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Electrospinning Polymer Nanofibers-Electrical and Optical Characterization

Khan, Saima N.

Abstract Details

2007, Doctor of Philosophy (PhD), Ohio University, Physics (Arts and Sciences).

Electro spinning is a technique used for the production of thin continuous fibers from a variety of materials including polymers, composites and ceramics [1-3]. The extremely small diameters (~ nm) and high surface to volume and aspect ratios found in electrospun fibers can not be achieved through conventional spinning.

Electrically conducting polymers are materials which simultaneously possess the physical and chemical properties of organic polymers and the electronic characteristics of metals. In this work fibers were electrospun from polymer blends of polyaniline doped with Camphorsulfonic acid (PAn.HCSA) and polyethylene oxide (PEO) in chloroform. Electrical conductivities of the fibers were measured using the four-point-probe method. The conductivities of the cast films were measured for comparison purposes. It was noticed that the conductivity of both the fibers and films increase exponentially with the concentration of (PAn.HCSA), the conductivity of the film however is higher than that of the mat for any given concentration of PAn.HCSA in PEO. Electrical conductivities of single fibers containing different PAn: HCSA concentrations were measured for the first time and were found to be the highest (3.2S/cm) among the mats and films. The effect of the non-conductive PEO on the conductivity of the polyaniline fibers was studied. Keeping the PAn.HCSA concentration constant films and fibers were obtained from blends containing PEO (300,000 g/mol) and PEO (900,000 g/mol). Higher electrical conductivities were recorded in fibers and mats containing PEO (900,000 g/mol) than those containing PEO (300,000 g/mol).

Silicon Carbide (SiC) fibers were obtained by electrospinning a blend of SiC and PEO in chloroform and sintering the as spun fibers at temperatures of 800°C and 1000°C. The compositional analysis of the annealed samples confirmed the presence of (30-40) µm long SiC fibers with diameters in the range (1-3) µm. Optical spectra of the fibers show red emission extending to the infrared.

For the first time complexes of ruthenium with picolinate and polypyridine ligands were introduced into nanofibers. Fibers containing ruthenium picolinate ([Ru (pic)2¬ (dmso)2]) turn orange from pale yellow on exposure to ultraviolet radiation (350nm). Fibers containing ruthenium bi-pyridine ([Ru(bpy)2](PF6)2) exhibit photoluminescence with steady state red emission upon 450 nm excitation.

Martin Kordesch (Advisor)
107 p.

Recommended Citations

Citations

  • Khan, S. N. (2007). Electrospinning Polymer Nanofibers-Electrical and Optical Characterization [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1200600595

    APA Style (7th edition)

  • Khan, Saima. Electrospinning Polymer Nanofibers-Electrical and Optical Characterization. 2007. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1200600595.

    MLA Style (8th edition)

  • Khan, Saima. "Electrospinning Polymer Nanofibers-Electrical and Optical Characterization." Doctoral dissertation, Ohio University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1200600595

    Chicago Manual of Style (17th edition)