Recently, boron nitride (BN)chains have been made from hexagonal BN sheets. However, the BN sheet has a large band gap, which is not suitable to be used as the electrode material of BN chain-based two-dimensional (2D)electronic devices. The successful preparation of borophene sheets opens a possible way for building BN chain-based 2D devices. The borophene is a metal material with strong oxidation resistance. In particular, recent experimental results show that the borophene exists massless Dirac fermions, which makes it a suitable candidate fo...
