Hierarchical Materials Design by Pattern Transfer Printing of Self-Assembled Binary Nanocrystal Superlattices.
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.
School of Integrative Engineering, Chung-Ang University , Seoul, 06974, South Korea.
Taejong
0000-0003-0111-8513
T
Paik
Hongseok
0000-0003-0497-6185
H
Yun
Blaise
B
Fleury
Electronics and Telecommunications Research Institute , Daejeon, 34129, South Korea.
Sung-Hoon
SH
Hong
Complex Assemblies of Soft Matter, CNRS-SOLVAY-PENN UMI 3254 , Bristol, Pennsylvania 19007, United States.
Pil Sung
PS
Jo
Yaoting
0000-0002-4363-9870
Y
Wu
Department of Materials Science and Engineering, Korea University , Seoul 02841, South Korea.
Soong-Ju
0000-0003-1434-8844
SJ
Oh
Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University , Stanford, California 94305, United States.
Matteo
M
Cargnello
Haoran
H
Yang
Christopher B
CB
Murray
Cherie R
CR
Kagan
Transfer patterning; binary superlattices; liquid interfacial assembly; nanocrystals; self-assembly