Gupta, Bipin Kumar and Shanker, V. and Arora, Manju and Haranath, D.
(2009)
Photoluminescence and electron paramagnetic resonance studies of springlike carbon nanofibers.
Applied Physics Letters, 95 (7).
073115-1-073115-3.
ISSN 1077-3118
Abstract
Carbon nanofiber (CNF) 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 ( ∼ 3.46 Å) of (002) crystal plane than customary multiwalled carbon nanotube (MWCNT) (3.37 Å) that helps in sustaining mechanical shocks better than MWCNTs. The large surface to volume 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 2.0024±0.0002 and spin contribution 3.4956×10−16 spins/g.
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