Improved trade-off between thermoelectric performance and mechanical reliability of Mg2Si by hybridization of few-layered reduced graphene oxides

Gwansik Kim, Sung Wng Kim, Hyun Jun Rim, Hwijong Lee, Jeongmin Kim, Jong Wook Roh, Byung Wook Kim, Kyu Hyoung Lee, Wooyoung Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Nanocomposites can simultaneously enhance the thermoelectric and mechanical properties of thermoelectric materials. Here, we fabricated bulks of Mg1.96Al0.04Si0.97Bi0.03 with monodispersed few-layered reduced graphene oxides utilizing ultrasonic-based wet chemical pulverizing-mixing and spark plasma sintering to improve unfavorable trade-off between thermoelectric performance and mechanical reliability, which is important for commercialization. An unexpected high fracture toughness of ~1.88 MPa m1/2 was observed due to the synergetic effect of the deflection of crack propagation, bridging, and sheet pull-out mechanisms, and a high thermoelectric figure of merit ~0.6 was obtained even for a high content (3 vol.%) of reduced graphene oxides.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalScripta Materialia
Volume162
DOIs
Publication statusPublished - 2019 Mar 15

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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