Emre Uygun

RF plasma modified W5O14 and MoS2 hybrid nanostructures and photovoltaic properties

ABSTRACT Modification of W5O14 and MoS2 nanostructures was carried out using 3,4-ethylenedioxythiophene monomer in a capacitively coupled, RF rotating plasma reactor. Raman spectroscopy and X-ray diffraction (XRD) measurements were used for structural characterization. The surface morphologies of nanomaterials were investigated using transmission electron microscopy. Polymer coated (W5O14/PEDOT, MoS2/PEDOT) and untreated (W5O14, MoS2) nanostructures were used as the counter electrode for dye-sensitized solar cells. Photovoltaic performances of W5O14/PEDOT and MoS2/PEDOT hybrid nanostructures were higher than those of W5O14 and MoS2 inorganic nanostructures. Our results indicate that plasma polymer coated W5O14 and MoS2 nanostructures of the device for cathode increase both its fill factor and its energy conversion efficiency.

Plasma help preparation of electrospun carbon nanofibers

This work reports the fabrication and characterization of polyacrylonitril (PAN) nanofibers by electrospinning and further development of the as-spun PAN nanofibers into carbon nanofibers by using plasma help carbonization process. PAN nanofibers as a precursor of carbon nanofibers were prepared by electrospinning of PAN/DMF solution. The aligned electrospun polyacrylonitrile (PAN) nanofibers were converted to carbon fibers under plasma conditions and high temperatures. Morphologies, structures and thermal properties of PAN, stabilized and carbonized nanofibers were investigated by scanning electron microscopy (SEM-EDS), infrared spectrometer (IR), thermal gravimetric analysis (TGA).