Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 14, Issue 3, Pages 2532-2538Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2014.8524
Keywords
Black Carbon; Anthropogenic; Spider Web; Carbon Nanotubes; Ferromagnetism
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Funding
- CSIR, N. Delhi
- DST, N. Delhi [SR/S5/NM-17/2004]
- DST [SR/S1/IC-06/2010]
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Black carbon (BC) (as partly burnt black particulate matter) present indoor are deposited on interior surfaces of the indoors (easily visualize over the blades of electric fan/exhausts and over domestic spider webs) are known to be a potential indoor pollution problem. We detect with the help of indoor spider webs the floating BC contains a significant amount of defective multiwalled carbon nanotubes (MWCNTs) possessing room temperature ferromagnetism. Microscopic studies shows a lot of internal and surfacial defects in these indoor-MWCNTs. Electron paramagnetic resonance (EPR) showed the presence of very stable carbon centred radicals in these indoor-MWCNTs. Room temperature ferromagnetism most importantly originated by the presence of a large amount of unpaired spin frustrated carbon centred radicals (trapped in defects, junctions and fractures) which are inadvertently formed during the pyrolysis of carbonaceous materials through routine domestic activities.
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