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http://dx.doi.org/10.4150/KPMI.2017.24.1.1

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

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)
Publication Information
Journal of Powder Materials / v.24, no.1, 2017 , pp. 1-5 More about this Journal
Abstract
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.
Keywords
Quantum Dots; Long-term stability; CdSe/ZnS; PMMA;
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