@article{1efc0d5e4b6c407397f63762698b41e4,
title = "Hierarchical Materials Design by Pattern Transfer Printing of Self-Assembled Binary Nanocrystal Superlattices",
abstract = "We demonstrate the fabrication of hierarchical materials by controlling the structure of highly ordered binary nanocrystal superlattices (BNSLs) on multiple length scales. Combinations of magnetic, plasmonic, semiconducting, and insulating colloidal nanocrystal (NC) building blocks are self-assembled into BNSL membranes via the liquid-interfacial assembly technique. Free-standing BNSL membranes are transferred onto topographically structured poly(dimethylsiloxane) molds via the Langmuir-Schaefer technique and then deposited in patterns onto substrates via transfer printing. BNSLs with different structural motifs are successfully patterned into various meso- and microstructures such as lines, circles, and even three-dimensional grids across large-area substrates. A combination of electron microscopy and grazing incidence small-angle X-ray scattering (GISAXS) measurements confirm the ordering of NC building blocks in meso- and micropatterned BNSLs. This technique demonstrates structural diversity in the design of hierarchical materials by assembling BNSLs from NC building blocks of different composition and size by patterning BNSLs into various size and shape superstructures of interest for a broad range of applications.",
keywords = "Transfer patterning, binary superlattices, liquid interfacial assembly, nanocrystals, self-assembly",
author = "Taejong Paik and Hongseok Yun and Blaise Fleury and Hong, {Sung Hoon} and Jo, {Pil Sung} and Yaoting Wu and Oh, {Soong Ju} and Matteo Cargnello and Haoran Yang and Murray, {Christopher B.} and Kagan, {Cherie R.}",
note = "Funding Information: We want to acknowledge Advanced Photon Source and the beam scientists of 8-ID-E, Joseph Strzalka and Zhang Jiang, for their help with GISAXS experiments. The authors are grateful for primary support of this work from the Office of Naval Research Multidisciplinary University Research Initiative Award No. ONR-N00014-10-1-0942 for the synthesis NaGdF4 NCs, NC self-assembly, transfer printing, and microscopic analysis. GISAXS measurement and analysis was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering under Award No. DE-SC0002158. Synthesis of FeOx NCs was supported by the Catalysis Center for Energy Innovation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001004. Synthesis of Au NCs was supported by the NatureNet Science Fellowship offered by the Nature Conservancy. CdSe/CdS NCs was supported by the National Science Foundation (NSF) under Award No. NSF CBET-1335821. AFM characterization was supported by and scanning electron microscopy was performed in facilities supported by the NSF MRSEC Program under Award No. DMR-1120901. C.B.M. is grateful for the support of Richard Perry University Professorship. C.R.K. thanks for the support of Stephen J. Angello Professorship. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",
year = "2017",
month = mar,
day = "8",
doi = "10.1021/acs.nanolett.6b04279",
language = "English",
volume = "17",
pages = "1387--1394",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "3",
}