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Visualizing Degradation of Black Phosphorus Using Liquid Crystals

Author:
Naqvi, Bilal Abbas   Shehzad, Muhammad Arslan   Cha, Janghwan   Min, Kyung-Ah   Khan, M. Farooq   Hussain, Sajjad   Seo, Yongho   Hong, Suklyun   Eom, Jonghwa   Jung, Jongwan   


Journal:
Scientific Reports


Issue Date:
2018


Abstract(summary):

Black Phosphorus (BP) is an excellent material from the post graphene era due to its layer dependent band gap, high mobility and high I-on/I-off. However, its poor stability in ambient poses a great challenge for its practical and long-term usage. The optical visualization of the oxidized BP is the key and the foremost step for its successful passivation from the ambience. Here, we have conducted a systematic study of the oxidation of the BP and developed a technique to optically identify the oxidation of the BP using Liquid Crystal (LC). It is interesting to note that we found that the rapid oxidation of the thin layers of the BP makes them disappear and can be envisaged by using the alignment of the LC. The molecular dynamics simulations also proved the preferential alignment of the LC on the oxidized BP. We believe that this simple technique will be effective in passivation efforts of the BP, and will enable it for exploitation of its properties in the field of electronics.


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