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Grant support

The authors would like to thank Emerson Coy (CNBM-AMU) for sharing the HR-TEM images. S V and D S R acknowledge the support of the Spanish Ministry of Economy through FPI-SO 2018 and FPI-SO 2019, respectively. ICN2 was supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706). K J T acknowledges funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 804349 (ERC StG CUHL), RyC Fellowship No. RYC-2017-22330, and IAE Project PID2019-111673GB-I00. A E S, E C A, M S and C M S T acknowledge support of the Spanish MICINN Project SIP (PGC2018-101743-B-I00).

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El Sachat, AlexandrosAuthor

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May 17, 2023
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Fabrication and characterization of large-area suspended MoSe2 crystals down to the monolayer

Publicated to:JOURNAL OF PHYSICS-MATERIALS. 4 (4): - 2021-10-01 4(4), DOI: 10.1088/2515-7639/ac2060

Authors: Varghese, Sebin; Reig, David Saleta; Mehew, Jake Dudley; Block, Alexander; El Sachat, Alexandros; Chavez-Angel, Emigdio; Sledzinska, Marianna; Ballesteros, Belen; Torres, Clivia M. Sotomayor; Tielrooij, Klaas-Jan;

Affiliations

BIST, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain - Author
CSIC, Campus UAB, Barcelona 08193, Spain - Author
ICREA, Pg Lluis Companys 23, Barcelona 08010, Spain - Author

Abstract

Many layered materials, such as graphene and transition metal dichalcogenides, can be exfoliated down to atomic or molecular monolayers. These materials exhibit exciting material properties that can be exploited for several promising device concepts. Thinner materials lead to an increased surface-to-volume ratio, with mono- and bi-layers being basically pure surfaces. Thin crystals containing more than two layers also often behave as an all-surface material, depending on the physical property of interest. As a result, flakes of layered materials are typically highly sensitive to their environment, which is undesirable for a broad range of studies and potential devices. Material systems based on suspended flakes overcome this issue, yet often require complex fabrication procedures. Here, we demonstrate the relatively straightforward fabrication of exfoliated MoSe2 flakes down to the monolayer, suspended over unprecedentedly large holes with a diameter of 15 mu m. We describe our fabrication methods in detail, present characterization measurements of the fabricated structures, and, finally, exploit these suspended flakes for accurate optical absorption measurements.

Keywords

Dry-transferEmissionGrapheneMechanical resonatorsMose2Optical absorptionRamanSuspended flakesThermal-conductivityTransition metal dichalcogenidesTransition-metal dichalcogenidesTransportWs2

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal JOURNAL OF PHYSICS-MATERIALS due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Condensed Matter Physics. Notably, the journal is positioned above the 90th percentile.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 1.47, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Aug 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-08-08, the following number of citations:

  • WoS: 7

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-08-08:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 23.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 23 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 1.85.
  • The number of mentions on the social network X (formerly Twitter): 3 (Altmetric).