Cavitand-Functionalized SWCNTs for N-Methylammonium Detection
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Single-walled carbon nanotubes (SWCNTs) have been functionalized with highly selective tetraphosphonate cavitand receptors. The binding of charged N-methylammonium species to the functionalized SWCNTs was analyzed by X-ray photoelectron spectroscopy and confirmed by [superscript 31]P MAS NMR spectroscopy. The cavitand-functionalized SWCNTs were shown to function as chemiresistive sensory materials for the detection of sarcosine and its ethyl ester hydrochloride in water with high selectivity at concentrations as low as 0.02 mM. Exposure to sarcosine and its derivative resulted in an increased conductance, in contrast to a decreased conductance response observed for potential interferents such as the structurally related glycine ethyl ester hydrochloride.
Date issued
2012-04Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of ChemistryJournal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Dionisio, Marco et al. “Cavitand-Functionalized SWCNTs for N-Methylammonium Detection.” Journal of the American Chemical Society 134.15 (2012): 6540–6543.
Version: Author's final manuscript
ISSN
0002-7863
1520-5126