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Polyrotaxane‐Mediated Self‐Assembly of Gold Nanospheres into Fully Reversible Supercrystals |
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| Authors: | Joao Paulo Coelho Guillermo González‐Rubio Annette Delices Prof. José Osío Barcina Cástor Salgado Dr. David Ávila Dr. Ovidio Peña‐Rodríguez Prof. Gloria Tardajos Dr. Andrés Guerrero‐Martínez |
| Affiliation: | 1. Departamento de Química Física I, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid (Spain);2. Departamento de Química Orgánica I, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid (Spain);3. Departamento de Química Inorgánica, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid (Spain);4. Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, 28006, Madrid (Spain) |
| Abstract: | The use of a thiol‐functionalized nonionic surfactant to stabilize spherical gold nanoparticles in water induces the spontaneous formation of polyrotaxanes at the nanoparticle surface in the presence of the macrocycle α‐cyclodextrin. Whereas using an excess of surfactant an amorphous gold nanocomposite is obtained, under controlled drying conditions the self‐assembly between the surface supramolecules provides large and homogenous supercrystals with hexagonal close packing of nanoparticles. Once formed, the self‐assembled supercrystals can be fully redispersed in water. The reversibility of the crystallization process may offer an excellent reusable material to prepare gold nanoparticle inks and optical sensors with the potential to be recovered after use. |
| Keywords: | cyclodextrins gold nanoparticles rotaxanes self‐assembly |