期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 31, 页码 9131-9135出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705012
关键词
black phosphorus; degradation; density functional calculations; surface chemistry; water-catalyzed oxidation
资金
- Ministry of Science and Technology [2017YFA0204800]
- NSFC [21573156, 21525311, 21373045]
- Singapore MOE Grant [R143-000-652-112]
- National Science Foundation of SZU [2017029]
- Singapore National Research Foundation, Prime Minister's Office
Black phosphorus (BP) shows great potential in electronic and optoelectronic devices owing to its semi-conducting properties, such as thickness-dependent direct bandgap and ambipolar transport characteristics. However, the poor stability of BP in air seriously limits its practical applications. To develop effective schemes to protect BP, it is crucial to reveal the degradation mechanism under various environments. To date, it is generally accepted that BP degrades in air via light-induced oxidation. Herein, we report a new degradation channel via water-catalyzed oxidation of BP in the dark. When oxygen co-adsorbs with highly polarized water molecules on BP surface, the polarization effect of water can significantly lower the energy levels of oxygen (i.e. enhanced electron affinity), thereby facilitating the electron transfer from BP to oxygen to trigger the BP oxidation even in the dark environment. This new degradation mechanism lays important foundation for the development of proper protecting schemes in black phosphorus-based devices.
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