장시간 안정성을 위한 CdSe/ZnS 양자점의 표면처리 기술
Surface Treatment Method for Long-term Stability of CdSe/ZnS Quantum Dots
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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 assynthesized 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.
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 assynthesized 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.
참고문헌 (34)
- K. Sun, , Microelectron J., 40, pp.644~ (2009)
- S. Cordero, , J. Phys. Chem. B, 104, pp.12137~ (2000)
- V. Colvin, , Nature, 370, pp.354~ (1994)
- C. B. Murray, , J. Am. Chem. Soc, 115, pp.8706~ (1993)
- I. L. Medintz, , Nat. Mater., 4, pp.435~ (2005)
- W. C. Chan, , Curr. Opin. Biotechnol., 13, pp.40~ (2002)
- Q. Sun, , Nat. Photon., 1, pp.717~ (2007)
- V. Aroutiounian, , J. Appl. Phys., 89, pp.2268~ (2001)
- D. S. English, , Nano Lett, 2, pp.681~ (2002)
- M. A. Hines, , J. Phys. Chem., 100, pp.468~ (1996)
- A. Kortan, , J. Am. Chem. Soc., 112, pp.1327~ (1990)
- M. Danek, , Chem. Mater., 8, pp.173~ (1996)
- P. Reiss, , small, 5, pp.154~ (2009)
- X. Peng, , J. Am. Chem. Soc., 119, pp.7019~ (1997)
- V. V. Breus, , J. Phys. Chem. C, 111, pp.18589~ (2007)
- B. Pong, , Langmuir, 24, pp.5270~ (2008)
- X. Hu, , Electrochim. Acta, 94, pp.367~ (2013)
- W. R. Algar, , ChemPhysChem, 8, pp.561~ (2007)
- D. Liu, , Sensor. Actuator. B: Chem., 186, pp.235~ (2013)
- A. Giri, , Mater. Res. Bull., 47, pp.1912~ (2012)
- C. Carrillo-Carrión, , Anal. Chim. Acta, 792, pp.93~ (2013)
- 양희승, "CuInS2 나노 반도체 합성 및 표면 개질을 통한 광학적 효율 분석 연구", 한국분말야금학회지, 19(3), pp.177~181 (2012), 한국분말야금학회
- D. V. Talapin, , Nano lett., 1, pp.207~ (2001)
- Y. Kwon, , Surf. Coating Tech., 259, pp.83~ (2014)
- 안시현, "Carboxylic acid가 CuInS2", ZnS 반도체 나노입자의 광학적 특성에 미치는 영향, 2012, pp.19(5), 362~366[DOI]
- N. Al-Hosiny, , J. Polym. Res., 20, pp.76~ (2013)
- I. Suárez, , Nanotechnology, 22, pp.435202~ (2011)
- L. Hu, , Nanotechnology, 22, pp.125202~ (2011)
- Y. Kwon, , J. Nanosci. Nanotechnol., 14, pp.7636~ (2014)
- J. M. Haremza, , Nano Lett., 2, pp.1253~ (2002)
- R. M. Santana, , Talanta, 135, pp.27~ (2015)
- J. Lakowicz, "Topics in Fluorescence Spectroscopy", pp.1999, Kluwer Academic
- H. S. Hong, , J. Korean Powder Metall. Inst., 19, pp.451~ (2012)
- A. H. Ip, , Nat. Nano., 7, pp.577~ (2012)