Passivation of black phosphorus as organic-phase enzyme platform for bisphenol A determination

• Published in: Analytica chimica acta 2020-01, Vol.1095, p.197-203
• Main Authors: Wu, Lidong, Meng, Qingyi, Xu, Zhiyuan, Cao, Qiang, Xiao, Yushi, Liu, Huan, Han, Gang, Wei, Shuhua
• Format: Article
• Language: English
• Subjects: Black phosphorus; Interdigital electrode; Organic phase biosensor; Passivation; Tyrosinase
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2019.10.030

Black phosphorus (BP) has a high charge-carrier mobility (∼1000 cm2 V−1 s−1), but the bare BP degrades rapidly in the presence of oxygen and water which limits the application of the BP. In this study, a simple, non-covalent passivation strategy is developed by modifying of the BP with hexamethylendiamine (HA). The functionalized BP exhibits good stability over 4 weeks. The organic phase interdigital electrode which is constructed by stable HA/BP and tyrosinase displays lowest noise signal (0.025 nA) and relatively low detection limit (10 nmol L−1) for bisphenol A. This work provides a new strategy for construction of novel biofuel cell, bioelectronics and biosensors. •The black phosphorene (BP) are exfoliated by ultrasonication in organic solvent.•The stable BP is functionalized by hexamethylendiamine in organic solvent.•2,5-di-tert-butyl-1,4-benzoquinone is selected as new electrolyte.•The detection limit (10 nmol L−1) and the noise (0.025 nA) of this biosensor is the lowest among the reported biosensors.•This biosensor retains over 65% of initial response signal after 180-day storage.