Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Organophosphorus Compounds Detection Using Suspended SWNT Films

부양형 탄소나노튜브 필름을 이용한 유기인 화합물 검출

  • Kim, Intae (Department of Mechanical Engineering, POSTECH) ;
  • An, Taechang (Department of Mechanical Design Engineering, Andong National University) ;
  • Lim, Geunbae (Department of Mechanical Engineering, POSTECH)
  • 김인태 (포항공과대학교 기계공학과) ;
  • 안태창 (안동대학교 기계설계공학과) ;
  • 임근배 (포항공과대학교 기계공학과)
  • Received : 2013.08.09
  • Accepted : 2013.09.06
  • Published : 2013.09.30
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Abstract

We developed a one-step method for fabrication of addressable suspended SWNT films and demonstrate excellent detection performance of paraoxon based on OPH-immobilized SWNT films for environmental monitoring. For dispersed SWNT suspension, COOH-SWNT was prepared by the oxidation of carbon nanotubes using acid treatment and sonication. Suspended SWNT-film was fabricated between cantilever electrodes by dielectrophoretic force and surface tension of the water meniscus. After that, OPH were immobilized on suspended SWNT-films by nonspecific binding for enzymatic hydrolysis of paraoxon. The electrical properties of the SWNT films were measured in real time at room temperature. Structurally suspended SWNT films from substrate surface made possible rapid and highly sensitive detection of target molecules with increased convectional and diffusional fluxes of the molecules and with a large binding surface area. SWNT film FET resulted in a real-time, label-free, and electrical detection of paraoxon to the concentration of ca. $10{\mu}m$ with a step-wise rapid response time of several seconds.

Keywords

References

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