Abstract
Over the past few decades, two-dimensional (2D) and layered materials have emerged as new fields. Due to the zero-band-gap nature of graphene and the low photocatalytic performance of MoS2, more advanced semiconducting 2D materials have been prompted. As a result, semiconductor black phosphorus (BP) is a derived cutting-edge post-graphene contender for nanoelectrical application, because of its direct-band-gap nature. For the first time, we report on robust BP@TiO2 hybrid photocatalysts offering enhanced photocatalytic performance under light irradiation in environmental and biomedical fields, with negligible affected on temperature and pH conditions, as compared with MoS2@TiO2 prepared by the identical synthesis method. Remarkably, in contrast to pure few layered BP, which, due to its intrinsic sensitivity to oxygen and humidity was readily dissolved after just several uses, the BP@TiO2 hybrid photocatalysts showed a ~92% photocatalytic activity after 15 runs. Thus, metal-oxide-stabilized BP photocatalysts can be practically applied as a promising alternative to graphene and MoS2.
Highlights
Correspondence and requests for materials should be addressed to Stable semiconductor black phosphorus (BP)@titanium dioxide (TiO2) hybrid photocatalysts
We report on robust BP@TiO2 hybrid photocatalysts offering enhanced photocatalytic performance under light irradiation in environmental and biomedical fields, with negligible affected on temperature and pH conditions, as compared with MoS2@TiO2 prepared by the identical synthesis method
A high-resolution transmission electron microscopy (HR-TEM) image of TiO2 substituted onto the BP surface reveals clearly distinct defects (Supplementary Fig. 1, yellow arrows)[22], exactly corresponding to the modelling of the BP@TiO2 hybrid system (Fig. 1B), as looking like irregularly contained eggs (TiO2) in the tray
Summary
Correspondence and requests for materials should be addressed to Stable semiconductor black phosphorus (BP)@titanium dioxide (TiO2) hybrid photocatalysts. Graphene has been widely and intensively developed for electronic and optical device applications[6,7,8], limitations in its semi-metallic characteristics are emerging These days, black phosphorus (BP) is a cutting-edge material due to its direct band-gap nature (i.e., ,2.0 eV for several layers and ,0.3 eV for the single layer, mainly depending on exfoliation of BP layers)[2,3]. Several-layer BP crystals have been reported to demonstrate single-sheet-BP (i.e., phosphorene) practical feasibility[1,2], showing, compared with the graphene- and MoS2-based alternatives[3,4], higher carrier mobility and both p- and n-type configurations in field-effect transistor (FET) sensors[12]. Taking into consideration semiconducting few layered BP and intercalation of TiO2 into a BP-layer system (BP@TiO2 hybrid) by one-pot reaction at room temperature, and comparing that system with an MoS2@TiO2 hybrid system fabricated by the identical preparation method, intriguingly novel photocatalytic performances over those of the traditional graphene-TiO2 hybrid photocatalytic composites[15,16,17,18,19] were demonstrated
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