Preparation And Performance Of Ordered Lb Film Based On Black Phosphor Nanosheets And Organic Small Molecule Assembly Units

Molecular self-assembly is a supermolecular system with special functions based on molecular recognition.It is a system formed by weak,reversible non-covalent forces Langmuir-Blodgett(LB)technology is a way of self-assembly of molecules at the gas-liquid interface.The composite membrane material prepared by Langmuir-Blodgett(LB)technology has good physical and chemical properties and wide application value Black phosphorus(BP)is a two-dimensional material similar to graphene.Due to its unique structure,it has great potential value in the fields of catalysis,energy,sensing,biomedicine and other fields.Therefore,researches on the functionalization of black phosphorus are essential for the development of self-assembled nanomaterials.In this paper,a composite membrane of chemically modified black phosphorus nano sheets(f-BPNSs)and dyes was successfully designed and prepared by Langmuir-Blodgett(LB)technology,and its self-assembly mechanism and properties of supermolecular materials were studied.First,in order to make better use of the characteristics of BP,it was exfoliated to form BP nanosheets(BPNSs),and then the surface is modified with 4-azidobenzoic acid to obtain modified BP nanosheets(f-BPNSs)to maintain BP nanosheets Stability in the environment.A composite film based on black phosphorus(BP)and dye was prepared by Langmuir-Blodgett(LB)technology.Ultraviolet-visible spectroscopy,transmission electron microscopy(TEM),atomic force microscopy(AFM)and other characterizations proved the successful preparation of the composite film.In addition,the obtained f-BPNSs-dye composite LB film showed good sensitivity to acid and alkali gas.The results of surface-enhanced Raman scattering(SERS)showed that the f-BPNSs-dye composite film had surface-enhancing properties for Rhodamine 6G(R6G)molecules The current work offers new clues for the development of BP-based self-assembled membrane material gas sensors and SERSIn addition,cholesterol derivative molecules have become an attractive Initial material or model system in the field of organic synthesis due to their characteristics of easy derivation and low cost.In this paper,LB membranes of cholesterol derivatives(CHAM)with ?-cyclodextrin and ?-cyclodextrin polymers were prepared by Langmuir-Blodgett(LB)technology.And then,the variable self-assembly and host-guest recognition mechanism between CHAM and cyclodextrin compounds(?-cyclodextrin and poly-?-cyclodextrin)were researched.The prepared LB film was characterized by atomic force microscopy,infrared spectroscopy,ultraviolet spectroscopy and transmission electron microscopy.It was found that the orderly ultrathin films were formed by molecule self-assembly in the two-dimensional gas-liquid interface and the adamantyl group was inserted into the cavity of cyclodextrins to form the inclusion complexes.In addition,the obtained CHAM-poly-?-cyclodextrin composite film has good photoelectric performance.