Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Preparation and Growth Mechanism of the Recovered Bi2Te3 Particles with Respect to Surfactants

회수된 Bi2Te3의 계면활성제에 따른 합성 및 성장 거동

  • So, Hyeongsub (Department of Energy Engineering, Dankook University) ;
  • Song, Eunpil (Department of Fusion Chemical Engineering, Hanyang University) ;
  • Choa, Yong-Ho (Department of Fusion Chemical Engineering, Hanyang University) ;
  • Lee, Kun-Jae (Department of Energy Engineering, Dankook University)
  • 소형섭 (단국대학교 에너지공학과) ;
  • 송은필 (한양대학교 융합화학공학과) ;
  • 좌용호 (한양대학교 융합화학공학과) ;
  • 이근재 (단국대학교 에너지공학과)
  • Received : 2017.03.06
  • Accepted : 2017.03.28
  • Published : 2017.04.28
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Abstract

$Bi_2Te_3$ powders are recovered by wet chemical reduction for waste n-type thermoelectric chips, and the recovered particles with different morphologies are prepared using various surfactants such as cetyltrimethylammonium bromide (CTAB), sodium dodecylbenzenesulfonate (SDBS), and ethylenediaminetetraacetic acid (EDTA). When citric acid is added as the surfactant, the shape of the aggregated particles shows no distinctive features. On the other hand, rod-shaped particles are formed in the sample with CTAB, and sheet-like particles are synthesized with the addition of SDBS. Further, particles with a tripod shape are observed when EDTA is added as the surfactant. The growth mechanism of the particle shapes depending on the surfactant is investigated, with a focus on the nucleation and growth phenomena. These results help to elucidate the intrinsic formation mechanism of the rod, plate, and tripod structures of the $Bi_2Te_3$ recovered by the wet reduction process.

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References

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