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Research Papers

# Carbon Nanotube-Based Sensors for Detection of Gas Atoms

[+] Author and Article Information
Behrouz Arash

Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MN, R3T 5V6, Canada

Quan Wang1

Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MN, R3T 5V6, Canadaq_wang@umanitoba.ca

Department of Electrical Engineering, University of Arkansas, Fayetteville, AR 72701-1201

1

Corresponding author.

J. Nanotechnol. Eng. Med 2(2), 021010 (May 16, 2011) (4 pages) doi:10.1115/1.4003967 History: Received March 14, 2011; Revised March 14, 2011; Published May 16, 2011; Online May 16, 2011

## Abstract

The potential of single-walled carbon nanotubes as nanosensors in detection of noble gases via a vibration analysis is investigated using molecular dynamics simulations. An index based on frequency shifts of the nanotubes in an environment of noble gas atoms is defined and examined to measure the sensitivity of the sensors. The effects of density of gas atoms on the tube sensors, the diameter and length of the tubes, and the type of restrained boundary of the tubes on the sensitivity are studied. The simulation results indicate that the resolution of a sensor made of a (8, 8) carbon nanotube with a length of 4.92 nm can achieve an order of $10−6 fg$ and the sensitivity can be enhanced by nanotubes with smaller sizes and stiffer boundary conditions.

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## Figures

Figure 2

The vibration responses of a pristine (8, 8) SWCNT with a length of 4.92 nm, restrained with a clamped-clamped boundary condition, and the SWCNT surrounded by Kr atoms with a density of 10 Natoms/nm2

Figure 3

Sensitivity of an (8, 8) SWCNT-based sensor with a length of 4.92 nm and clamped-clamped and clamped-free boundary condition surrounded by Kr atoms versus the density of the noble gas atoms

Figure 4

Sensitivity of (8, 8) and (10, 10) SWCNTs with the clamped-clamped boundary condition surrounded by Kr atoms with a density of 10 Natoms/nm2 versus the length of the tubes

Figure 1

Top and side views of an (8, 8) SWCNT with a length of 4.92 nm and clamped-clamped boundary condition surrounded by Kr noble gas atoms with a density of 10 Natoms/nm2: (a) before vibrations and (b) during vibrations

Figure 5

Sensitivity of an (8, 8) SWCNT with a length of 4.92 nm and the clamped-clamped boundary condition surrounded by three types of noble gas atoms versus the mass of the noble gas atoms

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