Thermoelectric properties of unoxidized graphene/Bi2Te2.7Se0.3 composites synthesized by exfoliation/re-assembly method

Jin Il Kim; Eun Sil Lee; Jong Young Kim; Soon Mok Choi; Kyu Hyoung Lee; Won Seon Seo

doi:10.1002/pssr.201308321

Thermoelectric properties of unoxidized graphene/Bi₂Te_2.7Se_0.3 composites synthesized by exfoliation/re-assembly method

Jin Il Kim, Eun Sil Lee, Jong Young Kim, Soon Mok Choi, Kyu Hyoung Lee, Won Seon Seo

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Nanocomposites of n-type thermoelectric Bi₂Te_2.7Se_0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll-type crystals by chemical exfoliation, and were re-assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark-plasma-sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS-US and UG/BTS-EX composites were ∼0.8 at the UG concentration of 0.05 wt%.

Original language	English
Pages (from-to)	357-361
Number of pages	5
Journal	Physica Status Solidi - Rapid Research Letters
Volume	8
Issue number	4
DOIs	https://doi.org/10.1002/pssr.201308321
Publication status	Published - 2014 Apr

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics

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10.1002/pssr.201308321

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title = "Thermoelectric properties of unoxidized graphene/Bi2Te2.7Se0.3 composites synthesized by exfoliation/re-assembly method",

abstract = "Nanocomposites of n-type thermoelectric Bi2Te2.7Se0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll-type crystals by chemical exfoliation, and were re-assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark-plasma-sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS-US and UG/BTS-EX composites were ∼0.8 at the UG concentration of 0.05 wt%.",

author = "Kim, {Jin Il} and Lee, {Eun Sil} and Kim, {Jong Young} and Choi, {Soon Mok} and Lee, {Kyu Hyoung} and Seo, {Won Seon}",

year = "2014",

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doi = "10.1002/pssr.201308321",

language = "English",

volume = "8",

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T1 - Thermoelectric properties of unoxidized graphene/Bi2Te2.7Se0.3 composites synthesized by exfoliation/re-assembly method

AU - Kim, Jin Il

AU - Lee, Eun Sil

AU - Kim, Jong Young

AU - Choi, Soon Mok

AU - Lee, Kyu Hyoung

AU - Seo, Won Seon

PY - 2014/4

Y1 - 2014/4

N2 - Nanocomposites of n-type thermoelectric Bi2Te2.7Se0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll-type crystals by chemical exfoliation, and were re-assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark-plasma-sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS-US and UG/BTS-EX composites were ∼0.8 at the UG concentration of 0.05 wt%.

AB - Nanocomposites of n-type thermoelectric Bi2Te2.7Se0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll-type crystals by chemical exfoliation, and were re-assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark-plasma-sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS-US and UG/BTS-EX composites were ∼0.8 at the UG concentration of 0.05 wt%.

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Thermoelectric properties of unoxidized graphene/Bi₂Te_2.7Se_0.3 composites synthesized by exfoliation/re-assembly method

Abstract

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