10.1021/ja044593f.s001
Jung Ho Yu
Jung Ho
Yu
Jin Joo
Jin
Joo
Hyun Min Park
Hyun Min
Park
Sung-Il Baik
Sung-Il
Baik
Young Woon Kim
Young Woon
Kim
Sung Chul Kim
Sung Chul
Kim
Taeghwan Hyeon
Taeghwan
Hyeon
Synthesis of Quantum-Sized Cubic ZnS Nanorods by the
Oriented Attachment Mechanism
American Chemical Society
2005
zinc blende
wurtzite crystal structures
zinc blende structure
UV absorption spectra
excitonic emission feature
ZnS nanorods
rod shapes
photoluminescence excitation spectra
TEM
nanocrystal
photoluminescence spectra
particle size distribution
Structural characterizations
reaction mixtures
reaction studies
24 h
quantum confinement effect
oleic acid
2005-04-20 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Quantum_Sized_Cubic_ZnS_Nanorods_by_the_Oriented_Attachment_Mechanism/3290257
Quantum-sized ZnS nanocrystals with quasi-spherical and rod shapes were synthesized by the
aging reaction mixtures containing diethylzinc, sulfur, and amine. Uniform-sized ZnS nanorods with the
average dimension of 5 nm × 21 nm, along with a small fraction of 5 nm-sized quasi-spherical nanocrystals,
were synthesized by adding diethylzinc to a solution containing sulfur and hexadecylamine at 125 °C,
followed by aging at 300 °C. Subsequent secondary aging of the nanocrystals in oleylamine at 60 °C for
24 h produced nearly pure nanorods. Structural characterizations showed that these nanorods had a cubic
zinc blende structure, whereas the fabrication of nanorods with this structure has been known to be difficult
to achieve via colloidal chemical synthetic routes. High-resolution TEM images and reaction studies
demonstrated that these nanorods are formed from the oriented attachment of quasi-spherical nanocrystals.
Monodisperse 5 nm-sized quasi-spherical ZnS nanocrystals were separately synthesized by adding
diethylzinc to sulfur dissolved in a mixture of hexadecylamine and 1-octadecene at 45 °C, followed by
aging at 300 °C. When oleic acid was substituted for hexadecylamine and all other procedures were
unchanged, we obtained 10 nm-sized quasi-spherical ZnS nanocrystals, but with broad particle size
distribution. These two different-sized quasi-spherical ZnS nanocrystals showed different proportions of
zinc blende and wurtzite crystal structures. The UV absorption spectra and photoluminescence excitation
spectra of the 5 nm ZnS quasi-spherical nanocrystals and of the nanorods showed a blue-shift from the
bulk band-gap, thus showing a quantum confinement effect. The photoluminescence spectra of the ZnS
nanorods and quasi-spherical nanocrystals showed a well-defined excitonic emission feature and size-
and shape-dependent quantum confinement effects.