title: Role of defects in single-walled carbon nanotube chemical sensors.
abstract: We explore the electronic response of single-walled carbon nanotubes (SWNT) to trace levels of chemical vapors. We find adsorption at defect sites produces a large electronic response that dominates the SWNT capacitance and conductance sensitivity. This large response results from increased adsorbate binding energy and charge transfer at defect sites. Finally, we demonstrate controlled introduction of oxidation defects can be used to enhance sensitivity of a SWNT network sensor to a variety of chemical vapors.
authors.affiliation: The Naval Research Laboratory, Electronic Science and Technology Division, 4555 Overlook Avenue, Washington, DC 20375, USA.
authors.forename: Joshua A
authors.initials: JA
authors.lastname: Robinson
authors.forename: Eric S
authors.initials: ES
authors.lastname: Snow
authors.forename: Stefan C
authors.initials: SC
authors.lastname: Badescu
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Reinecke
authors.forename: F Keith
authors.initials: FK
authors.lastname: Perkins
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis*; D008839:Microelectrodes; D008956:Models, Chemical; D008958:Models, Molecular; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D009930:Organic Chemicals / Q000032:analysis*; D014159:Transducers
chemical_list: D005740:Gases; D037742:Nanotubes, Carbon; D009930:Organic Chemicals