Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 345, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130390
Keywords
Photoelectrochemical sensor; Lactate; Polymer [Ni(salen)]; In Situ FTIR; TiO2
Funding
- Brazilian Sao Paulo Research Foundation (FAPESP) [2017/11986-5, 2018/20952-0, 2018/22214-6, 2019/13514-9, 2019/017775, 2019/00101-8]
- CAPES [001, 88887.334689/2019-00]
- CNPq
- ANP (Brazil's National Oil, Natural Gas and Biofuels Agency)
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This paper introduces a portable photoelectrochemical system developed with screen-printed carbon electrodes and LED for detecting lactate. The sensitivity of the sensor was enhanced by electrode coating with a polymer, resulting in excellent stability and selectivity. In situ FTIR measurements confirmed that carbon dioxide is the main product from photoelectrooxidation of lactate on TiO2@poly[Ni(salen)].
In this paper we present a portable photoelectrochemical system developed with screen-printed carbon electrodes (SPCEs) and a 3 W light-emitting diode (LED). The device with 3D printed structure was applied for detecting lactate on TiO2 nanoparticles modified with [Ni(salen)] polymer film (referred to as TiO2@poly[Ni (salen)]). Electrode coating with the polymer increased the sensitivity of the photoelectrochemical sensor, resulting in a linear range from 0.1 to 20 mmol L-1 with a limit of detection (LOD) of 88 mu mol L-1. The sensing system exhibited excellent stability, reproducibility, and selectivity. We also demonstrated by in situ Fouriertransform infrared spectroscopy (FTIR) measurements that carbon dioxide (CO2) is the main product from photoelectrooxidation of lactate on TiO2@poly[Ni(salen)]. The portable system can be employed with any type of modified electrodes to function as photoelectroanalytical (bio)sensors, especially for point-of-care diagnostics.
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