한국분말재료학회지 (Journal of Powder Materials)

  • 제24권1호
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  • Pages.1-5
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  • 2017
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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장시간 안정성을 위한 CdSe/ZnS 양자점의 표면처리 기술

Surface Treatment Method for Long-term Stability of CdSe/ZnS Quantum Dots

  • 박현수 (단국대학교 에너지공학과) ;
  • 정다운 (한국생산기술연구원 한국희소금속산업기술센터) ;
  • 김범성 (한국생산기술연구원 한국희소금속산업기술센터) ;
  • 주소영 (고등기술연구원 신소재공정센터) ;
  • 이찬기 (고등기술연구원 신소재공정센터) ;
  • 김우병 (단국대학교 에너지공학과)
  • Park, Hyun-Su (Department of Energy Engineering, Dankook University) ;
  • Jeong, Da-Woon (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Kim, Bum-Sung (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Joo, So-Yeong (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Lee, Chan-Gi (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Kim, Woo-Byoung (Department of Energy Engineering, Dankook University)
  • 투고 : 2017.01.26
  • 심사 : 2017.02.16
  • 발행 : 2017.02.28
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초록

We have investigated the washing method of as-synthesized CdSe/ZnS core/shell structure quantum dots (QDs) and the effective surface passivation method of the washed QDs using PMMA. The quantum yield (QY%) of as-synthesized QDs decreases with time, from 79.3% to 21.1%, owing to surface reaction with residual organics. The decreased QY% is restored to the QY% of as-synthesized QDs by washing. However, the QY% of washed QDs also decreases with time, owing to the absence of surface passivation layer. On the other hand, the PMMA-treated QDs maintained a relatively higher QY% after washing than that of the washed QDs that were kept in toluene solution for 30 days. Formation of the PMMA coating layer on CdSe/ZnS QD surface is confirmed by HR-TEM and FT-IR. It is found that the PMMA surface coating, when combined with washing, is useful to be applied in the storage of QDs, owing to its long-term stability.

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