Characterization of suspended single-walled carbon nanotube film formed by ac dielectrophoresis for infrared sensing applications

June Kyoo Lee, Ho Jung, Ju Chan Choi, Taechang An, Geunbae Lim, Seong Ho Kong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A suspended single-walled carbon nanotube (SWNT) film was formed by alternating current dielectrophoresis on a silicon cavity and its electrical and optical characteristics were investigated for infrared (IR) sensing application. This study shows that a suspended SWNT film with an active detector area of 15 μm×3 μm functioned well as a bolometer. The fabricated SWNT-based bolometer was characterized by measuring the current-voltage curve, response time, resistance change with variation in temperature, optical responsivity, time-dependent reliability in responsivity, and detectivity in order to verify the performance of the IR detection. The experimental results showed that the fabricated bolometer had the appropriate IR-sensitive properties with a response time of ∼10 ms and a temperature coefficient of resistance (TCR) of -1.19%/K. Particularly, the bolometer had a reasonable responsivity of 2.96×105 mV/W compared to conventional bolometers based on SWNTs and good time-dependent reliability during the experimental period.

Original languageEnglish
Pages (from-to)452-458
Number of pages7
JournalSensor Letters
Volume11
Issue number3
DOIs
StatePublished - Aug 2013

Keywords

  • Bolometer
  • Dielectrophoresis
  • Responsivity
  • Single-Walled Carbon Nanotube Film
  • Temperature Coefficient of Resistance

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