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Electrical and gas sensing properties of polyaniline functionalized single-walled carbon nanotubes
Lim, Jae-Hong,Phiboolsirichit, Nopparat,Mubeen, Syed,Deshusses, Marc A,Mulchandani, Ashok,Myung, Nosang V IOP Pub 2010 Nanotechnology Vol.21 No.7
<P>Electrical and gas sensing properties of single-walled carbon nanotube networks functionalized with polyaniline (PANI–SWNTs) were systematically investigated to understand the gas sensing mechanisms and optimize sensing performance. The temperature-dependent electrical resistance and field-effect transistor (FET) transfer characteristics indicated that the electrical properties of PANI–SWNTs are dominated by the PANI coating. The FET transfer characteristics of PANI–SWNTs exposed to different NH<SUB>3</SUB> concentrations indicated that the dominant sensing mechanism is the deprotonation of PANI by NH<SUB>3</SUB>. Sensing experiments with different gas analytes revealed that PANI–SWNTs responded positively to NH<SUB>3</SUB>, and negatively to NO<SUB>2</SUB> and H<SUB>2</SUB>S with sensitivities of 5.8% per ppm<SUB>v</SUB> of NH<SUB>3</SUB>, 1.9% per ppm<SUB>v</SUB> of NO<SUB>2</SUB>, and 3.6% per ppm<SUB>v</SUB> of H<SUB>2</SUB>S. The lower detection limits were 50, 500, and 500 ppb for NH<SUB>3</SUB>, NO<SUB>2</SUB>, and H<SUB>2</SUB>S, respectively.</P>
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