New chemical sensors based on point heterocontact between single wall carbon nanotubes and gold wires

Authors

Gennadiy V. Kamarchuk, B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Igor G. Kolobov, B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Andrei V. Khotkevich, B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Igor K. Yanson, B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Alexander P. Pospelov, National Technical University Kharkiv Polytechnic Institute

Document Type

Article

Date of Original Version

9-25-2008

Abstract

The effect on the gas sensitivity of point heterocontact between single walled nanotubes (SWNTs) and a gold microwire is demonstrated for the first time. Au-SWNT heterocontact sensors exhibit high sensitivity to NH3 and NO2 vapors with fast response and relaxation and demonstrate that these two gases can be distinguished based on the direction of charge transfer between the analyte and the SWNTs. The mechanism of sensing is associated with formation of a thin conductive channel between Au and SWNT, but the sign of the resistance change is controlled by the SWNT. © 2008 Elsevier B.V. All rights reserved.

Publication Title, e.g., Journal

Sensors and Actuators, B: Chemical

Volume

134

Issue

2

Citation/Publisher Attribution

Kamarchuk, Gennadiy V., Igor G. Kolobov, Andrei V. Khotkevich, Igor K. Yanson, and Alexander P. Pospelov. "New chemical sensors based on point heterocontact between single wall carbon nanotubes and gold wires." Sensors and Actuators, B: Chemical 134, 2 (2008): 1022-1026. doi: 10.1016/j.snb.2008.07.012.