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Research Highlight | Argonne National Laboratory

Single-crystal, 2D covalent organic frameworks

In a study published in Science, researchers’ findings enable a broad exploration of synthetic 2D polymer structures and properties. This work was a multidisciplinary team effort including DOE’s CNM and APS user facilities at Argonne.

Scientific Achievement

Two-dimensional covalent organic frameworks (COFs) previously have been polycrystalline, insoluble powders that impede characterization. Here, single crystal, 2D COF particles of controlled sizes were synthesized. The materials form stable colloidal solutions that permit optical investigation.

Significance and Impact

High quality, 2D COF materials with controlled size permit optoelectronic study. Size-dependent exciton-exciton annihilation characterization for single crystal domains relates long-range exciton diffusion.

Research Details

  • Transient absorption spectroscopy was performed at the Center for Nanoscale Materials for multiple COF sizes.
  • Synthesis and structural characterization were performed at Northwestern University and the Advanced Photon Source.

DOI: 10.1126/science.aar7883

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Work was performed in part at the Center for Nanoscale Materials and the Advanced Photon Source.

Transient measurements relate size-dependent exciton annihilation owing to diffusion.

About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.ener​gy​.gov/​b​e​s​/​s​u​f​/​u​s​e​r​-​f​a​c​i​l​i​t​i​e​s​/​n​a​n​o​s​c​a​l​e​-​s​c​i​e​n​c​e​-​r​e​s​e​a​r​c​h​-​c​e​n​ters/.

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