Of special interest with regard to tailoring the ligand shells are reactions that
enable the total replacement of one set of ligands with another [92–96]. These reactions also typically enable the transfer of nanocrystals from one phase to another.
A novel method of thiol-derivatizing hydrosols of metal sols has been developed by
Sarathy et al. [93, 94]. The procedure involves mixing vigorously a hydrosol containing metal particles of the desired size distribution with a toluene solution of
an alkane thiol in the presence of a strong acid or reducing agent. The com(a)
(b)
H=100 Oe
Fig. 4.7. (a) Zero field cooled and field cooled
magnetization curves for FeaAu core–shell
nanocrystals. The blocking temperature is 42 K.
(b) Absorption spectrum showing the Au
surface plasmon, shifted due to capping by Fe.
For comparison, the spectrum of Au hydrosol
is also shown. (reproduced with permission
from [87]).
4 Mesoscopic Assembly and Other Properties of Metal and Semiconductor Nanocrystals
60
enable the total replacement of one set of ligands with another [92–96]. These reactions also typically enable the transfer of nanocrystals from one phase to another.
A novel method of thiol-derivatizing hydrosols of metal sols has been developed by
Sarathy et al. [93, 94]. The procedure involves mixing vigorously a hydrosol containing metal particles of the desired size distribution with a toluene solution of
an alkane thiol in the presence of a strong acid or reducing agent. The com(a)
(b)
H=100 Oe
Fig. 4.7. (a) Zero field cooled and field cooled
magnetization curves for FeaAu core–shell
nanocrystals. The blocking temperature is 42 K.
(b) Absorption spectrum showing the Au
surface plasmon, shifted due to capping by Fe.
For comparison, the spectrum of Au hydrosol
is also shown. (reproduced with permission
from [87]).
4 Mesoscopic Assembly and Other Properties of Metal and Semiconductor Nanocrystals
60