Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program King Abdulaziz City for Science and Technology P.O Box 6086, Riyadh 11442, Saudi Arabia.
Department of Electrical Engineering 3740 McClintock Avenue University of Southern California, Los Angeles, CA, 90089, USA.
Sci Rep. 2017 Mar 20;7:44540. doi: 10.1038/srep44540.
Layered black phosphorus has drawn much attention due to the existence of a band gap compared to the widely known graphene. However, environmental stability of black phosphorus is still a major issue, which hinders the realization of practical device applications. Here, we spatially Raman map exfoliated black phosphorus using confocal fast-scanning technique at different time intervals. We observe a Raman intensity modulation for , B, and modes. This Raman modulation is found to be caused by optical interference, which gives insights into the oxidation mechanism. Finally, we examine the fabrication compatible PMMA coating as a viable passivation layer. Our measurements indicate that PMMA passivated black phosphorus thin film flakes can stay pristine for a period of 19 days when left in a dark environment, allowing sufficient time for further nanofabrication processing. Our results shed light on black phosphorus degradation which can aid future passivation methods.
层状黑磷由于存在带隙而备受关注，与广为人知的石墨烯相比。然而，黑磷的环境稳定性仍然是一个主要问题，这阻碍了实际器件应用的实现。在这里，我们使用共焦快速扫描技术在不同的时间间隔对剥离的黑磷进行空间拉曼映射。我们观察到 、B 和 模式的拉曼强度调制。这种拉曼调制被发现是由光学干涉引起的，这为氧化机制提供了深入的了解。最后，我们研究了与制造兼容的 PMMA 涂层作为可行的钝化层。我们的测量表明，当保存在黑暗环境中时，PMMA 钝化的黑磷薄膜薄片可以保持完整长达 19 天，这为进一步的纳米制造处理提供了足够的时间。我们的结果揭示了黑磷降解的情况，这有助于未来的钝化方法。
