4.7 Article

Enhanced voltammetric performance of sensors based on oxidized 2D layered black phosphorus

期刊

TALANTA
卷 238, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.talanta.2021.123036

关键词

2D materials; Black phosphorus; Oxidized black phosphorus; Dopamine; Screen-printed electrodes; Voltammetry

资金

  1. Ministry of Science and Innovation of Spain [PID2019-107102RB-C22]
  2. Generalitat of Cata-lunya [2017SGR311]
  3. Peruvian National Program of Scholarships and Student Loans (PRONABEC)
  4. Water Research Institute (IdRA) of the University of Barcelona
  5. Czech Science Foundation [19-26910X]

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This study demonstrates that exposing BP-based working electrodes to normal ambient conditions can enhance the performance of voltammetric sensing applications, with oxidized BP-SPCE showing improved analytical performance. The results highlight the potential of preparing and using BP-based sensors in normal ambient settings, with promising applications under physiological conditions.
The exceptional properties of 2D layered black phosphorus (BP) make it a promising candidate for electrochemical sensing applications and, even though BP is considered unstable and tends to degrade by the presence of oxygen and moisture, its oxidation can be beneficial in some situations. In this work, we present an unequivocal demonstration that the exposition of BP-based working electrodes to normal ambient conditions can indeed be advantageous, leading to an enhancement of voltammetric sensing applications. This point was proved using a BP modified screen-printed carbon electrode (BP-SPCE) for the voltammetric determination of dopamine (DA) as a model target analyte. Oxidized BP-SPCE (up to 35% of PxOy at the surface) presented an enhanced analytical performance with a 5-fold and 2-fold increase in sensitivity, as compared to bare-SPCE and nonoxidized BP-SPCE stored in anhydrous atmosphere, respectively. Good detection limit, repeatability, reproducibility, stability, selectivity, and accuracy were also achieved. Overall, the results presented herein display the prominent possibilities of preparing and working with BP based-sensors in normal ambient settings and showcase their implementation under physiological conditions.

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