Langmuir film formation is a convenient and highly efficient method for preparing monolayers of molecules as well as particulates. In the past a roadblock to preparation of high-quality, large area films of exfoliated nanomaterials has been a mismatch between solvents that are good for exfoliation, and those that are good for Langmuir film spreading. There has also been significant emphasis placed on the pressure-surface area isotherms in Langmuir experiments with nanomaterial films, despite there being good reasons why these materials should not behave in the manner traditionally associated with monolayers of amphiphilic molecules.<br/><br/>We describe the techniques we have developed to prepare high-coverage films of exfoliated layered materials, including graphene, boron nitride, molybdenum disulfide, and molybdenum diselenide. We investigate dispersions and films through a range of microscopic and spectroscopic methods in order to understand particle re-aggregation during deposition. We present developments towards the preparation of large-area, photo-active devices.

Langmuir films of layered materials: Towards large-area devices

255th National Meeting (2018)

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