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Chemical detection with a single-walled carbon nanotube capacitor | | E S Snow
; F K Perkins
; E J Houser
; S C Badescu
; T L Reinecke
; | | Date: |
25 Mar 2005 | | Journal: | Science, 307 (5717), 1942-5 | | Abstract: | We show that the capacitance of single-walled carbon nanotubes (SWNTs) is highly sensitive to a broad class of chemical vapors and that this transduction mechanism can form the basis for a fast, low-power sorption-based chemical sensor. In the presence of a dilute chemical vapor, molecular adsorbates are polarized by the fringing electric fields radiating from the surface of a SWNT electrode, which causes an increase in its capacitance. We use this effect to construct a high-performance chemical sensor by thinly coating the SWNTs with chemoselective materials that provide a large, class-specific gain to the capacitance response. Such SWNT chemicapacitors are fast, highly sensitive, and completely reversible. | | Source: | PubMed, pmid15790850 doi: 10.1126/science.1109128 | | Services: | Forum | Review | Favorites | |
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