Fabrication of Organic Transistors Using Nanomaterials for Sensing Applications
Abstract
In this work, an organic field-effect transistor (OFET) was fabricated and characterized based on the bottom contact of a polyaniline (PANI) or PANI/TiO2 nanocomposite as an active layer and SiO2 as an insulating layer to be used for ammonia gas sensing applications. The OFET sensors exhibited a change in the drain current when exposed to NH3. Titanium dioxide (TiO2) nanoparticles with different weight percentages (0–50 wt.%) were added to dope PANI and enhance charge carrier transport, although the response of both the PANI OFET sensor and PANI/TiO2 OFET sensor has reached saturation value at almost the same period. The response of PANI/TiO2 transistor is (2.5), which is much higher than that of PANI (0.17). The results showed that the sensor response of the OFET device fabricated with PANI/TiO2 is 15 times greater than that with an OFET device fabricated using pristine PANI.
- Publication:
-
Journal of Electronic Materials
- Pub Date:
- January 2018
- DOI:
- 10.1007/s11664-017-5776-2
- Bibcode:
- 2018JEMat..47..353H
- Keywords:
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- Conducting polymers;
- TiO<SUB>2</SUB>;
- organic field effect transistor;
- ammonia gas sensor