Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Layer-by-Layer Deposited Multi-Modal PDAC/rGO Composite-based Sensors

Ammar Al-Hamry
ORCID logo ,
Tianqi Lu
ORCID logo ,
Jing Bai
,
Anurag Adiraju
,
Tharun K. Ega
,
Igor A. Pašti
ORCID logo ,
Olfa Kanoun
* ORCID logo
Version 1 : Received: 26 December 2022 / Approved: 28 December 2022 / Online: 28 December 2022 (01:18:48 CET)

A peer-reviewed article of this Preprint also exists.

Al-Hamry, A.; Lu, T.; Bai, J.; Adiraju, A.; Ega, T.K.; Pašti, I.A.; Kanoun, O. Layer-by-Layer Deposited Multi-Modal PDAC/rGO Composite-Based Sensors. Foods 2023, 12, 268. Al-Hamry, A.; Lu, T.; Bai, J.; Adiraju, A.; Ega, T.K.; Pašti, I.A.; Kanoun, O. Layer-by-Layer Deposited Multi-Modal PDAC/rGO Composite-Based Sensors. Foods 2023, 12, 268.

Abstract

Precise monitoring of different environmental parameters and contaminations during food processing and storage is a key factor for maintaining its safety and nutritional value. Thus, developing reliable, efficient, cost-effective sensor devices for these purposes is of utmost importance. In this paper, we show that Poly-(diallyl-dimethylammonium chloride)/reduced Graphene oxide (PDAC/rGO) films produced by a simple Layer-by-Layer deposition can be effectively used to monitor temperature, relative humidity and the presence of volatile organic compounds as indicators for spoilage odors. At the same time, they show potential for electrochemical detection of organophosphate pesticide dimethoate. By monitoring the resistance/impedance changes during temperature and relative humidity variations or upon the exposure of PDAC/rGO films to methanol, good linear responses were obtained in the temperature range of 10-100 °C, 15-95 % relative humidity, and 35 ppm - 55 ppm of methanol. Moreover, linearity in the electrochemical detection of dimethoate is shown for the concentrations in the order of 102 µmol dm−3. The analytical response to different external stimuli and analytes depends on the number of layers deposited, affecting sensors’ sensitivity, response and recovery time, and long-term stability. The presented results could serve as a starting point for developing advanced multimodal sensor devices and sensor arrays with high potential for analytical applications in food safety and quality monitoring.

Keywords

multi-modal sensing devices; PDAC; reduced graphene oxide; layer-by-layer deposition; temperature monitoring; relative humidity measurements; volatile organic compounds; electrochemical sensing

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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