Versatile Core–Shell Nanoparticle@Metal–Organic Framework Nanohybrids: Exploiting Mussel-Inspired Polydopamine for Tailored Structural Integration

Abstract

We report a versatile strategy based on the use of multifunctional mussel-inspired polydopamine for constructing well-defined single-nanoparticle@metal–organic framework (MOF) core–shell nanohybrids. The capability of polydopamine to form a robust conformal coating on colloidal substrates of any composition and to direct the heterogeneous nucleation and growth of MOFs makes it possible for customized structural integration of a broad range of inorganic/organic nanoparticles and functional MOFs. Furthermore, the unique redox activity of polydopamine adds additional possibilities to tailor the functionalities of the nanohybrids by sandwiching plasmonic/catalytic metal nanostructures between the core and shell via localized reduction. The core–shell nanohybrids, with the molecular sieving effect of the MOF shell complementing the intrinsic properties of nanoparticle cores, represent a unique class of nanomaterials of considerable current interest for catalysis, sensing, and nanomedicine.

Polydopamine-Enabled Approach toward Tailored Plasmonic Nanogapped Nanoparticles: From Nanogap Engineering to Multifunctionality

“…28 We found that the deposition of PDA on citrate-stabilized Au nanoparticles can be controlled by the starting concentration of dopamine. Transmission electron microscopy (TEM) images (Figures 2a–c and S1) clearly reveal that monodisperse PDA-coated Au nanoparticles (Au@ PDA) with a PDA thickness of 2 to 13 nm were produced after 8 h reaction in bicine buffer (pH 8.5) with a dopamine concentration from 0.025 to 0.2 mg/mL.…”

Facile Synthesis of Magnetic Hierarchical Core–Shell Structured Fe3O4@PDA‐Pd@MOF Nanocomposites: Highly Integrated Multifunctional Catalysts

“…[11][12][13] Metal-organic frameworks (MOFs), emerging as an attractive class of crystalline porous materials with well-assembled active functionalities from metallici ons and organic linkers, would break the above-mentioned limitation of inorganic porous shells owing to their distinguished properties such as facile preparation, diversifiedc omponents and tailorable porosity. [18] Recently,K ee tal. [18] Recently,K ee tal.…”

Encapsulation of Bimetallic Metal Nanoparticles into Robust Zirconium‐Based Metal–Organic Frameworks: Evaluation of the Catalytic Potential for Size‐Selective Hydrogenation

“…In the case of core–shell systems, it is known that the inner metal core significantly influences the external shell of the second metal and therefore provides unique synergetic effects and physicochemical properties . However, so far the exclusive encapsulation of bimetallic NPs with controlled composition into MOFs is challenging and only a few examples are known . The synthesis of such systems includes for example the use of chemical vapor infiltration, decomposition of linker‐bonded metal complexes, or the encapsulation of preformed NPs by a template synthesis .…”