Real-Time Intelligent Chemical and Biological Nanosensors on Flexible Platform

Report No. ARL-TN-325
Authors: Govind Mallick; Shashi P. Karna; Pulickel M. Ajayan
Date/Pages: July 2008; 20 pages
Abstract: As a first step toward realizing real-time nanoscale electronic sensors for chemical and biological agents, we have successfully fabricated arrays of switching elements in open-channel configurations using single-walled carbon nanotubes (SWNTs) as the carrier transport medium. Using a chemical-vapor deposition process, we have grown long strands of SWNT bundles and used them to fabricate multiple arrays of switching devices with the channel length of 3, 5, 7, and 10 μm on a 15- × 15-mm SiO2-on-Si substrate. Regardless of the channel length, a large majority of the fabricated devices show current rectification characteristics, with a very high throughput of current in the forward bias. The exact physical mechanism of the observed current rectification could not be established. However, the atomic force microscopic analysis of the device structure and morphology of the SWNT suggest the observed rectification to result either from cross-tube junctions or a mixture of metallic and semiconducting tubes in the SWNT bundles.
Distribution: Approved for public release
  Download Report ( 0.836 MBytes )
If you are visually impaired or need a physical copy of this report, please visit and contact DTIC.

Last Update / Reviewed: July 1, 2008