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제111회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Size-dependent shape transition in lead sulfide quantum dots

2013년 2월 14일 16시 48분 59초
ELEC1-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 09시 : 30분
전기화학 - Recent Electrochemistry in Nanoscience Breakthrough (I)
저자 및
최혜경, 김용현1,*, 정소희2,*
과학기술연합대학원대학교(UST) 나노메카트로닉스학과, Korea
1한국과학기술원(KAIST) 나노과학기술대학원, Korea
2한국기계연구원 나노기계연구본부, Korea
PbS nanocrystal quantum dots (NQDs) are very promising for applications in solution- processed photovoltaic device because of their large bulk exciton Bohr radius (20 nm) and size-tunability over the entire near-infrared wavelength region. PbS NQDs, however, have poor air stability for large size PbS NQDs. In this research, we firstly synthesized highly air stable, ultra-small PbS NQDs with diameters as small as 1.5 nm, absorbed at 480 nm using low growth temperature after fast quenching. The PbS NQDs size is controlled from 1.5 to 7.5 nm in diameter. We found a transition at 4 nm in diameter in the air-stability for varying PbS NQDs size. We show this transition is driven by shape transition from octahedron to cuboctahedron due to increasing steric hindrance as large PbS NQDs size using X-ray photoemission spectroscopy (XPS) measurements and density functional theory (DFT) calculations. These studies provide important clues on surface chemistry about air-stability and also can be very useful in the process of designing better stable PbS NQDs under ambient conditions in the future.