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Chemosensors
Volume 11
Issue 4
10.3390/chemosensors11040224
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Article

Flexible Miniaturized Electrochemical Sensors Based on Multiwalled Carbon Nanotube-Chitosan Nanomaterial for Determination of Nitrite in Soil Solutions

by
Ana-Maria Gurban
1,*,
Lucian-Gabriel Zamfir
1,
Petru Epure
2,
Ioana-Raluca Șuică-Bunghez
1,
Raluca Mădălina Senin
1,
Maria-Luiza Jecu
1,
Maria Lorena Jinga
1 and
Mihaela Doni
1,*
1
National Research & Development Institute for Chemistry & Petrochemistry—ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania
2
EPI-SISTEM SRL, 17A Livezii, Săcele, 505600 Brașov, Romania
*
Authors to whom correspondence should be addressed.
Chemosensors 2023, 11(4), 224; https://doi.org/10.3390/chemosensors11040224
Submission received: 26 February 2023 / Revised: 27 March 2023 / Accepted: 3 April 2023 / Published: 5 April 2023
(This article belongs to the Special Issue Carbon Nanomaterials and Related Materials for Sensing Applications)
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Abstract

Flexible screen-printed electrodes (SPE) were modified in a simple manner with different composite nanomaterials based on carbon allotropes, polymers, and metallic nanoparticles, for amperometric detection of nitrites in soil. Multiwalled carbon nanotubes (MWCNT), chitosan (CS), silver nanoparticles (AgNPs), 1,8-diaminonaphthalene (1,8-DAN), and a sol-gel (SG) matrix were used for modification of the carbon paste working electrodes. Sensitive and selective detection of nitrite was achieved by using a MWCNT-CS-modified sensor, in acetate buffer at pH 5, at an applied potential of 0.58 V vs. Ag/AgCl. The MWCNT-CS-based sensor displayed a specific sensitivity of 204.4 mA·M−1·cm−2, with a detection limit of 2.3 µM (S/N = 3) in a linear range up to 1.7 mM, showing good stability, reproducibility, and selectivity towards other interfering species. A miniaturized portable system using the developed flexible electrochemical MWCNT-CS-based sensors was dedicated for the detection of nitrite in different samples of soil solutions extracted by using suction lysimeters.
Keywords: flexible sensors; MWCNT-chitosan nanocomposite; nitrite; soil solution; lysimeter flexible sensors; MWCNT-chitosan nanocomposite; nitrite; soil solution; lysimeter
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MDPI and ACS Style

Gurban, A.-M.; Zamfir, L.-G.; Epure, P.; Șuică-Bunghez, I.-R.; Senin, R.M.; Jecu, M.-L.; Jinga, M.L.; Doni, M. Flexible Miniaturized Electrochemical Sensors Based on Multiwalled Carbon Nanotube-Chitosan Nanomaterial for Determination of Nitrite in Soil Solutions. Chemosensors 2023, 11, 224. https://doi.org/10.3390/chemosensors11040224

AMA Style

Gurban A-M, Zamfir L-G, Epure P, Șuică-Bunghez I-R, Senin RM, Jecu M-L, Jinga ML, Doni M. Flexible Miniaturized Electrochemical Sensors Based on Multiwalled Carbon Nanotube-Chitosan Nanomaterial for Determination of Nitrite in Soil Solutions. Chemosensors. 2023; 11(4):224. https://doi.org/10.3390/chemosensors11040224

Chicago/Turabian Style

Gurban, Ana-Maria, Lucian-Gabriel Zamfir, Petru Epure, Ioana-Raluca Șuică-Bunghez, Raluca Mădălina Senin, Maria-Luiza Jecu, Maria Lorena Jinga, and Mihaela Doni. 2023. "Flexible Miniaturized Electrochemical Sensors Based on Multiwalled Carbon Nanotube-Chitosan Nanomaterial for Determination of Nitrite in Soil Solutions" Chemosensors 11, no. 4: 224. https://doi.org/10.3390/chemosensors11040224

APA Style

Gurban, A.-M., Zamfir, L.-G., Epure, P., Șuică-Bunghez, I.-R., Senin, R. M., Jecu, M.-L., Jinga, M. L., & Doni, M. (2023). Flexible Miniaturized Electrochemical Sensors Based on Multiwalled Carbon Nanotube-Chitosan Nanomaterial for Determination of Nitrite in Soil Solutions. Chemosensors, 11(4), 224. https://doi.org/10.3390/chemosensors11040224

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