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Vol. 33 No. 1 (2021): Vol 33 Issue 1

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Investigation of Organic Field-Effect Transistor (OFET) based NO2 Sensing Response using Low-Cost Green Synthesized Zinc Oxide Nanoparticles

https://doi.org/10.14233/ajchem.2021.22908
G. Balanagireddy
Department of Electronics & Communication Engineering, Rajiv Gandhi University of Knowledge Technologies, IIIT Ongole Campus, Ongole-516330, India
Ashwath Narayana
Department of Bio-Medical Engineering, Rajiv Gandhi Institute of Technology, R.T. Nagar P.O., Hebbal, Bengaluru-560032, India
M. Roopa
Department of Electronics & Communication Engineering, Dayanand Sagar College of Engineering, Bengaluru-560078, India

Corresponding Author(s) : M. Roopa

surajroopa@gmail.com

Asian Journal of Chemistry, Vol. 33 No. 1 (2021): Vol 33 Issue 1

Abstract

A low-cost and green-synthesized zinc oxide nanostructured particles are extensively studied owing to their remarkable and ample characteristics with less toxicity and eco-friendly approach. The present work comprehends the green synthesis of ZnO nanostructured particles using bougainvillea leaf extract-arbitrated microwave-assisted synthesis and their use in field effect transistor for nitrogen dioxide sensing at room temperature. The as-synthesized nanoparticles were characterized using analytical techniques; XRD determined the pure crystallite structure with no impurities, SEM confirmed the spherical shape of nanoparticles with ~20 nm (average particle size) and the atomic weight percentage were analyzed using EDAX, notable photophysical properties were revealed from absorption and emission spectra performed using UV-visible spectroscopy. Poly(3-hexylthiophene) and ZnO nanoparticles were employed in the field effect transistor (p-type) for NO2 sensing at room temperature with the mobility (field-effect) of ~10-4 cm2 V-1 s-1. The sensitivity of the fabricated OFET device was extracted from the transistor characteristics (at Vgs = -30 V and Vds = -40 V) found to be ~4.8 × 10-3 nA/ppm. The device exhibited engrossing characteristics such as excellent recoverability (> 95%), with ultrafast response time (< 30 s) and greater sensitivity with high stability as can be assessed from the electrical characteristics.

Keywords

Bougainvillea Poly(3-hexylthiophene) Zinc oxide nanoparticles Nitrogen dioxide sensor
Balanagireddy, G., Narayana, A., & Roopa, M. (2020). Investigation of Organic Field-Effect Transistor (OFET) based NO2 Sensing Response using Low-Cost Green Synthesized Zinc Oxide Nanoparticles. Asian Journal of Chemistry, 33(1), 31–36. https://doi.org/10.14233/ajchem.2021.22908
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