Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 23, Pages 5936-5940Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201311053
Keywords
ambient ionization; carbon nanotubes; field emission; paper spray ionization; Raman spectroscopy
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Funding
- University Grants Commission
- National Science Foundation [CHE 1307264]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1307264] Funding Source: National Science Foundation
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Ambient ionization is achieved by spraying from a carbon nanotube (CNT)-impregnated paper surface under the influence of small voltages (>= 3 V). Organic molecules give simple high-quality mass spectra without fragmentation in the positive or negative ion modes. Conventional field ionization is ruled out, and it appears that field emission of microdroplets occurs. Microscopic examination of the CNT paper confirms that the nanoscale features at the paper surface are responsible for the high electric fields. Raman spectra imply substantial current flows in the nanotubes. The performance of this analytical method was demonstrated for a range of volatile and nonvolatile compounds and a variety of matrices.
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