Stretchable Electronic and Photonic Materials from Self-Organized Nanoparticles.

Self-Assembly;Layer-by-Layer Assembly;Stretchable Conductors;Chiroptical Nanocomposites;Electronic and Plasmonic Properties of Metallic Nanoparticles;Nanotechnology;Chemical Engineering;Engineering;Chemical Engineering

Kim, YoonseobLahann, Joerg ;

University of Michigan

关键词: Self-Assembly;    Layer-by-Layer Assembly;    Stretchable Conductors;    Chiroptical Nanocomposites;    Electronic and Plasmonic Properties of Metallic Nanoparticles;    Nanotechnology;    Chemical Engineering;    Engineering;    Chemical Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/135856/yoonseob_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Nanoscale science and technologies have been developed tremendously during the last two decades, introducing a variety of nanomaterials with unique properties.However, incorporation of these properties into macroscale functional applications has been limited.An essential challenge is the integration of such unique properties into assemblies for macroscale devices.Here we explore self-organization of nanomaterials in solid-state for discovering fundamental understandings of mechanisms and dynamics for various engineering applications. An example of excellent stretchable conductors from self-organization of nanoparticles (NPs) was first demonstrated.Free-standing stretchable conductors were prepared using layer-by-layer (LBL) assembly and vacuum-assisted flocculation (VAF).Different properties of LBL and VAF were understood from the perspective of structure and property relations.High conductivity and stretchability were observed from both composites, and the properties originated from dynamic self-organization of NPs.Modified percolation theory allowed incorporation of the self-organization and provided an excellent match with experimental data.Stretchable and conductive composites under voltage application provided an additional practical aspect of the composites, damping of vibrations.Another self-organization of NPs first demonstrated chiroptical nanocomposites for applications of photonic material devices and optoelectronics.They were also LBL assembled, from plasmonic NPs and single-walled carbon nanotubes (SWNTs).A straightforward sample preparation method, conformal deposition of plasmonic materials on pre-twisted substrates, is a distinctive advantage when producing macroscale photonic materials.Chiroptical activities can be increased up to ten fold and were reversibly tunable.S-like 3D nano-assemblies were responsible for the optical activities and this was confirmed by computational simulations.Universality of the method was confirmed by introducing polymeric fluorescence beads and SWNTs.Deposition of SWNTs expanded the wavelength regimes from UV to near-IR.Solid-state self-organization at the nexus of mechanics, electronics, and excitonics/plasmonics can be generalized to other nanoscale materials and opens new possibilities for composite-based electronic and optic devices.