Role of defects in single-walled carbon nanotube chemical sensors.
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.
Robinson
Joshua A
JA
The Naval Research Laboratory, Electronic Science and Technology Division, 4555 Overlook Avenue, Washington, DC 20375, USA.
Snow
Eric S
ES
Badescu
Stefan C
SC
Reinecke
Thomas L
TL
Perkins
F Keith
FK
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
D005740:Gases; D037742:Nanotubes, Carbon; D009930:Organic Chemicals