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Smart Structures and Systems
  Volume 12, Number 1, July 2013, pages 73-95
DOI: http://dx.doi.org/10.12989/sss.2013.12.1.073
 


DNA-functionalized single-walled carbon nanotube-based sensor array for gas monitoring
Wenjun Zhang, Yu Liu and Ming. L Wang

 
Abstract
    Nine deoxyribonucleic acid (DNA) sequences were used to functionalize single-walled carbon nanotube (SWNT) sensors to detect the trace amount of methanol, acetone, and HCl in vapor. DNA 24 Ma (24 randomly arranged nitrogenous bases with one amine at each end of it) decorated SWNT sensor and DNA 24 A (only adenine (A) base with a length of 24) decorated SWNT sensor have demonstrated the largest sensing responses towards acetone and HCl, respectively. On the other hand, for the DNA GT decorated SWNT sensors with different sequence lengths, the optimum DNA sequence length for acetone and HCl sensing is 32 and 8, separately. The detection of methanol, acetone, and HCl have identified that DNA functionalized SWNT sensors exhibit great selectivity, sensitivity, and repeatability with an accuracy of more than 90%. Further, a sensor array composed of SWNT functionalized with various DNA sequences was utilized to identify acetone and HCl through pattern recognition. The sensor array is a combination of four different DNA functionalized SWNT sensors and two bare SWNT sensors (work as reference). This wireless sensing system has enabled real-time gas monitoring and air quality assurance for safety and security.
 
Key Words
    DNA-SWNT sensor; wireless sensor array; gas monitoring; pattern recognition
 
Address
Wenjun Zhang and L Wang : Department of Civil & Environmental Engineering, Northeastern University, 360 Huntington Ave,Boston, MA, U.S.A. 02115
Yu Liu : Department of Electrical &Computer Engineering, Northeastern University, 360 Huntington Ave,
Boston, MA, U.S.A. 02115
 

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