Improved trade-off between thermoelectric performance and mechanical reliability of Mg 2 Si 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

2 Citations (Scopus)

Abstract

Nanocomposites can simultaneously enhance the thermoelectric and mechanical properties of thermoelectric materials. Here, we fabricated bulks of Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 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 m 1/2 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

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Oxides
Graphene
graphene
grinding (comminution)
commercialization
thermoelectric materials
Spark plasma sintering
oxides
crack propagation
sparks
fracture strength
figure of merit
Fracture toughness
deflection
Crack propagation
Nanocomposites
nanocomposites
sintering
ultrasonics

All Science Journal Classification (ASJC) codes

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

Cite this

Kim, Gwansik ; Kim, Sung Wng ; Rim, Hyun Jun ; Lee, Hwijong ; Kim, Jeongmin ; Roh, Jong Wook ; Kim, Byung Wook ; Lee, Kyu Hyoung ; Lee, Wooyoung. / Improved trade-off between thermoelectric performance and mechanical reliability of Mg 2 Si by hybridization of few-layered reduced graphene oxides In: Scripta Materialia. 2019 ; Vol. 162. pp. 402-407.
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Improved trade-off between thermoelectric performance and mechanical reliability of Mg 2 Si by hybridization of few-layered reduced graphene oxides . / Kim, Gwansik; Kim, Sung Wng; Rim, Hyun Jun; Lee, Hwijong; Kim, Jeongmin; Roh, Jong Wook; Kim, Byung Wook; Lee, Kyu Hyoung; Lee, Wooyoung.

In: Scripta Materialia, Vol. 162, 15.03.2019, p. 402-407.

Research output: Contribution to journalArticle

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AU - Kim, Sung Wng

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AU - Lee, Hwijong

AU - Kim, Jeongmin

AU - Roh, Jong Wook

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AU - Lee, Kyu Hyoung

AU - Lee, Wooyoung

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