Etching of transition metal dichalcogenide monolayers into nanoribbon arrays

Wang, Zixing; Zhang, Xiang; Hachtel, Jordan A.; Apte, Amey; Tiwary, Chandra S.; Vajtai, Robert; Idrobo, Juan Carlos; Ozturk, Ramazan; Ajayan, Pulickel

doi:10.1039/C8NH00364E

Title: Etching of transition metal dichalcogenide monolayers into nanoribbon arrays

Journal Article · Fri Jan 18 00:00:00 EST 2019 · Nanoscale Horizons

DOI:https://doi.org/10.1039/C8NH00364E· OSTI ID:1524868

^[1]; Zhang, Xiang ^[1];

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^[1]; Tiwary, Chandra S. ^[1];

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Rice Univ., Houston, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rice Univ., Houston, TX (United States); Univ. of Szeged, Szeged (Hungary)

Two-dimensional transition metal dichalcogenide (TMDC) nanoribbons are reported to exhibit interesting properties distinctly different from their 2D analogues, including a change of transport properties depending on the edge structure, enhanced exciton correlation effect and thermoelectric property. In this work we report a successful preparation method for large arrays of 2D TMDC nanoribbons without a template, using a reducing agent aqueous etchant. This approach is a simple and tuneable way for generating TMDC (e.g. MoS₂ and MoSe₂) nanoribbons from CVD grown 2D TMDCs on Si/SiO₂ through liquid phase mechano-chemical reaction. The reducing agent converts Mo(IV) from the defect sites to a lower oxidation state, thus expanding the defects. Water acts as a detaching and tearing medium that pulls the TMDC flake into nanoribbons. The area of conversion, density, and aspect ratio of the nanoribbons can be tuned by concentration and potency of the etchant. The 2D nanoribbons possess high structural integrity, zigzag edges with chalcogen termination, and an increase of bandgap when ribbon width decreases. This method allows a scalable approach for 2D nanoribbons to be prepared for various applications.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1524868

Journal Information:: Nanoscale Horizons, Vol. 4, Issue 3; ISSN 2055-6756

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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