Direct Gas Phase Synthesis of High Purity Black Arsenic Phosphorus with Non-Metallic Mineralizer

2D black arsenic phosphorus (b-AsP) is a promising candidate for infrared photodetectors. However, directly synthesizing high-purity b-AsP crystals under the existing system is an intractable task. Herein, we report a novel system for synthesizing high-purity b-AsP crystals using non-metallic mineralizer. A small amount of I2 was chosen as the sole additive for the synthesis of b-AsP to avoid metal by-products, and impurities were removed through the reverse heating program after the reaction. Through optimization of process condi-tions, the efficient conversion rate of b-AsP was > 99%, and the purity of b-AsP crystal was as high as > 99.9% with favorable crystal form, diameter of similar to 5 mm, and typical polycrystalline characteristics. The entire synthesis process took only 15 h. This facile and green route for b-AsP crystals synthesis might be expected to replace the existing b-AsP synthesis system and provide theoretical guidance for breakthroughs in the synthesis reaction mechanism of b-AsP materials.(c) 2023 Elsevier B.V. All rights reserved.