Contribution of the loss of nanocrystal ligands to interdot coupling in films of small CdSe/1-thioglycerol nanocrystals

被引:42
作者
Kim, DI
Islam, MA
Avila, L
Herman, IP [1 ]
机构
[1] Columbia Univ, Dept Appl Phys & Appl Math, Mat Res Sci & Engn Ctr, New York, NY 10027 USA
[2] Columbia Univ, Dept Chem, New York, NY 10027 USA
关键词
D O I
10.1021/jp030168h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The broadening of the exciton absorption peak in films composed of small, similar to2 nm diameter CdSe nanocrystals capped by 1-thioglycerol has been interpreted as evidence of interdot carrier coupling. This exciton broadening is seen here for 2.1 nm diameter CdSe nanocrystal arrays, and part of it is correlated with the loss of over half of the 1-thioglycerol molecules from the nanocrystal surfaces. These ligands are even more weakly bound in films of 4.1 nm diameter particles, as evidenced by the smaller shift in their similar to2560 cm(-1) S-H stretching peak and the faster decay of this peak vis-a-vis that of the smaller particles, but no exciton broadening is observed for these films.
引用
收藏
页码:6318 / 6323
页数:6
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