Journal
NANOSCALE
Volume 10, Issue 17, Pages 7898-7904Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr00445e
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Funding
- National NSF [51535005, 11772153, 51472117]
- Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures [MCMS-0416G01, MCMS-0417G01]
- Fundamental Research Funds for the Central Universities [NP2017101, NE2018002]
- 1000 Youth Talent Program
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Two-dimensional (2D) black phosphorus (BP) has attracted broad interests but remains to be synthesized. One of the issues lies in its large number of 2D allotropes with highly degenerate energies, especially 2D blue phosphorus. Here, we show that both nitrogen and hole-carrier doping can lift the energy degeneracy and locate 2D BP in a deep global energy minimum, while arsenic doping favours the formation of 2D blue phosphorus, attributed to a delicate interplay between s-p overlapping and repulsion of lone pairs. Chemically inert substrates, e.g. graphene and hexagonal boron nitride, can be synergic with carrier doping to stabilize the BP further over other 2D allotropes, while frequently used metal substrates severely reduce the stability of 2D BP. These results not only offer new insight into the structural stability of 2D phosphorus but also suggest a promising pathway towards the chemical synthesis of 2D BP.
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