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Current Topics in Analytical Chemistry   Volumes    Volume 15 
Employment of borophene as a potential 2D material in the development of electrochemical sensors
Thiago Gabry Barbosa, Arnaldo César Pereira, Guilherme Ferreira de Lima, Walber Gonçalves Guimarães Júnior, Lucas Franco Ferreira
Pages: 87 - 100
Number of pages: 14
Current Topics in Analytical Chemistry
Volume 15 

Copyright © 2023 Research Trends. All rights reserved

Different compounds are used for modifications of electrochemical sensors, and a promising new material is borophene (2D-B), 2D material, which consists of a monolayer of boron atoms. This work combines theoretical and experimental approaches to investigate the potential of 2D-B as an electrochemical sensor modifier for enhanced electron transfer, thus favoring the increase in sensor sensitivity. The theoretical study evaluated the contribution of Copper (Cu) as a support for stabilization of 2D-B, donating electrons to 2D-B, avoiding the formation of Borophene oxide. The theoretical study presented evidence that electrical conduction undergoes variation depending on the structure of 2D-B and its β configurations tend to behave like a conductor, even after undergoing a stretching or compression process. Using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) technique, qualitative studies were carried out on the copper electrode modified with 2D-B (Cu/2D-B). The effect of adding 2D-B to the surface of the copper electrode (ECu) in the electronic transfer process was analyzed, using EIS. The polarization resistance decreased. It was 2.776 kΩ cm² for ECu and went down to 1.828 kΩ cm² for Cu/2D-B, providing a reduction in capacitive current. The electrochemically active area was also evaluated after the modification process, using CV, noting an increase of 3.6 times in relation to ECu. The qualitative studies evaluated seven different analytes, namely Parquat, Paracetamol, Ascorbic acid, Hydroquinone, Catechol, Malathion and Uric acid, comparing the increase in oxidation or reduction current in CV, with respect to Cu/2D-B. All analytes showed an increase in faradaic current (if) of at least 150% compared to ECu, except Parquat that showed no significant changes. Therefore, 2D-B is a promising material for modifying copper sensors, presenting good results for detecting certain analytes.
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