- Molecular ionization from carbon nanotube paper.
Molecular ionization from carbon nanotube paper.
Angewandte Chemie (International ed. in English) (2014-03-20)
Rahul Narayanan, Depanjan Sarkar, R Graham Cooks, Thalappil Pradeep
PMID24643979
ABSTRACT
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.
MATERIALS
Product Number
Brand
Product Description
Sigma-Aldrich
Diphenylamine, puriss. p.a., redox indicator, ACS reagent, reag. Ph. Eur., ≥98% (GC)
Sigma-Aldrich
Methanol, suitable for HPLC, gradient grade, suitable as ACS-grade LC reagent, ≥99.9%