Abstract In recent years, the researches on the modification and functionalization of black phosphorus (BP) materials have attracted more and more attention. In this study, few-layers BP nanosheets (BPNS) were prepared by a simple liquid exfoliation method. However, BPNS has the disadvantages of easy oxidation and poor stability, which will also affect the performance of BP. Therefore, 4-azidobenzoic acid was used to modify the BPNS to improve the stability of BP. In addition, 4-azidobenzoic acid modified BPNS (f-BPNS) and dye molecules can form a composite Langmuir-Blodgett (LB) film through electrostatic interaction or π-π stacking forces. UV–vis, Atomic force microscopy (AFM) and other characterizations were used to prove the successful preparation of the f-BPNS-dye composite LB film. It should be noted that the obtained uniform and dense composite films showed good sensitivity to acid and alkali gas. Moreover, the f-BPNS-dye composite films can still maintain high performance after 10 cycles of acid-alkali tests, indicating that the prepared films have high stability. This work provides a new direction for the preparation of new two-dimensional composite materials and their application in gas sensors.

中文翻译：

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自组装黑磷基复合LB薄膜作为新型化学气体传感器的简便制备

摘要 近年来，黑磷（BP）材料的改性和功能化研究越来越受到关注。在这项研究中，通过简单的液体剥离方法制备了几层 BP 纳米片（BPNS）。但BPNS存在易氧化、稳定性差的缺点，也会影响BP的性能。因此，使用4-叠氮苯甲酸对BPNS进行改性以提高BP的稳定性。此外，4-叠氮苯甲酸修饰的BPNS（f-BPNS）和染料分子可以通过静电相互作用或π-π堆积力形成复合Langmuir-Blodgett（LB）薄膜。UV-vis、原子力显微镜（AFM）和其他表征被用来证明 f-BPNS-染料复合 LB 薄膜的成功制备。需要指出的是，所得均匀致密的复合薄膜对酸碱气体表现出良好的敏感性。此外，f-BPNS-染料复合薄膜经过10次酸碱循环测试后仍能保持高性能，表明制备的薄膜具有较高的稳定性。该工作为新型二维复合材料的制备及其在气体传感器中的应用提供了新的方向。