Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation
Abstract
Isopycnic density gradient ultracentrifugation (iDGU) has been widely applied to sort nanomaterials by their physical and electronic structure. Yet, the commonly used density-gradient medium iodixanol has a finite maximum buoyant density that prevents the use of iDGU for high-density nanomaterials. Here, we overcome this limit by adding cesium chloride (CsCl) to iodixanol, thus increasing its maximum buoyant density to the point where the high-density two-dimensional nanomaterial rhenium disulfide (ReS2) can be sorted in a layer-by-layer manner with iDGU. The resulting aqueous ReS2 dispersions show photoluminescence at ~1.5 eV, which is consistent with its direct bandgap semiconductor electronic structure. Moreover, photocurrent measurements on thin films formed from solution-processed ReS2 show a spectral response that is consistent with optical absorbance and photoluminescence data. In addition to offering a pathway for effective solution processing of ReS2, this work establishes a general methodology for sorting high-density nanomaterials via iDGU.
- Authors:
-
- Northwestern Univ., Evanston, IL (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)
- OSTI Identifier:
- 1388164
- Grant/Contract Number:
- SC0001059; DMR-1505849; DMR-1121262; N00014-14-1-0669
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: 11; Related Information: ANSER partners with Northwestern University (lead); Argonne National Laboratory; University of Chicago; University of Illinois, Urbana-Champaign; Yale University; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Two-dimensional nanomaterials; liquid-phase exfoliation; iodixanol; cesium chloride; photoluminescence; photocurrent
Citation Formats
Kang, Joohoon, Sangwan, Vinod K., Wood, Joshua D., Liu, Xiaolong, Balla, Itamar, Lam, David, and Hersam, Mark C. Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation. United States: N. p., 2016.
Web. doi:10.1021/acs.nanolett.6b03584.
Kang, Joohoon, Sangwan, Vinod K., Wood, Joshua D., Liu, Xiaolong, Balla, Itamar, Lam, David, & Hersam, Mark C. Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation. United States. https://doi.org/10.1021/acs.nanolett.6b03584
Kang, Joohoon, Sangwan, Vinod K., Wood, Joshua D., Liu, Xiaolong, Balla, Itamar, Lam, David, and Hersam, Mark C. Tue .
"Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation". United States. https://doi.org/10.1021/acs.nanolett.6b03584. https://www.osti.gov/servlets/purl/1388164.
@article{osti_1388164,
title = {Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation},
author = {Kang, Joohoon and Sangwan, Vinod K. and Wood, Joshua D. and Liu, Xiaolong and Balla, Itamar and Lam, David and Hersam, Mark C.},
abstractNote = {Isopycnic density gradient ultracentrifugation (iDGU) has been widely applied to sort nanomaterials by their physical and electronic structure. Yet, the commonly used density-gradient medium iodixanol has a finite maximum buoyant density that prevents the use of iDGU for high-density nanomaterials. Here, we overcome this limit by adding cesium chloride (CsCl) to iodixanol, thus increasing its maximum buoyant density to the point where the high-density two-dimensional nanomaterial rhenium disulfide (ReS2) can be sorted in a layer-by-layer manner with iDGU. The resulting aqueous ReS2 dispersions show photoluminescence at ~1.5 eV, which is consistent with its direct bandgap semiconductor electronic structure. Moreover, photocurrent measurements on thin films formed from solution-processed ReS2 show a spectral response that is consistent with optical absorbance and photoluminescence data. In addition to offering a pathway for effective solution processing of ReS2, this work establishes a general methodology for sorting high-density nanomaterials via iDGU.},
doi = {10.1021/acs.nanolett.6b03584},
journal = {Nano Letters},
number = 11,
volume = 16,
place = {United States},
year = {Tue Oct 04 00:00:00 EDT 2016},
month = {Tue Oct 04 00:00:00 EDT 2016}
}
Web of Science
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