Oligomer-Assisted Synthesis of Chiral Polyaniline Nanofibers

Li, Wenguang; Wang, Hsing‐Lin

doi:10.1021/ja039672q

Cited by 288 publications

(188 citation statements)

References 16 publications

Supporting

Mentioning

176

Contrasting

Order By: Relevance

“…Helical nanofibers made from conjugated polymers have unique electronic and optical properties. They are expected to be used as building blocks in novel organic nanophotonic and electronic devices, as well as field-effect transistors, energy storage units and sensors [124][125][126][127][128]. Nanoscale helices have been made from the contraction of a manganese oxide sol gel upon solvent evaporation, as well as from zinc oxide and silicon dioxide using vapor processing methods [129][130][131].…”

Section: Helicalmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

130

View full text Add to dashboard Cite

Abstract:Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures-including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications-will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

show abstract

Section: Helicalmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

130

View full text Add to dashboard Cite

show abstract

“…[21,22] Interfacial polymerization is shown to be readily scalable to produce bulk quantities of nanofibers. Recently fibers of PANi-CSA blended with polyethylene oxide (PANi-CSA/PEO) were fabricated by an electrostatic spinning (electrospinning)…”

Section: Advances In the Synthesis Of Polymer Nanofibers And Nanotubesmentioning

confidence: 99%

Polymer Nanofibers and Nanotubes: Charge Transport and Device Applications

2005

View full text Add to dashboard Cite

A critical analysis of recent advances in synthesis and electrical characterization of nanofibers and nanotubes made of different conjugated polymers is presented. The applicability of various theoretical models is considered in order to explain results on transport in conducting polymer nanofibers and nanotubes. The relationship between these results and the one-dimensional (1D) nature of the conjugated polymers is discussed in light of theories for tunneling in 1D conductors (e.g. Luttinger liquid, Wigner crystal). The prospects for nanoelectronic applications of polymer fibers and tubes as wires, nanoscale field-effect transistors (nanoFETs), and in other applications are analyzed.

show abstract

“…These approaches include use of templates [9,10] or surfactants, [11±13] electrospinning, [14±16] coagulating media, [17,18] interfacial polymerization, [19±21] seeding, [22] and oligomer-assisted polymerization. [23] Of these methods, interfacial polymerization is one of the easier and less-expensive means of obtaining nanofibers in one step. However, this method requires organic solvents to dissolve the aniline monomer, resulting in a waste stream that must be treated.…”

mentioning

confidence: 99%

Polyaniline Nanofibers Prepared by Dilute Polymerization

2005

View full text Add to dashboard Cite

In summary, unique conical carbon filaments supported on vapor-grown carbon microfibers were synthesized by the ironcatalyzed pyrolysis of methane in the presence of hydrogen. The conical filaments exhibit axial cylindrical channels with open tips. A base-growth mechanism with delayed nucleation of the graphene sheets at protrusions is proposed for the formation of this unique structure. ExperimentalThe reactor used for the fiber growth was a horizontal hot-wall quartz tube with a length and an inner diameter of 100 cm and 3 cm, respectively. The gas feeds (purities: CH 4 , 99.995 %; H 2 , 99.99999 %; He, 99.9999 %) was regulated by mass-flow controllers. The reactor was heated in a mixture of CH 4 and H 2 up to 1150 C and kept for 90 min at this temperature for fiber growth before it was cooled down to 950 C. H 2 was subsequently introduced for 10 min. The reactor was then cooled down to room temperature under He. The CH 4 /H 2 ratio was varied from 3:7 for the growth of the parent VGCFs to 2:8 for the growth of the secondary conical filaments. The total flow rate was always kept at 150 mL min ±1 (at standard temperature and pressure).The parent carbon fibers were grown on rolled pieces of graphite foil (Union Carbide, Grafoil), which were impregnated in advance by an aqueous solution of iron nitrate (Fe[NO 3 ] 3´9 H 2 O, Merck) to achieve an iron loading of 0.0045 mol m 2 . The average length and diameter of the parent VGCFs were 25 mm and 5.8 lm, respectively. The fibers were harvested from the foil and soaked for 24 h in a 0.16 M iron nitrate solution, which was prepared by dissolving iron nitrate into 65 % nitric acid. After filtration and drying at 100 C for 3 h, 0.3 g iron-loaded VGCFs were positioned in a quartz boat in the furnace for secondary filament growth.The fiber morphology was studied by scanning electron microscopy (LEO Gemini 1530) and transmission electron microscopy (Philips CM 200 FEG). In order to avoid possible damage of the conical filaments, the as-grown sample was fixed directly in copper grids for the TEM measurement. Elemental analysis of Fe was performed using a Pye Unicam 7000 ICP±OES Spectrometer. Polyaniline Nanofibers Prepared by Dilute Polymerization** By Nan-Rong Chiou and Arthur J. Epstein* Polyaniline is a conductive polymer that can be synthesized through either chemical polymerization [1±5] or electrochemical polymerization. [2,6±8] In chemical preparation, bulk polymerization is the most common method to prepare polyaniline. As reported previously, [1±5] conventional bulk chemical synthesis produces irregular polyaniline. There have been recent reports of a variety of other chemical methods used to obtain polyaniline nanofibers. These approaches include use of templates [9,10] or surfactants, [11±13] electrospinning, [14±16] coagulating media, [17,18] interfacial polymerization, [19±21] seeding, [22] and oligomer-assisted polymerization.[23] Of these methods, interfacial polymerization is one of the easier and less-expensive means of obtaining nanofibers in one st...

show abstract

Oligomer-Assisted Synthesis of Chiral Polyaniline Nanofibers

Cited by 288 publications

References 16 publications

Hierarchically Structured Electrospun Fibers

Hierarchically Structured Electrospun Fibers

Polymer Nanofibers and Nanotubes: Charge Transport and Device Applications

Polyaniline Nanofibers Prepared by Dilute Polymerization

Contact Info

Product

Resources

About