Facile fabrication of two-dimensional inorganic nanostructures and their conjugation to nanocrystals
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- Facile fabrication of two-dimensional inorganic nanostructures and their conjugation to nanocrystals
- Cho, Seungho; Jang, Ji-Wook; Park, Juwon; Jung, Sungwook; Jeong, Sanghwa; Kwag, Jungheon; Lee, Jae Sung; Kim, Sungjee
- Adsorption densities; Chemical compositions; Inorganic nanocrystals; Inorganic nanostructures; Nanocrystal solution; Negative surface charges; Negatively charged; One-pot hydrothermal reaction
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY C, v.1, no.29, pp.4497 - 4504
- Nanocomposites of two-dimensional (2D) inorganic nanosheets and inorganic nanocrystals are fabricated. Freestanding atomically flat gamma-AlOOH nanosheets (thickness <1 nm) are synthesized from a one-pot hydrothermal reaction. The freestanding and binder-free film composed of the gamma-AlOOH nanosheets is fabricated by sedimentation. Because they have positive zeta potentials in the pH range below ca. 9.3, the gamma-AlOOH nanosheets can function as positively charged 2D inorganic matrices in a broad pH range. By solution phase (pH 7.0) mixing of the gamma-AlOOH nanosheets (zeta potential: 30.7 +/- 0.8 mV) and inorganic nanocrystals with negative surface charge, including Au nanoparticles, Au nanorods, CdSe quantum dots, CdSe/CdS/ZnS quantum dots and CdSe nanorods, the nanocomposites are self-assembled via electrostatic interactions. Negatively charged inorganic nanostructures with a wide range of chemical compositions, shapes, sizes, surface ligands and adsorbates can be used as building blocks for gamma-AlOOH nanocomposites. Adsorption densities of inorganic nanocrystals on the nanocomposites can be controlled by varying concentrations of nanocrystal solutions. Nanocomposite films containing alternating layers of gamma-AlOOH and nanocrystals are obtained by a simple drop casting method.
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