Colloid Chemical Approach for Fabricating Cu-Fe-S Nanobulk Thermoelectric Materials by Blending Cu2S and FeS Nanoparticles as Building Blocks

Maninder Singh, Pratibha Dwivedi, Derrick Mott, Koichi Higashimine, Michihiro Ohta, Hiroshi Miwa, Takeo Akatsuka, Shinya Maenosono

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The Cu-Fe-S system consists of earth-abundant low-toxicity elements, and it potentially has good thermoelectric properties. There are many different types of Cu-Fe-S compounds, and some are n-type semiconductors while others are p-type semiconductors. Here, we report a rapid low-cost colloid-chemical method to fabricate Cu-Fe-S thermoelectric materials using Cu2S and FeS nanoparticles as building blocks. The n- and p-type of the Cu-Fe-S nanobulk material can be readily tuned by changing the Cu2S/FeS volume ratio. The nanobulk materials lead to low lattice thermal conductivity ranging from 0.3 to 1.0 W m-1 K-1. By blending Cu2S and FeS nanoparticles at a weight fraction of 9:1, we fabricated a nanocomposite consisting of bornite Cu5FeS4 as the main phase and other minor phases. This nanocomposite has a maximum dimensionless figure of merit (ZT) of 0.55 at 663 K, which is 45% higher than that of pristine Cu5FeS4.

Original languageEnglish
Pages (from-to)3688-3697
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number9
DOIs
Publication statusPublished - 2019 Mar 6
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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