Self-Assemblies of Gold Nanocrystals: Unexpected Properties

This is the authors' abstract. We don't add key points for this paper.

In the nanoworld, Au nanocrystal properties have been heavily investigated. Here, we concentrate on some unexpected properties related to either nanocrystals themselves (1D) or their self-assemblies in 3D superlattices called supracrystals. Some specific properties related to the crystalline structure of nanocrystals called nanocrystallinity are highlighted. Simultaneous homogeneous and heterogeneous supracrystal growth processes are produced. A marked difference in their mechanical properties is due to the supracrystal growth process and to building block nanocrystallinity. Electronic transport process through a very thick supracrystal (up to 10 μm) is observed. Furthermore, the Coulomb oscillations of the building blocks take place confirming the fingerprint of nanocrystals in a supracrystal. A new concept is proposed to disperse hydrophobic supracrystals in aqueous solution. “Nanoheaters” are produced by subjecting supracrystals dispersed in aqueous solution to light. We end this perspective by pointing out some questions remaining open that might be highly useful for potential applications.