The first application of self-assembled carbon nanotubes (CNT) inside a steel capillary to fabricate a microtrap for the nanoscale adsorption/desorption of organic molecules is presented. The CNT-coated microtrap functions as a nanoconcentrator that can be used for sensing and analytical-scale separation, e.g., GC. The CNT deposit as a thin-film on the walls of the capillary from either CO or C2H4 carbon precursors. Trace level small organic molecules, e.g., hexane and toluene, are adsorbed and then rapidly desorbed from the CNT film inside the capillary. The desorption pulse provides a concentrated injection for the detector, and also for GC separation. Sorption of toluene is much stronger than that of hexane, which is attributed to the p-p interaction between the CNT sidewall and the aromatic ring of toluene. This is an abstract of a paper presented at the 230th ACS National Meeting (Washington, DC 8/28/2005-9/1/2005).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)