Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation

Joohoon Kang, Vinod K. Sangwan, Joshua D. Wood, Xiaolong Liu, Itamar Balla, David Lam, Mark C Hersam

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Isopycnic density gradient ultracentrifugation (iDGU) has been widely applied to sort nanomaterials by their physical and electronic structure. However, 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. Furthermore, 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 providing a pathway for effective solution processing of ReS2, this work establishes a general methodology for sorting high-density nanomaterials via iDGU.

Original languageEnglish
Pages (from-to)7216-7223
Number of pages8
JournalNano Letters
Volume16
Issue number11
DOIs
Publication statusPublished - Nov 9 2016

Fingerprint

Rhenium
rhenium
disulfides
classifying
Sorting
Nanostructured materials
Disulfides
gradients
Electronic structure
Photoluminescence
Cesium
Photocurrents
Dispersions
Energy gap
Semiconductor materials
Thin films
Ultracentrifugation
rhenium sulfide
electronic structure
photoluminescence

Keywords

  • cesium chloride
  • iodixanol
  • liquid-phase exfoliation
  • photocurrent
  • photoluminescence
  • Two-dimensional nanomaterials

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Layer-by-Layer Sorting of Rhenium Disulfide via High-Density Isopycnic Density Gradient Ultracentrifugation. / Kang, Joohoon; Sangwan, Vinod K.; Wood, Joshua D.; Liu, Xiaolong; Balla, Itamar; Lam, David; Hersam, Mark C.

In: Nano Letters, Vol. 16, No. 11, 09.11.2016, p. 7216-7223.

Research output: Contribution to journalArticle

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. In: Nano Letters. 2016 ; Vol. 16, No. 11. pp. 7216-7223.
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