In‐Plane Direct‐Write Assembly of Iridescent Colloidal Crystals
Name
2019DirectWrite_Small_Rev2_submit.pdf
Description
Accepted version
Size
10.29 MB
Format
Unknown
Checksum (MD5)
ee08f5420af45ef596f8d1ee193281b4
Author(s)
Tan, Alvin T. L.
Nagelberg, Sara
Chang‐Davidson, Elizabeth
Tan, Joel
Yang, Joel K. W.
Kolle, Mathias
Hart, A. John
Date Issued
December 2019
Journal
Small
Publisher
Wiley
Version
Author's final manuscript
Abstract
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Materials made by directed self-assembly of colloids can exhibit a rich spectrum of optical phenomena, including photonic bandgaps, coherent scattering, collective plasmonic resonance, and wave guiding. The assembly of colloidal particles with spatial selectivity is critical for studying these phenomena and for practical device fabrication. While there are well-established techniques for patterning colloidal crystals, these often require multiple steps including the fabrication of a physical template for masking, etching, stamping, or directing dewetting. Here, the direct-writing of colloidal suspensions is presented as a technique for fabrication of iridescent colloidal crystals in arbitrary 2D patterns. Leveraging the principles of convective assembly, the process can be optimized for high writing speeds (≈600 µm s−1) at mild process temperature (30 °C) while maintaining long-range (cm-scale) order in the colloidal crystals. The crystals exhibit structural color by grating diffraction, and analysis of diffraction allows particle size, relative grain size, and grain orientation to be deduced. The effect of write trajectory on particle ordering is discussed and insights for developing 3D printing techniques for colloidal crystals via layer-wise printing and sintering are provided.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1002/smll.201905519
