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. 2011;11(7):6509-16.
doi: 10.3390/s110706509. Epub 2011 Jun 24.

A single polyaniline nanofiber field effect transistor and its gas sensing mechanisms

Dajing Chen  1 , Sheng Lei, Yuquan Chen
Affiliations

A single polyaniline nanofiber field effect transistor and its gas sensing mechanisms

Dajing Chen et al. Sensors (Basel). 2011.

Abstract

A single polyaniline nanofiber field effect transistor (FET) gas sensor fabricated by means of electrospinning was investigated to understand its sensing mechanisms and optimize its performance. We studied the morphology, field effect characteristics and gas sensitivity of conductive nanofibers. The fibers showed Schottky and Ohmic contacts based on different electrode materials. Higher applied gate voltage contributes to an increase in gas sensitivity. The nanofiber transistor showed a 7% reversible resistance change to 1 ppm NH(3) with 10 V gate voltage. The FET characteristics of the sensor when exposed to different gas concentrations indicate that adsorption of NH(3) molecules reduces the carrier mobility in the polyaniline nanofiber. As such, nanofiber-based sensors could be promising for environmental and industrial applications.

Keywords: NH3 sensor; field effect; polyaniline; single nanofiber.

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Figures

Figure 1.
Figure 1.
(a) Near field electrospinning and device schematic. (b) Structure of device A. (c) Structure of device B. (d) SEM of single Pani fiber across two electrodes. (Inset) Higher magnification view of the single Pani fiber.
Figure 2.
Figure 2.
I-V characteristics of device A (left) and device B (right).
Figure 3.
Figure 3.
(a) Output characteristics of single Pani fiber. IDS versus VDS for four different gate voltage (VG). (b) Transfer characteristics of single Pani fiber. IDS and IDS1/2 versus VG for VDS kept at 10 V.
Figure 4.
Figure 4.
(a) Real-time response to different concentrations of NH3 at VG = 0 V and VG = −10 V. (b) FET output characteristics in different NH3 concentrations at VG = −5 V.
Figure 5.
Figure 5.
(a) Repeatability test with 10 ppm NH3 (VG = −10 V). (b) Sensitivity compare of Pani fiber sensor with or without gate voltage and CNT sensor.
See this image and copyright information in PMC

References

    1. Bai H, Shi G. Gas sensors based on conducting polymers. Sensors. 2007;7:267–307.
    1. Lu X, Wang C, Wei Y. One dimensional composite nanomaterials: Synthesis by electrospinning and their applications. Small. 2009;5:2349–2370. - PubMed
    1. Tseng RJ, Huang J, Ouyang J, Kaner RB, Yang Y. Polyaniline nanofiber/gold nanoparticle nonvolatile memory. Nano Lett. 2005;5:1077–1080. - PubMed
    1. Joo J, Epstein A. Electromagnetic radiation shielding by intrinsically conducting polymers. Appl. Phys. Lett. 1994;65:2278–2280.
    1. Virji S, Fowler JD, Baker CO, Huang J, Kaner RB, Weiller BH. Polyaniline nanofiber composites with metal salts: Chemical sensors for hydrogen sulfide. Small. 2005;1:624–627. - PubMed