A water dispersible graphene polymer nanocomposite was synthesized by solution blending method and deposited on a nylon-6 membrane via vacuum assisted self - Assembly (VASA) method to fabricate a flexible material applied as a chemoresistive gas sensor for trimethylamine (TMA). The morphological and structural characterization of graphene/polystyrene-sulfonate nanocomposite were carried out by using Fourier-Transform infrared (FT-IR) spectroscopy, Raman spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy and field-effect scanning electron (FE-SEM) microscope. While, electrical conductivity was measured using a four-point probe measurement. The prepared polymer nanocomposite has a percolation threshold around 0.30% vol. fraction, with a conductivity of 2.45 S/m (rsd = 3.0%, n=3). The response of the composite sensor exhibited linear range from 23 to 183 mg/L (r<sup>2</sup>=0.95713) and the sensitivity was at 1.72 × 10<sup>-3</sup> ΔR/R mg L<sup>-1</sup>. The gas sensor exhibited repeatable response to TMA gas and the calculated limit of detection was at 22.67 mg/L.
Ranola, R. A. G., Concina, I., Sevilla, F. B., Ferroni, M., Sangaletti, L. E., Sberveglieri, G., Comini, E., Room temperature trimethylamine gas sensor based on aqueous dispersed graphene, in Proceedings of the 2015 18th AISEM Annual Conference, AISEM 2015, (Fondazione Bruno Kessler, Trento, Italy, 03-05 February 2015), Institute of Electrical and Electronics Engineers Inc., New York 2015: 1-4. [10.1109/AISEM.2015.7066827] [http://hdl.handle.net/10807/98150]
Room temperature trimethylamine gas sensor based on aqueous dispersed graphene
Sangaletti, Luigi Ermenegildo;Comini, ElisabettaUltimo
2015
Abstract
A water dispersible graphene polymer nanocomposite was synthesized by solution blending method and deposited on a nylon-6 membrane via vacuum assisted self - Assembly (VASA) method to fabricate a flexible material applied as a chemoresistive gas sensor for trimethylamine (TMA). The morphological and structural characterization of graphene/polystyrene-sulfonate nanocomposite were carried out by using Fourier-Transform infrared (FT-IR) spectroscopy, Raman spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy and field-effect scanning electron (FE-SEM) microscope. While, electrical conductivity was measured using a four-point probe measurement. The prepared polymer nanocomposite has a percolation threshold around 0.30% vol. fraction, with a conductivity of 2.45 S/m (rsd = 3.0%, n=3). The response of the composite sensor exhibited linear range from 23 to 183 mg/L (r2=0.95713) and the sensitivity was at 1.72 × 10-3 ΔR/R mg L-1. The gas sensor exhibited repeatable response to TMA gas and the calculated limit of detection was at 22.67 mg/L.
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