Nanocrystal superlattices as phonon-engineered solids and acoustic metamaterials.

ABSTRACT: Phonon engineering of solids enables the creation of materials with tailored heat-transfer properties, controlled elastic and acoustic vibration propagation, and custom phonon-electron and phonon-photon interactions. These can be leveraged for energy transport, harvesting, or isolation applications and in the creation of novel phonon-based devices, including photoacoustic systems and phonon-communication networks. Here we introduce nanocrystal superlattices as a platform for phonon engineering. Using a combination of inelastic neutron scattering and modeling, we characterize superlattice-phonons in assemblies of colloidal nanocrystals and demonstrate that they can be systematically engineered by tailoring the constituent nanocrystals, their surfaces, and the topology of superlattice. This

SUBMITTER: Yazdani N 

PROVIDER: S-EPMC6748911 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature