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Chen IJ, Mante PA, Chang CK, et al. Graphene-to-substrate energy transfer through out-of-plane longitudinal acoustic phonons. Nano Lett. 2014;14(3):1317-23doi: 10.1021/nl404297r.
Chen, I. J., Mante, P. A., Chang, C. K., Yang, S. C., Chen, H. Y., Huang, Y. R., Chen, L. C., Chen, K. H., Gusev, V., & Sun, C. K. (2014). Graphene-to-substrate energy transfer through out-of-plane longitudinal acoustic phonons. Nano letters, 14(3), 1317-23. https://doi.org/10.1021/nl404297r
Chen, I-Ju, et al. "Graphene-to-substrate energy transfer through out-of-plane longitudinal acoustic phonons." Nano letters vol. 14,3 (2014): 1317-23. doi: https://doi.org/10.1021/nl404297r
Chen IJ, Mante PA, Chang CK, Yang SC, Chen HY, Huang YR, Chen LC, Chen KH, Gusev V, Sun CK. Graphene-to-substrate energy transfer through out-of-plane longitudinal acoustic phonons. Nano Lett. 2014 Mar 12;14(3):1317-23. doi: 10.1021/nl404297r. Epub 2014 Mar 03. PMID: 24559107.
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Nano Lett. 2014 Mar 12;14(3):1317-23. doi: 10.1021/nl404297r. Epub 2014 Mar 03.

Graphene-to-substrate energy transfer through out-of-plane longitudinal acoustic phonons.

Nano letters

I-Ju Chen, Pierre-Adrien Mante, Cheng-Kai Chang, Szu-Chi Yang, Hui-Yuan Chen, Yu-Ru Huang, Li-Chyong Chen, Kuei-Hsien Chen, Vitalyi Gusev, Chi-Kuang Sun

Affiliations

  1. Department of Electrical Engineering and GraduateInstitute of Photonics and Optoelectronics, ‡Center for Condensed Matter Sciences, National Taiwan University Taipei 10617, Taiwan.

PMID: 24559107 DOI: 10.1021/nl404297r

Abstract

Practically, graphene is often deposited on substrates. Given the major substrate-induced modification of properties and considerable energy transfer at the interface, the graphene-substrate interaction has been widely discussed. However, the proposed mechanisms were restricted to the two-dimensional (2D) plane and interface, while the energy conduction in the third dimension is hardly considered. Herein, we disclose the transfer of energy perpendicular to the interface of the combined system of the 2D graphene and the 3D base. More precisely, our observation of the energy dissipation of optically excited graphene via emitting out-of-plane longitudinal acoustic phonon into the substrate is presented. By applying nanoultrasonic spectroscopy with a piezoelectric nanolayer embedded in the substrate, we found that under photoexcitation by a femtosecond laser pulse graphene can emit longitudinal coherent acoustic phonons (CAPs) with frequencies over 1 THz into the substrate. In addition, the waveform of the CAP pulse infers that the photocarriers and sudden lattice heating in graphene caused modification of graphene-substrate bond and consequently generated longitudinal acoustic phonons in the substrate. The direct observation of this unexplored graphene-to-substrate vertical energy transfer channel can bring new insights into the understanding of the energy dissipation and limited transport properties of supported graphene.

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