I&EC 267 |
| Chulho Song and Wei Zhao. Department of Chemistry, University of Arkansas, 2801 South University Ave., Little Rock, AR 72204 |
| Single-walled carbon nanotubes (SWNTs) based sensors have attracted a great deal of attention because their electronic structure is extremely sensitive to the surrounding environments. We have recently demonstrated that surface modification on SWNTs creates an interface that not only makes SWNTs water-soluble but also works as sensing groups responding to pH change. Here we have discovered that the first optical band transition S11 of semiconducting nanotubes of acid-oxidized SWNTs also responds to ethanol in water with very high sensitivity. The SWNTs can sense ethanol with concentrations less than 100 ppm based on the absorbance change of the S11 band. The detection is saturated at ethanol concentrations larger than 500 ppm. The new observation shows great promise for surface modified SWNTs for biosensor applications by further optimizing the surface functionalization. |
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Purification, Separation, and Characterization of Single-Walled Carbon Nanotubes (SWNT's) (sponsored by Advanced Materials & Nanotechnology Subdivision)
8:30 AM-12:20 PM, Thursday, April 1, 2004 Marriott -- Orange County 1, Oral
Division of Industrial and Engineering Chemistry |