Protection mechanism of N,N-dimethylformamide on stability of few-layer black phosphorus

Frontiers in Environmental Science

Environmental Science

Siyu Zhang¹  Wenhao Lou¹  Xuejiao Zhang¹  Qing Zhao²  Bin Qin³  Lei Lei³  Baoshan Xing⁴ 

[1] Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China;Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China;Key Laboratory of Integrated Agro-Environmental Pollution Control and Management, Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou, China;China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, GuangZhou, China;Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China;University of Chinese Academy of Sciences, Beijing, China;Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, United States;

关键词: few-layer black phosphorus;    N,N-dimethylformamide;    electrostatic interaction;    protection mechanism;    hydrolysis of phosphorus oxides;   

DOI  :  10.3389/fenvs.2023.1075842

 received in 2022-10-21, accepted in 2023-01-13,  发布年份 2023

来源: Frontiers

【 摘 要 】

Few-layer black phosphorus (LBP) has been widely investigated for its unique optical and electronic properties. As degradation of LBP in ambient conditions largely limited its practical applications, numerous stabilization methods were developed. Understanding stabilization mechanism is essential to development of new protection technologies for LBP. Herein, protection mechanism of the most wildly used exfoliation solvent N,N-dimethylformamide (DMF) on LBP was investigated. DMF was found to accelerate color fading of LBP in aerobic water solution. Nevertheless, dissolvable phosphorus generated from degradation of LBP in the presence of DMF accounted for only 52%–57% of that generated in the absence of DMF. By measuring kinetics constants and activation energies of the degradation reactions, the protection mechanism of DMF was attributed to impede hydrolysis of phosphorus oxides. This was caused by occupation of oxidation sites on LBP by DMF through electrostatic interaction. Insoluble phosphorus oxides in addition to dissolvable phosphorus were observed in DMF exfoliated LBP aqueous solution, providing further evidence for hydrolysis impeding mechanism. This finding threw mechanism light on protection effects of DMF on LBP, providing new knowledge for development of effective stabilization technologies of LBP.

【 授权许可】

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Copyright © 2023 Lei, Zhang, Lou, Zhang, Qin, Zhao and Xing.