polymerization of aniline. In conventional polymerization, nanofibers are subject to secondary growth of irregularly shaped particles, which leads to the final granular agglomerates. The key to producing pure nanofibers is to suppress secondary growth. Based on this, two methods-interfacial polymerization and rapidly mixed reactions-have been developed that can readily produce pure nanofibers by slightly modifying the conventional chemical synthesis of polyaniline without the need for any template or structural directing material. With this nanofiber morphology, the dispersibility and processibility of polyaniline are now much improved. The nanofibers show dramatically enhanced performance over conventional polyaniline applications such as in chemical sensors. They can also serve as a template to grow inorganic/polyaniline nanocomposites that lead to exciting properties such as electrical bistability that can be used for nonvolatile memory devices. Additionally, a novel flash welding technique for the nanofibers has been developed that can be used to make asymmetric polymer membranes, form patterned nanofiber films, and create polymer-based nanocomposites based on an enhanced photothermal effect observed in these highly conjugated polymeric nanofibers.

Synthesis and characterization of conductive polyaniline ..

3. Memory Devices and High Density Electronics (in Collaboration with Prof. Yang Yang)
Using the decorated nanofibers as an active layer sandwiched between two aluminum electrodes, we have recently discovered that Au/polyaniline nanofibers possess a remarkable property--electrically switchable bistability, which is ideal for nonvolatile, flash memory devices. The device can be switched from the off- to the on- state at ≥3V with a switching time of ~15 nanoseconds. This produces an abrupt increase in current of more than three orders of magnitude. The device can be switched back to the off-state at ≤-5 V. The device is stable in both states and switching between these two states can be repeated numerous times without any obvious decay. In this project, we will explore the important features of this material and then seek to develop a prototype high-density, high-performance nonvolatile/flash memory circuit.

A general chemical route to polyaniline nanofibers


Synthesis of polyaniline nanofibers by "nanofiber seeding".

Keywords: Polyaniline nanotubes, Oxidation polymerization, Template free polymerization, Heavy metal removal, Competitive uptake, Mercury, Lead, Cadmium, Copper, Zinc

Polyaniline nanofiber composites with amines: ..

N2 - Nanofibers with diameters of tens of nanometers appear to be an intrinsic morphological unit that was found to "naturally" form in the early stage of the chemical oxidative polymerization of aniline. In conventional polymerization, nanofibers are subject to secondary growth of irregularly shaped particles, which leads to the final granular agglomerates. The key to producing pure nanofibers is to suppress secondary growth. Based on this, two methods-interfacial polymerization and rapidly mixed reactions-have been developed that can readily produce pure nanofibers by slightly modifying the conventional chemical synthesis of polyaniline without the need for any template or structural directing material. With this nanofiber morphology, the dispersibility and processibility of polyaniline are now much improved. The nanofibers show dramatically enhanced performance over conventional polyaniline applications such as in chemical sensors. They can also serve as a template to grow inorganic/polyaniline nanocomposites that lead to exciting properties such as electrical bistability that can be used for nonvolatile memory devices. Additionally, a novel flash welding technique for the nanofibers has been developed that can be used to make asymmetric polymer membranes, form patterned nanofiber films, and create polymer-based nanocomposites based on an enhanced photothermal effect observed in these highly conjugated polymeric nanofibers.

Polyaniline nanofibers have been synthesized using a ..

Stable dispersions of nanofibers are virtually unknown for synthetic polymers. They can complement analogous dispersions of inorganic components, such as nanoparticles, nanowires, nanosheets, as a fundamental component of a toolset for design of nanostructures and metamaterials numerous solvent-based processing methods. As such, strong flexible polymeric nanofibers are very desirable for the effective utilization within composites of nanoscale inorganic components such as nanowires, carbon nanotubes, graphene, and others. Here stable dispersions of uniform high-aspect-ratio aramid nanofibers (ANFs) with diameters between 3 and 30 nm and up to 10 μm in length were successfully obtained. Unlike the traditional approaches based on polymerization of monomers, they are made by controlled dissolution of standard macroscale form of the aramid polymer, that is, well-known Kevlar threads, and revealed distinct morphological features similar to carbon nanotubes. ANFs are successfully processed into films using layer-by-layer (LBL) assembly as one of the potential methods of preparation of composites from ANFs. The resultant films are transparent and highly temperature resilient. They also display enhanced mechanical characteristics making ANF films highly desirable as protective coatings, ultrastrong membranes, as well as building blocks of other high performance materials in place of or in combination with carbon nanotubes.