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Elastic and thermal properties of free-standing molybdenum disulfide membranes measured using ultrafast transient grating spectroscopy

Kim, Taeyong and Ding, Ding and Yim, Jong-Hyuk and Jho, Young-Dahl and Minnich, Austin J. (2017) Elastic and thermal properties of free-standing molybdenum disulfide membranes measured using ultrafast transient grating spectroscopy. APL Materials, 5 (8). Art. No. 086105. ISSN 2166-532X. https://resolver.caltech.edu/CaltechAUTHORS:20170822-070843697

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Abstract

Molybdenum disulfide (MoS_2), a member of transition-metal dichalcogenide family, is of intense interest due to its unique electronic and thermoelectric properties. However, reports of its in-plane thermal conductivity vary due to the difficulty of in-plane thermal conductivity measurements on thin films, and an experimental measurement of the in-plane sound velocity has not been reported. Here, we use time-resolved transient grating spectroscopy to simultaneously measure the in-plane elastic and thermal properties of free-standing MoS_2 membranes at room temperature. We obtain a longitudinal acoustic phonon velocity of 7000 ± 40 m s^(−1) and an in-plane thermal conductivity of 74 ± 21 W m^(−1)K^(−1). Our measurements provide useful insights into the elastic and thermal properties of MoS_2 and demonstrate the capability of transient grating spectroscopy to investigate the in-plane vibrational properties of van der Waals materials that are challenging to characterize with conventional methods.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4999225DOIArticle
http://aip.scitation.org/doi/10.1063/1.4999225PublisherArticle
Additional Information:© 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received 25 April 2017; accepted 2 August 2017; published online 21 August 2017. This work was supported by the “GIST-Caltech Research Collaboration” Project through a grant provided by Gwangju Institute of Science and Technology in 2017. T.K. acknowledges the support by the Jeongsong Cultural Foundation (South Korea). D.D. gratefully acknowledges the support by the Agency for Science, Technology and Research (Singapore). The authors thank Stefan Omelchenko, Dr. Ke Sun, Dr. Hang Zhang, and Dr. Dennis Friedrich for experimental assistance, and Dr. Bo Sun and Andrew B. Robbins for the constructive discussions. The authors also gratefully acknowledge the use of equipment from the Caltech Joint Center for Artificial Photosynthesis (JCAP).
Group:JCAP
Funders:
Funding AgencyGrant Number
GIST-Caltech Research CollaborationUNSPECIFIED
Jeongsong Cultural Foundation (South Korea)UNSPECIFIED
Agency for Science, Technology and Research (A*STAR)UNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20170822-070843697
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170822-070843697
Official Citation:Elastic and thermal properties of free-standing molybdenum disulfide membranes measured using ultrafast transient grating spectroscopy Taeyong Kim, Ding Ding, Jong-Hyuk Yim, Young-Dahl Jho, and Austin J. Minnich APL Materials 5, 086105 (2017); http://doi.org/10.1063/1.4999225
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80663
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Aug 2017 16:15
Last Modified:03 Oct 2019 18:33

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