Mechanism and Interface Study of One-to-one Metal NP/MetalOrganic Framework Core-shell Structure
2017
The core-shell hybrid structure is the simplest motif
of two-component systems which consists of an inner core coated by
an outer shell. Core-shell composite materials are attractive for
their biomedical, electronic and catalytic applications in which
interface between core and shell is critical for various
functionalities. However, it is still challenging to study the
exact role that interface plays during the formation of the
core-shell structures and in the properties of the resulted
materials. By studying the formation mechanism of a well interface
controlled one-to-one metal nanoparticle (NP)@zeolite imidazolate
framework-8 (ZIF-8) core-shell material, we found that the
dissociation of capping agents on the NP surface results in direct
contact between NP and ZIF-8, which is essential for the formation
of core-shell structure. And the amount of capping agents on the NP
surface has a significant effect to the crystallinity and stability
of ZIF-8 coating shell. Guided by our understanding to the
interface, one-to-one NP@UiO-66 core-shell structure has also been
achieved for the first time. We believe that our research will help
the development of rational design and synthesis of core-shell
structures, particularly in those requiring good interface
controls.
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