Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, 230026, China.
CAS Key Laboratory of Materials for Energy Conversion, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Nat Commun. 2018 Oct 9;9(1):4177. doi: 10.1038/s41467-018-06437-1.
Few-layer black phosphorus (BP) with an anisotropic two-dimensional (2D)-layered structure shows potential applications in photoelectric conversion and photocatalysis, but is easily oxidized under ambient condition preferentially at its edge sites. Improving the ambient stability of BP nanosheets has been fulfilled by chemical functionalization, however this functionalization is typically non-selective. Here we show that edge-selective functionalization of BP nanosheets by covalently bonding stable C molecules leads to its significant stability improvement. Owing to the high stability of the hydrophobic C molecule, C functions as a sacrificial shield and effectively protects BP nanosheets from oxidation under ambient condition. C bonding leads to a rapid photoinduced electron transfer from BP to C, affording enhanced photoelectrochemical and photocatalytic activities. The selective passivation of the reactive edge sites of BP nanosheets by sacrificial C molecules paves the way toward ambient processing and applications of BP.
少层黑磷（BP）具有各向异性的二维（2D）层状结构，在光电转换和光催化方面显示出潜在的应用，但在环境条件下很容易在其边缘优先被氧化。通过化学功能化可以提高 BP 纳米片的环境稳定性，但这种功能化通常是非选择性的。在这里，我们展示了通过共价键合稳定的 C 分子对 BP 纳米片进行边缘选择性功能化，可以显著提高其稳定性。由于疏水 C 分子的高稳定性，C 分子充当牺牲性屏蔽层，在环境条件下有效地保护 BP 纳米片免受氧化。C 键合导致光诱导电子从 BP 快速转移到 C，从而赋予增强的光电化学和光催化活性。通过牺牲性 C 分子对 BP 纳米片的反应性边缘位点进行选择性钝化，为 BP 的环境处理和应用铺平了道路。
