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Controlled Interactions between Two Dimensional Layered Inorganic Nanosheets and Polymers

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[Technical Report, Final Report]

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Layered inorganic materials LIMs such as transition metal dichalcogenides TMDs eg., MoS2, WS2, MoSe2, ZrTe2, transition metal oxides TMOseg. Ti oxides, Nb oxides and boron nitride BN have been of great attraction due to their unique structures and intriguing properties. The layer-dependent properties of LIMs varying from topological insulators to wide-gap semiconductors and metals have endow exciting prospects for a variety of emerging applications in a broad range of fields, such as electronics, energy conversion and storage, catalysis and polymer nanocomposites PNCs. In particular, the preparation of PNCs with good dispersion of LIM nanosheets within the polymer matrix is of prime importance to realize the intrinsic properties of individual sheets of LIM. In this report, we demonstrate the physical and chemical interactions of two-dimensional nanosheets of LIMs with polymers with the emphasis on controlling the interactions by designing the molecular and architectural structures of the polymers for potential practical applications such as nanocomposites and thin film fabrications. Our approaches are based on the modification of LIMs with end-functionalized polymers. First, an end-functionalized polymer with conjugated end-molecule, pyrene, is successfully employed to boron nitride nanosheets BNNS, and non-covalent interaction arising from pi-pi interaction gives rise to well dispersed BNNS with high concentration. Second, the non-destructive modification of TMDs sheets with amine-terminated polymers is introduced and the strong Lewis acid-base interaction between transition metal and non-pair electrons of amine allows us to develop scalable, stable and uniform composite films with numerous combinations of TMD nanosheets and end-functionalized polymers.

Subject Categories:

  • Polymer Chemistry
  • Laminates and Composite Materials
  • Inorganic Chemistry

Distribution Statement:

[A, Approved For Public Release]