Photoluminescence and electron paramagnetic resonance studies of springlike carbon nanofibers

Bipin Kumar Gupta, V. Shanker, Manju Arora, D. Haranath
2009 Applied Physics Letters  
Carbon nanofiber ͑CNF͒ with springlike and double-helix structures has been synthesized by catalytic thermal pyrolysis of an acetylene precursor at 850-950°C using iron nanopowder and thiophene as catalyst and promoter, respectively. High resolution electron microscopy revealed a higher d-spacing ͑ϳ3.46 Å͒ of ͑002͒ crystal plane than customary multiwalled carbon nanotube ͑MWCNT͒ ͑3.37 Å͒ that helps in sustaining mechanical shocks better than MWCNTs. The large surface to volume ratio of
more » ... e ratio of springlike CNF does provide many delocalized free electrons to enhance the photoluminescence activity. Electron paramagnetic resonance signal showed a single narrow line having g-value 2.0024Ϯ 0.0002 and spin contribution 3.4956ϫ 10 −16 spins/ g.
doi:10.1063/1.3206663 fatcat:an2rujehhvfnrkjplirk676rqa