5 Covalent Assemblies of Metal Nanoparticles—Strategies …
137
Table 5.2 An overview of the DT linker molecules and the distances between S atoms and S −
atoms [25]. DMAAB/DMAAcH/PBDT/cHBDT add abbreviations used in Table 5.1
Ligand
Length (Å)
(E HOMO-LUMO )
7.7
4.0
Bis-mercaptomethylenes
8.2
5.0
14.8
3.5
Bis-acetamidothiols
14.9
4.7
10.7
2.7
Bis-dithiocarbamates
9.6
3.2
Scheme 5.1 A
carboxyl-functionalized
chitosan polymer.
Reproduced with permission
from Ref. [52]
force microscopy (AFM), and scanning electron microscopy (SEM). The catalytic
activity of these composite films was investigated for an organic electron transfer
reaction. The kinetic data obtained suggest that the reaction rates are directly related
to the NP size and porosity of the membrane. The reaction rates were five and six
times higher, respectively, with films of 10 and 40 layers of Au NP (5 nm). Mainly,
the NP located on the film surface are the ones that take part in the reaction, since
the accessibility of the embedded NP decreases as a function of number of layers.
137
Table 5.2 An overview of the DT linker molecules and the distances between S atoms and S −
atoms [25]. DMAAB/DMAAcH/PBDT/cHBDT add abbreviations used in Table 5.1
Ligand
Length (Å)
(E HOMO-LUMO )
7.7
4.0
Bis-mercaptomethylenes
8.2
5.0
14.8
3.5
Bis-acetamidothiols
14.9
4.7
10.7
2.7
Bis-dithiocarbamates
9.6
3.2
Scheme 5.1 A
carboxyl-functionalized
chitosan polymer.
Reproduced with permission
from Ref. [52]
force microscopy (AFM), and scanning electron microscopy (SEM). The catalytic
activity of these composite films was investigated for an organic electron transfer
reaction. The kinetic data obtained suggest that the reaction rates are directly related
to the NP size and porosity of the membrane. The reaction rates were five and six
times higher, respectively, with films of 10 and 40 layers of Au NP (5 nm). Mainly,
the NP located on the film surface are the ones that take part in the reaction, since
the accessibility of the embedded NP decreases as a function of number of layers.