English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report a rapid and safe procedure for the synthesis of black phosphorus (BP) by the chemical transport reaction (CTR) method and a purification procedure for the as-prepared BP. Frequent explosion of glass ampules containing reactants (red P, Sn, and SnI 4 ) during high-temperature annealing in the CTR method is inevitable. We found that any danger from the explosions can be prevented by enclosing the glass ampule in a flange-fitted stainless-steel tube without compromising the yield and the quality of BP. In contrast to prolonged heating at approximately 823 K, the BP crystals can be synthesized by immediately cooling (100 K/h) to 400 K after heating the glass ampule to the desired highest temperature (∼823-873 K) over 2 h. The minimum time required for BP synthesis is estimated to be approximately 5 h. The as-prepared BP predominantly contains Sn and I impurities on the upper layers of the BP flakes. These impurities can be removed by exfoliating the upper layers of the flakes or by combining vacuum annealing at ∼600 K and HCl treatment.

Safe and Fast Synthesis of Black Phosphorus and Its Purification