Ligand-dependent particle size control of PbSe quantum dots.
Colloidal solutions of monodisperse PbSe quantum dots (QDs) were synthesized by a hot solution chemical method from a reaction mixture of lead oleate and TOPSe (TOP: tri-n-octylphosphine). The synthesis was carried out at a fixed temperature (170 degrees C) and time, while the particle sizes of the PbSe QDs were controlled by using two different kinds of organic ligands with varied chain length. It was seen that the tuning of PbSe QDs are possible by using the proper molar ratio of the co-ligands, such as acetic acid or hexanoic acid, at a fixed reaction temperature and time, verified by TEM and XRD as well as NIR absorption analysis. The effects of different organic acids were studied and the role of additional organic acids might be due to the extent of ligand exchange efficiency between the Pb oleate and acetic/hexanoic acid in the initial stage, which is caused by the steric hindrance effects of the acids.
Baek
In Chan
IC
Advanced Materials Division, Korea Research Institute of Chemical Technology, 100 Jang-Dong, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
Seok
Sang Il
SI
Pramanik
Nimai Chand
NC
Jana
Sunirmal
S
Lim
Mi Ae
MA
Ahn
Boek Yeop
BY
Lee
Chang Jin
CJ
Jeong
Yong Jae
YJ