Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 608, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125616
Keywords
Black phosphorus; Surface modification; Langmuir-Blodgett film; Gas sensor
Categories
Funding
- National Natural Science Foundation of China [21872119, 22072127]
- Talent Engineering Training Funding Project of Hebei Province [A201905004]
- Research Program of the College Science and Technology of Hebei Province [ZD2018091]
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Research on modifying and functionalizing black phosphorus materials has become increasingly popular in recent years. By using 4-azidobenzoic acid to modify few-layers BP nanosheets, the stability of BP was significantly improved. The composite Langmuir-Blodgett film of f-BPNS and dye molecules showed good sensitivity and high stability to acid and alkali gases.
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 pi-pi 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.
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